nodeModifyTable.c File Reference

#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "access/tableam.h"
#include "access/xact.h"
#include "catalog/catalog.h"
#include "commands/trigger.h"
#include "executor/execPartition.h"
#include "executor/executor.h"
#include "executor/nodeModifyTable.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "rewrite/rewriteHandler.h"
#include "storage/bufmgr.h"
#include "storage/lmgr.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/memutils.h"
#include "utils/rel.h"

Include dependency graph for nodeModifyTable.c:

Go to the source code of this file.

Data Structures
struct	MTTargetRelLookup
struct	ModifyTableContext
struct	UpdateContext

Macros
#define	MT_NRELS_HASH   64

Typedefs
typedef struct MTTargetRelLookup	MTTargetRelLookup
typedef struct ModifyTableContext	ModifyTableContext
typedef struct UpdateContext	UpdateContext

Functions
static void	ExecBatchInsert (ModifyTableState *mtstate, ResultRelInfo *resultRelInfo, TupleTableSlot **slots, TupleTableSlot **planSlots, int numSlots, EState *estate, bool canSetTag)
static void	ExecPendingInserts (EState *estate)
static void	ExecCrossPartitionUpdateForeignKey (ModifyTableContext *context, ResultRelInfo *sourcePartInfo, ResultRelInfo *destPartInfo, ItemPointer tupleid, TupleTableSlot *oldslot, TupleTableSlot *newslot)
static bool	ExecOnConflictUpdate (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer conflictTid, TupleTableSlot *excludedSlot, bool canSetTag, TupleTableSlot **returning)
static TupleTableSlot *	ExecPrepareTupleRouting (ModifyTableState *mtstate, EState *estate, PartitionTupleRouting *proute, ResultRelInfo *targetRelInfo, TupleTableSlot *slot, ResultRelInfo **partRelInfo)
static TupleTableSlot *	internalGetUpdateNewTuple (ResultRelInfo *relinfo, TupleTableSlot *planSlot, TupleTableSlot *oldSlot, MergeActionState *relaction)
static TupleTableSlot *	ExecMerge (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, bool canSetTag)
static void	ExecInitMerge (ModifyTableState *mtstate, EState *estate)
static bool	ExecMergeMatched (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, bool canSetTag)
static void	ExecMergeNotMatched (ModifyTableContext *context, ResultRelInfo *resultRelInfo, bool canSetTag)
static TupleTableSlot *	mergeGetUpdateNewTuple (ResultRelInfo *relinfo, TupleTableSlot *planSlot, TupleTableSlot *oldSlot, MergeActionState *relaction)
static void	ExecCheckPlanOutput (Relation resultRel, List *targetList)
static TupleTableSlot *	ExecProcessReturning (ResultRelInfo *resultRelInfo, TupleTableSlot *tupleSlot, TupleTableSlot *planSlot)
static void	ExecCheckTupleVisible (EState *estate, Relation rel, TupleTableSlot *slot)
static void	ExecCheckTIDVisible (EState *estate, ResultRelInfo *relinfo, ItemPointer tid, TupleTableSlot *tempSlot)
void	ExecComputeStoredGenerated (ResultRelInfo *resultRelInfo, EState *estate, TupleTableSlot *slot, CmdType cmdtype)
static void	ExecInitInsertProjection (ModifyTableState *mtstate, ResultRelInfo *resultRelInfo)
static void	ExecInitUpdateProjection (ModifyTableState *mtstate, ResultRelInfo *resultRelInfo)
static TupleTableSlot *	ExecGetInsertNewTuple (ResultRelInfo *relinfo, TupleTableSlot *planSlot)
TupleTableSlot *	ExecGetUpdateNewTuple (ResultRelInfo *relinfo, TupleTableSlot *planSlot, TupleTableSlot *oldSlot)
static TupleTableSlot *	ExecInsert (ModifyTableContext *context, ResultRelInfo *resultRelInfo, TupleTableSlot *slot, bool canSetTag, TupleTableSlot **inserted_tuple, ResultRelInfo **insert_destrel)
static bool	ExecDeletePrologue (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot **epqreturnslot)
static TM_Result	ExecDeleteAct (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, bool changingPart)
static void	ExecDeleteEpilogue (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, bool changingPart)
static TupleTableSlot *	ExecDelete (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, bool processReturning, bool changingPart, bool canSetTag, bool *tupleDeleted, TupleTableSlot **epqreturnslot)
static bool	ExecCrossPartitionUpdate (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot, bool canSetTag, UpdateContext *updateCxt, TupleTableSlot **inserted_tuple, ResultRelInfo **insert_destrel)
static bool	ExecUpdatePrologue (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot)
static void	ExecUpdatePrepareSlot (ResultRelInfo *resultRelInfo, TupleTableSlot *slot, EState *estate)
static TM_Result	ExecUpdateAct (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot, bool canSetTag, UpdateContext *updateCxt)
static void	ExecUpdateEpilogue (ModifyTableContext *context, UpdateContext *updateCxt, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot, List *recheckIndexes)
static TupleTableSlot *	ExecUpdate (ModifyTableContext *context, ResultRelInfo *resultRelInfo, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot *slot, bool canSetTag)
void	ExecInitMergeTupleSlots (ModifyTableState *mtstate, ResultRelInfo *resultRelInfo)
static void	fireBSTriggers (ModifyTableState *node)
static void	fireASTriggers (ModifyTableState *node)
static void	ExecSetupTransitionCaptureState (ModifyTableState *mtstate, EState *estate)
static TupleTableSlot *	ExecModifyTable (PlanState *pstate)
ResultRelInfo *	ExecLookupResultRelByOid (ModifyTableState *node, Oid resultoid, bool missing_ok, bool update_cache)
ModifyTableState *	ExecInitModifyTable (ModifyTable *node, EState *estate, int eflags)
void	ExecEndModifyTable (ModifyTableState *node)
void	ExecReScanModifyTable (ModifyTableState *node)

Macro Definition Documentation

MT_NRELS_HASH

#define MT_NRELS_HASH   64

Typedef Documentation

ModifyTableContext

typedef struct ModifyTableContext ModifyTableContext

MTTargetRelLookup

typedef struct MTTargetRelLookup MTTargetRelLookup

UpdateContext

typedef struct UpdateContext UpdateContext

Function Documentation

ExecBatchInsert()

static void ExecBatchInsert ( ModifyTableState *  mtstate, ResultRelInfo *  resultRelInfo, TupleTableSlot **  slots, TupleTableSlot **  planSlots, int  numSlots, EState *  estate, bool  canSetTag  )

static

Definition at line 1168 of file nodeModifyTable.c.

{
    int         i;
    int         numInserted = numSlots;
    TupleTableSlot *slot = NULL;
    TupleTableSlot **rslots;
 
    /*
     * insert into foreign table: let the FDW do it
     */
    rslots = resultRelInfo->ri_FdwRoutine->ExecForeignBatchInsert(estate,
                                                                  resultRelInfo,
                                                                  slots,
                                                                  planSlots,
                                                                  &numInserted);
 
    for (i = 0; i < numInserted; i++)
    {
        slot = rslots[i];
 
        /*
         * AFTER ROW Triggers might reference the tableoid column, so
         * (re-)initialize tts_tableOid before evaluating them.
         */
        slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
 
        /* AFTER ROW INSERT Triggers */
        ExecARInsertTriggers(estate, resultRelInfo, slot, NIL,
                             mtstate->mt_transition_capture);
 
        /*
         * Check any WITH CHECK OPTION constraints from parent views.  See the
         * comment in ExecInsert.
         */
        if (resultRelInfo->ri_WithCheckOptions != NIL)
            ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo, slot, estate);
    }
 
    if (canSetTag && numInserted > 0)
        estate->es_processed += numInserted;
}

References EState::es_processed, ExecARInsertTriggers(), FdwRoutine::ExecForeignBatchInsert, ExecWithCheckOptions(), i, ModifyTableState::mt_transition_capture, NIL, RelationGetRelid, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_WithCheckOptions, TupleTableSlot::tts_tableOid, and WCO_VIEW_CHECK.

Referenced by ExecInsert(), and ExecPendingInserts().

ExecCheckPlanOutput()

static void ExecCheckPlanOutput ( Relation  resultRel, List *  targetList  )

static

Definition at line 203 of file nodeModifyTable.c.

{
    TupleDesc   resultDesc = RelationGetDescr(resultRel);
    int         attno = 0;
    ListCell   *lc;
 
    foreach(lc, targetList)
    {
        TargetEntry *tle = (TargetEntry *) lfirst(lc);
        Form_pg_attribute attr;
 
        Assert(!tle->resjunk);  /* caller removed junk items already */
 
        if (attno >= resultDesc->natts)
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("table row type and query-specified row type do not match"),
                     errdetail("Query has too many columns.")));
        attr = TupleDescAttr(resultDesc, attno);
        attno++;
 
        if (!attr->attisdropped)
        {
            /* Normal case: demand type match */
            if (exprType((Node *) tle->expr) != attr->atttypid)
                ereport(ERROR,
                        (errcode(ERRCODE_DATATYPE_MISMATCH),
                         errmsg("table row type and query-specified row type do not match"),
                         errdetail("Table has type %s at ordinal position %d, but query expects %s.",
                                   format_type_be(attr->atttypid),
                                   attno,
                                   format_type_be(exprType((Node *) tle->expr)))));
        }
        else
        {
            /*
             * For a dropped column, we can't check atttypid (it's likely 0).
             * In any case the planner has most likely inserted an INT4 null.
             * What we insist on is just *some* NULL constant.
             */
            if (!IsA(tle->expr, Const) ||
                !((Const *) tle->expr)->constisnull)
                ereport(ERROR,
                        (errcode(ERRCODE_DATATYPE_MISMATCH),
                         errmsg("table row type and query-specified row type do not match"),
                         errdetail("Query provides a value for a dropped column at ordinal position %d.",
                                   attno)));
        }
    }
    if (attno != resultDesc->natts)
        ereport(ERROR,
                (errcode(ERRCODE_DATATYPE_MISMATCH),
                 errmsg("table row type and query-specified row type do not match"),
                 errdetail("Query has too few columns.")));
}

References Assert(), ereport, errcode(), errdetail(), errmsg(), ERROR, TargetEntry::expr, exprType(), format_type_be(), IsA, lfirst, TupleDescData::natts, RelationGetDescr, TargetEntry::resjunk, and TupleDescAttr.

Referenced by ExecInitInsertProjection(), and ExecInitMerge().

ExecCheckTIDVisible()

static void ExecCheckTIDVisible ( EState *  estate, ResultRelInfo *  relinfo, ItemPointer  tid, TupleTableSlot *  tempSlot  )

static

Definition at line 338 of file nodeModifyTable.c.

{
    Relation    rel = relinfo->ri_RelationDesc;
 
    /* Redundantly check isolation level */
    if (!IsolationUsesXactSnapshot())
        return;
 
    if (!table_tuple_fetch_row_version(rel, tid, SnapshotAny, tempSlot))
        elog(ERROR, "failed to fetch conflicting tuple for ON CONFLICT");
    ExecCheckTupleVisible(estate, rel, tempSlot);
    ExecClearTuple(tempSlot);
}

References elog(), ERROR, ExecCheckTupleVisible(), ExecClearTuple(), IsolationUsesXactSnapshot, ResultRelInfo::ri_RelationDesc, SnapshotAny, and table_tuple_fetch_row_version().

Referenced by ExecInsert().

ExecCheckTupleVisible()

static void ExecCheckTupleVisible ( EState *  estate, Relation  rel, TupleTableSlot *  slot  )

static

Definition at line 304 of file nodeModifyTable.c.

{
    if (!IsolationUsesXactSnapshot())
        return;
 
    if (!table_tuple_satisfies_snapshot(rel, slot, estate->es_snapshot))
    {
        Datum       xminDatum;
        TransactionId xmin;
        bool        isnull;
 
        xminDatum = slot_getsysattr(slot, MinTransactionIdAttributeNumber, &isnull);
        Assert(!isnull);
        xmin = DatumGetTransactionId(xminDatum);
 
        /*
         * We should not raise a serialization failure if the conflict is
         * against a tuple inserted by our own transaction, even if it's not
         * visible to our snapshot.  (This would happen, for example, if
         * conflicting keys are proposed for insertion in a single command.)
         */
        if (!TransactionIdIsCurrentTransactionId(xmin))
            ereport(ERROR,
                    (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                     errmsg("could not serialize access due to concurrent update")));
    }
}

References Assert(), DatumGetTransactionId(), ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errmsg(), ERROR, EState::es_snapshot, IsolationUsesXactSnapshot, MinTransactionIdAttributeNumber, slot_getsysattr(), table_tuple_satisfies_snapshot(), and TransactionIdIsCurrentTransactionId().

Referenced by ExecCheckTIDVisible(), and ExecOnConflictUpdate().

ExecComputeStoredGenerated()

void ExecComputeStoredGenerated	(	ResultRelInfo *	resultRelInfo,
		EState *	estate,
		TupleTableSlot *	slot,
		CmdType	cmdtype
	)

Definition at line 359 of file nodeModifyTable.c.

{
    Relation    rel = resultRelInfo->ri_RelationDesc;
    TupleDesc   tupdesc = RelationGetDescr(rel);
    int         natts = tupdesc->natts;
    MemoryContext oldContext;
    Datum      *values;
    bool       *nulls;
 
    Assert(tupdesc->constr && tupdesc->constr->has_generated_stored);
 
    /*
     * If first time through for this result relation, build expression
     * nodetrees for rel's stored generation expressions.  Keep them in the
     * per-query memory context so they'll survive throughout the query.
     */
    if (resultRelInfo->ri_GeneratedExprs == NULL)
    {
        oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
 
        resultRelInfo->ri_GeneratedExprs =
            (ExprState **) palloc(natts * sizeof(ExprState *));
        resultRelInfo->ri_NumGeneratedNeeded = 0;
 
        for (int i = 0; i < natts; i++)
        {
            if (TupleDescAttr(tupdesc, i)->attgenerated == ATTRIBUTE_GENERATED_STORED)
            {
                Expr       *expr;
 
                /*
                 * If it's an update and the current column was not marked as
                 * being updated, then we can skip the computation.  But if
                 * there is a BEFORE ROW UPDATE trigger, we cannot skip
                 * because the trigger might affect additional columns.
                 */
                if (cmdtype == CMD_UPDATE &&
                    !(rel->trigdesc && rel->trigdesc->trig_update_before_row) &&
                    !bms_is_member(i + 1 - FirstLowInvalidHeapAttributeNumber,
                                   ExecGetExtraUpdatedCols(resultRelInfo, estate)))
                {
                    resultRelInfo->ri_GeneratedExprs[i] = NULL;
                    continue;
                }
 
                expr = (Expr *) build_column_default(rel, i + 1);
                if (expr == NULL)
                    elog(ERROR, "no generation expression found for column number %d of table \"%s\"",
                         i + 1, RelationGetRelationName(rel));
 
                resultRelInfo->ri_GeneratedExprs[i] = ExecPrepareExpr(expr, estate);
                resultRelInfo->ri_NumGeneratedNeeded++;
            }
        }
 
        MemoryContextSwitchTo(oldContext);
    }
 
    /*
     * If no generated columns have been affected by this change, then skip
     * the rest.
     */
    if (resultRelInfo->ri_NumGeneratedNeeded == 0)
        return;
 
    oldContext = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
 
    values = palloc(sizeof(*values) * natts);
    nulls = palloc(sizeof(*nulls) * natts);
 
    slot_getallattrs(slot);
    memcpy(nulls, slot->tts_isnull, sizeof(*nulls) * natts);
 
    for (int i = 0; i < natts; i++)
    {
        Form_pg_attribute attr = TupleDescAttr(tupdesc, i);
 
        if (attr->attgenerated == ATTRIBUTE_GENERATED_STORED &&
            resultRelInfo->ri_GeneratedExprs[i])
        {
            ExprContext *econtext;
            Datum       val;
            bool        isnull;
 
            econtext = GetPerTupleExprContext(estate);
            econtext->ecxt_scantuple = slot;
 
            val = ExecEvalExpr(resultRelInfo->ri_GeneratedExprs[i], econtext, &isnull);
 
            /*
             * We must make a copy of val as we have no guarantees about where
             * memory for a pass-by-reference Datum is located.
             */
            if (!isnull)
                val = datumCopy(val, attr->attbyval, attr->attlen);
 
            values[i] = val;
            nulls[i] = isnull;
        }
        else
        {
            if (!nulls[i])
                values[i] = datumCopy(slot->tts_values[i], attr->attbyval, attr->attlen);
        }
    }
 
    ExecClearTuple(slot);
    memcpy(slot->tts_values, values, sizeof(*values) * natts);
    memcpy(slot->tts_isnull, nulls, sizeof(*nulls) * natts);
    ExecStoreVirtualTuple(slot);
    ExecMaterializeSlot(slot);
 
    MemoryContextSwitchTo(oldContext);
}

References Assert(), bms_is_member(), build_column_default(), CMD_UPDATE, TupleDescData::constr, datumCopy(), ExprContext::ecxt_scantuple, elog(), ERROR, EState::es_query_cxt, ExecClearTuple(), ExecEvalExpr(), ExecGetExtraUpdatedCols(), ExecMaterializeSlot(), ExecPrepareExpr(), ExecStoreVirtualTuple(), FirstLowInvalidHeapAttributeNumber, GetPerTupleExprContext, GetPerTupleMemoryContext, TupleConstr::has_generated_stored, i, MemoryContextSwitchTo(), TupleDescData::natts, palloc(), RelationGetDescr, RelationGetRelationName, ResultRelInfo::ri_GeneratedExprs, ResultRelInfo::ri_NumGeneratedNeeded, ResultRelInfo::ri_RelationDesc, slot_getallattrs(), TriggerDesc::trig_update_before_row, RelationData::trigdesc, TupleTableSlot::tts_isnull, TupleTableSlot::tts_values, TupleDescAttr, val, and values.

Referenced by CopyFrom(), ExecInsert(), ExecSimpleRelationInsert(), ExecSimpleRelationUpdate(), and ExecUpdatePrepareSlot().

ExecCrossPartitionUpdate()

static bool ExecCrossPartitionUpdate ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot *  slot, bool  canSetTag, UpdateContext *  updateCxt, TupleTableSlot **  inserted_tuple, ResultRelInfo **  insert_destrel  )

static

Definition at line 1666 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    EState     *estate = mtstate->ps.state;
    TupleConversionMap *tupconv_map;
    bool        tuple_deleted;
    TupleTableSlot *epqslot = NULL;
 
    context->cpUpdateReturningSlot = NULL;
    context->cpUpdateRetrySlot = NULL;
 
    /*
     * Disallow an INSERT ON CONFLICT DO UPDATE that causes the original row
     * to migrate to a different partition.  Maybe this can be implemented
     * some day, but it seems a fringe feature with little redeeming value.
     */
    if (((ModifyTable *) mtstate->ps.plan)->onConflictAction == ONCONFLICT_UPDATE)
        ereport(ERROR,
                (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                 errmsg("invalid ON UPDATE specification"),
                 errdetail("The result tuple would appear in a different partition than the original tuple.")));
 
    /*
     * When an UPDATE is run directly on a leaf partition, simply fail with a
     * partition constraint violation error.
     */
    if (resultRelInfo == mtstate->rootResultRelInfo)
        ExecPartitionCheckEmitError(resultRelInfo, slot, estate);
 
    /* Initialize tuple routing info if not already done. */
    if (mtstate->mt_partition_tuple_routing == NULL)
    {
        Relation    rootRel = mtstate->rootResultRelInfo->ri_RelationDesc;
        MemoryContext oldcxt;
 
        /* Things built here have to last for the query duration. */
        oldcxt = MemoryContextSwitchTo(estate->es_query_cxt);
 
        mtstate->mt_partition_tuple_routing =
            ExecSetupPartitionTupleRouting(estate, rootRel);
 
        /*
         * Before a partition's tuple can be re-routed, it must first be
         * converted to the root's format, so we'll need a slot for storing
         * such tuples.
         */
        Assert(mtstate->mt_root_tuple_slot == NULL);
        mtstate->mt_root_tuple_slot = table_slot_create(rootRel, NULL);
 
        MemoryContextSwitchTo(oldcxt);
    }
 
    /*
     * Row movement, part 1.  Delete the tuple, but skip RETURNING processing.
     * We want to return rows from INSERT.
     */
    ExecDelete(context, resultRelInfo,
               tupleid, oldtuple,
               false,           /* processReturning */
               true,            /* changingPart */
               false,           /* canSetTag */
               &tuple_deleted, &epqslot);
 
    /*
     * For some reason if DELETE didn't happen (e.g. trigger prevented it, or
     * it was already deleted by self, or it was concurrently deleted by
     * another transaction), then we should skip the insert as well;
     * otherwise, an UPDATE could cause an increase in the total number of
     * rows across all partitions, which is clearly wrong.
     *
     * For a normal UPDATE, the case where the tuple has been the subject of a
     * concurrent UPDATE or DELETE would be handled by the EvalPlanQual
     * machinery, but for an UPDATE that we've translated into a DELETE from
     * this partition and an INSERT into some other partition, that's not
     * available, because CTID chains can't span relation boundaries.  We
     * mimic the semantics to a limited extent by skipping the INSERT if the
     * DELETE fails to find a tuple.  This ensures that two concurrent
     * attempts to UPDATE the same tuple at the same time can't turn one tuple
     * into two, and that an UPDATE of a just-deleted tuple can't resurrect
     * it.
     */
    if (!tuple_deleted)
    {
        /*
         * epqslot will be typically NULL.  But when ExecDelete() finds that
         * another transaction has concurrently updated the same row, it
         * re-fetches the row, skips the delete, and epqslot is set to the
         * re-fetched tuple slot.  In that case, we need to do all the checks
         * again.
         */
        if (TupIsNull(epqslot))
            return true;
        else
        {
            /* Fetch the most recent version of old tuple. */
            TupleTableSlot *oldSlot;
 
            /* ... but first, make sure ri_oldTupleSlot is initialized. */
            if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
                ExecInitUpdateProjection(mtstate, resultRelInfo);
            oldSlot = resultRelInfo->ri_oldTupleSlot;
            if (!table_tuple_fetch_row_version(resultRelInfo->ri_RelationDesc,
                                               tupleid,
                                               SnapshotAny,
                                               oldSlot))
                elog(ERROR, "failed to fetch tuple being updated");
            /* and project the new tuple to retry the UPDATE with */
            context->cpUpdateRetrySlot =
                context->GetUpdateNewTuple(resultRelInfo, epqslot, oldSlot,
                                           context->relaction);
            return false;
        }
    }
 
    /*
     * resultRelInfo is one of the per-relation resultRelInfos.  So we should
     * convert the tuple into root's tuple descriptor if needed, since
     * ExecInsert() starts the search from root.
     */
    tupconv_map = ExecGetChildToRootMap(resultRelInfo);
    if (tupconv_map != NULL)
        slot = execute_attr_map_slot(tupconv_map->attrMap,
                                     slot,
                                     mtstate->mt_root_tuple_slot);
 
    /* Tuple routing starts from the root table. */
    context->cpUpdateReturningSlot =
        ExecInsert(context, mtstate->rootResultRelInfo, slot, canSetTag,
                   inserted_tuple, insert_destrel);
 
    /*
     * Reset the transition state that may possibly have been written by
     * INSERT.
     */
    if (mtstate->mt_transition_capture)
        mtstate->mt_transition_capture->tcs_original_insert_tuple = NULL;
 
    /* We're done moving. */
    return true;
}

References Assert(), TupleConversionMap::attrMap, ModifyTableContext::cpUpdateRetrySlot, ModifyTableContext::cpUpdateReturningSlot, elog(), ereport, errcode(), errdetail(), errmsg(), ERROR, EState::es_query_cxt, ExecDelete(), ExecGetChildToRootMap(), ExecInitUpdateProjection(), ExecInsert(), ExecPartitionCheckEmitError(), ExecSetupPartitionTupleRouting(), execute_attr_map_slot(), ModifyTableContext::GetUpdateNewTuple, MemoryContextSwitchTo(), ModifyTableState::mt_partition_tuple_routing, ModifyTableState::mt_root_tuple_slot, ModifyTableState::mt_transition_capture, ModifyTableContext::mtstate, ONCONFLICT_UPDATE, PlanState::plan, ModifyTableState::ps, ModifyTableContext::relaction, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_RelationDesc, ModifyTableState::rootResultRelInfo, SnapshotAny, PlanState::state, table_slot_create(), table_tuple_fetch_row_version(), TransitionCaptureState::tcs_original_insert_tuple, TupIsNull, and unlikely.

Referenced by ExecUpdateAct().

ExecCrossPartitionUpdateForeignKey()

static void ExecCrossPartitionUpdateForeignKey ( ModifyTableContext *  context, ResultRelInfo *  sourcePartInfo, ResultRelInfo *  destPartInfo, ItemPointer  tupleid, TupleTableSlot *  oldslot, TupleTableSlot *  newslot  )

static

Definition at line 2091 of file nodeModifyTable.c.

{
    ListCell   *lc;
    ResultRelInfo *rootRelInfo;
    List       *ancestorRels;
 
    rootRelInfo = sourcePartInfo->ri_RootResultRelInfo;
    ancestorRels = ExecGetAncestorResultRels(context->estate, sourcePartInfo);
 
    /*
     * For any foreign keys that point directly into a non-root ancestors of
     * the source partition, we can in theory fire an update event to enforce
     * those constraints using their triggers, if we could tell that both the
     * source and the destination partitions are under the same ancestor. But
     * for now, we simply report an error that those cannot be enforced.
     */
    foreach(lc, ancestorRels)
    {
        ResultRelInfo *rInfo = lfirst(lc);
        TriggerDesc *trigdesc = rInfo->ri_TrigDesc;
        bool        has_noncloned_fkey = false;
 
        /* Root ancestor's triggers will be processed. */
        if (rInfo == rootRelInfo)
            continue;
 
        if (trigdesc && trigdesc->trig_update_after_row)
        {
            for (int i = 0; i < trigdesc->numtriggers; i++)
            {
                Trigger    *trig = &trigdesc->triggers[i];
 
                if (!trig->tgisclone &&
                    RI_FKey_trigger_type(trig->tgfoid) == RI_TRIGGER_PK)
                {
                    has_noncloned_fkey = true;
                    break;
                }
            }
        }
 
        if (has_noncloned_fkey)
            ereport(ERROR,
                    (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                     errmsg("cannot move tuple across partitions when a non-root ancestor of the source partition is directly referenced in a foreign key"),
                     errdetail("A foreign key points to ancestor \"%s\" but not the root ancestor \"%s\".",
                               RelationGetRelationName(rInfo->ri_RelationDesc),
                               RelationGetRelationName(rootRelInfo->ri_RelationDesc)),
                     errhint("Consider defining the foreign key on table \"%s\".",
                             RelationGetRelationName(rootRelInfo->ri_RelationDesc))));
    }
 
    /* Perform the root table's triggers. */
    ExecARUpdateTriggers(context->estate,
                         rootRelInfo, sourcePartInfo, destPartInfo,
                         tupleid, NULL, newslot, NIL, NULL, true);
}

References ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, ModifyTableContext::estate, ExecARUpdateTriggers(), ExecGetAncestorResultRels(), i, lfirst, NIL, TriggerDesc::numtriggers, RelationGetRelationName, RI_FKey_trigger_type(), ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_RootResultRelInfo, ResultRelInfo::ri_TrigDesc, RI_TRIGGER_PK, Trigger::tgfoid, Trigger::tgisclone, TriggerDesc::trig_update_after_row, and TriggerDesc::triggers.

Referenced by ExecUpdateAct().

ExecDelete()

static TupleTableSlot* ExecDelete ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, bool  processReturning, bool  changingPart, bool  canSetTag, bool *  tupleDeleted, TupleTableSlot **  epqreturnslot  )

static

Definition at line 1358 of file nodeModifyTable.c.

{
    EState     *estate = context->estate;
    Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    TupleTableSlot *slot = NULL;
    TM_Result   result;
 
    if (tupleDeleted)
        *tupleDeleted = false;
 
    /*
     * Prepare for the delete.  This includes BEFORE ROW triggers, so we're
     * done if it says we are.
     */
    if (!ExecDeletePrologue(context, resultRelInfo, tupleid, oldtuple,
                            epqreturnslot))
        return NULL;
 
    /* INSTEAD OF ROW DELETE Triggers */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_delete_instead_row)
    {
        bool        dodelete;
 
        Assert(oldtuple != NULL);
        dodelete = ExecIRDeleteTriggers(estate, resultRelInfo, oldtuple);
 
        if (!dodelete)          /* "do nothing" */
            return NULL;
    }
    else if (resultRelInfo->ri_FdwRoutine)
    {
        /*
         * delete from foreign table: let the FDW do it
         *
         * We offer the returning slot as a place to store RETURNING data,
         * although the FDW can return some other slot if it wants.
         */
        slot = ExecGetReturningSlot(estate, resultRelInfo);
        slot = resultRelInfo->ri_FdwRoutine->ExecForeignDelete(estate,
                                                               resultRelInfo,
                                                               slot,
                                                               context->planSlot);
 
        if (slot == NULL)       /* "do nothing" */
            return NULL;
 
        /*
         * RETURNING expressions might reference the tableoid column, so
         * (re)initialize tts_tableOid before evaluating them.
         */
        if (TTS_EMPTY(slot))
            ExecStoreAllNullTuple(slot);
 
        slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    }
    else
    {
        /*
         * delete the tuple
         *
         * Note: if context->estate->es_crosscheck_snapshot isn't
         * InvalidSnapshot, we check that the row to be deleted is visible to
         * that snapshot, and throw a can't-serialize error if not. This is a
         * special-case behavior needed for referential integrity updates in
         * transaction-snapshot mode transactions.
         */
ldelete:
        result = ExecDeleteAct(context, resultRelInfo, tupleid, changingPart);
 
        switch (result)
        {
            case TM_SelfModified:
 
                /*
                 * The target tuple was already updated or deleted by the
                 * current command, or by a later command in the current
                 * transaction.  The former case is possible in a join DELETE
                 * where multiple tuples join to the same target tuple. This
                 * is somewhat questionable, but Postgres has always allowed
                 * it: we just ignore additional deletion attempts.
                 *
                 * The latter case arises if the tuple is modified by a
                 * command in a BEFORE trigger, or perhaps by a command in a
                 * volatile function used in the query.  In such situations we
                 * should not ignore the deletion, but it is equally unsafe to
                 * proceed.  We don't want to discard the original DELETE
                 * while keeping the triggered actions based on its deletion;
                 * and it would be no better to allow the original DELETE
                 * while discarding updates that it triggered.  The row update
                 * carries some information that might be important according
                 * to business rules; so throwing an error is the only safe
                 * course.
                 *
                 * If a trigger actually intends this type of interaction, it
                 * can re-execute the DELETE and then return NULL to cancel
                 * the outer delete.
                 */
                if (context->tmfd.cmax != estate->es_output_cid)
                    ereport(ERROR,
                            (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
                             errmsg("tuple to be deleted was already modified by an operation triggered by the current command"),
                             errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
 
                /* Else, already deleted by self; nothing to do */
                return NULL;
 
            case TM_Ok:
                break;
 
            case TM_Updated:
                {
                    TupleTableSlot *inputslot;
                    TupleTableSlot *epqslot;
 
                    if (IsolationUsesXactSnapshot())
                        ereport(ERROR,
                                (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                                 errmsg("could not serialize access due to concurrent update")));
 
                    /*
                     * Already know that we're going to need to do EPQ, so
                     * fetch tuple directly into the right slot.
                     */
                    EvalPlanQualBegin(context->epqstate);
                    inputslot = EvalPlanQualSlot(context->epqstate, resultRelationDesc,
                                                 resultRelInfo->ri_RangeTableIndex);
 
                    result = table_tuple_lock(resultRelationDesc, tupleid,
                                              estate->es_snapshot,
                                              inputslot, estate->es_output_cid,
                                              LockTupleExclusive, LockWaitBlock,
                                              TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
                                              &context->tmfd);
 
                    switch (result)
                    {
                        case TM_Ok:
                            Assert(context->tmfd.traversed);
                            epqslot = EvalPlanQual(context->epqstate,
                                                   resultRelationDesc,
                                                   resultRelInfo->ri_RangeTableIndex,
                                                   inputslot);
                            if (TupIsNull(epqslot))
                                /* Tuple not passing quals anymore, exiting... */
                                return NULL;
 
                            /*
                             * If requested, skip delete and pass back the
                             * updated row.
                             */
                            if (epqreturnslot)
                            {
                                *epqreturnslot = epqslot;
                                return NULL;
                            }
                            else
                                goto ldelete;
 
                        case TM_SelfModified:
 
                            /*
                             * This can be reached when following an update
                             * chain from a tuple updated by another session,
                             * reaching a tuple that was already updated in
                             * this transaction. If previously updated by this
                             * command, ignore the delete, otherwise error
                             * out.
                             *
                             * See also TM_SelfModified response to
                             * table_tuple_delete() above.
                             */
                            if (context->tmfd.cmax != estate->es_output_cid)
                                ereport(ERROR,
                                        (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
                                         errmsg("tuple to be deleted was already modified by an operation triggered by the current command"),
                                         errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
                            return NULL;
 
                        case TM_Deleted:
                            /* tuple already deleted; nothing to do */
                            return NULL;
 
                        default:
 
                            /*
                             * TM_Invisible should be impossible because we're
                             * waiting for updated row versions, and would
                             * already have errored out if the first version
                             * is invisible.
                             *
                             * TM_Updated should be impossible, because we're
                             * locking the latest version via
                             * TUPLE_LOCK_FLAG_FIND_LAST_VERSION.
                             */
                            elog(ERROR, "unexpected table_tuple_lock status: %u",
                                 result);
                            return NULL;
                    }
 
                    Assert(false);
                    break;
                }
 
            case TM_Deleted:
                if (IsolationUsesXactSnapshot())
                    ereport(ERROR,
                            (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                             errmsg("could not serialize access due to concurrent delete")));
                /* tuple already deleted; nothing to do */
                return NULL;
 
            default:
                elog(ERROR, "unrecognized table_tuple_delete status: %u",
                     result);
                return NULL;
        }
 
        /*
         * Note: Normally one would think that we have to delete index tuples
         * associated with the heap tuple now...
         *
         * ... but in POSTGRES, we have no need to do this because VACUUM will
         * take care of it later.  We can't delete index tuples immediately
         * anyway, since the tuple is still visible to other transactions.
         */
    }
 
    if (canSetTag)
        (estate->es_processed)++;
 
    /* Tell caller that the delete actually happened. */
    if (tupleDeleted)
        *tupleDeleted = true;
 
    ExecDeleteEpilogue(context, resultRelInfo, tupleid, oldtuple, changingPart);
 
    /* Process RETURNING if present and if requested */
    if (processReturning && resultRelInfo->ri_projectReturning)
    {
        /*
         * We have to put the target tuple into a slot, which means first we
         * gotta fetch it.  We can use the trigger tuple slot.
         */
        TupleTableSlot *rslot;
 
        if (resultRelInfo->ri_FdwRoutine)
        {
            /* FDW must have provided a slot containing the deleted row */
            Assert(!TupIsNull(slot));
        }
        else
        {
            slot = ExecGetReturningSlot(estate, resultRelInfo);
            if (oldtuple != NULL)
            {
                ExecForceStoreHeapTuple(oldtuple, slot, false);
            }
            else
            {
                if (!table_tuple_fetch_row_version(resultRelationDesc, tupleid,
                                                   SnapshotAny, slot))
                    elog(ERROR, "failed to fetch deleted tuple for DELETE RETURNING");
            }
        }
 
        rslot = ExecProcessReturning(resultRelInfo, slot, context->planSlot);
 
        /*
         * Before releasing the target tuple again, make sure rslot has a
         * local copy of any pass-by-reference values.
         */
        ExecMaterializeSlot(rslot);
 
        ExecClearTuple(slot);
 
        return rslot;
    }
 
    return NULL;
}

References Assert(), TM_FailureData::cmax, elog(), ModifyTableContext::epqstate, ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errhint(), errmsg(), ERROR, EState::es_output_cid, EState::es_processed, EState::es_snapshot, ModifyTableContext::estate, EvalPlanQual(), EvalPlanQualBegin(), EvalPlanQualSlot(), ExecClearTuple(), ExecDeleteAct(), ExecDeleteEpilogue(), ExecDeletePrologue(), ExecForceStoreHeapTuple(), FdwRoutine::ExecForeignDelete, ExecGetReturningSlot(), ExecIRDeleteTriggers(), ExecMaterializeSlot(), ExecProcessReturning(), ExecStoreAllNullTuple(), IsolationUsesXactSnapshot, LockTupleExclusive, LockWaitBlock, ModifyTableContext::planSlot, RelationGetRelid, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RangeTableIndex, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, SnapshotAny, table_tuple_fetch_row_version(), table_tuple_lock(), TM_Deleted, TM_Ok, TM_SelfModified, TM_Updated, ModifyTableContext::tmfd, TM_FailureData::traversed, TriggerDesc::trig_delete_instead_row, TTS_EMPTY, TupleTableSlot::tts_tableOid, TupIsNull, and TUPLE_LOCK_FLAG_FIND_LAST_VERSION.

Referenced by ExecCrossPartitionUpdate(), and ExecModifyTable().

ExecDeleteAct()

static TM_Result ExecDeleteAct ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, bool  changingPart  )

static

Definition at line 1278 of file nodeModifyTable.c.

{
    EState     *estate = context->estate;
 
    return table_tuple_delete(resultRelInfo->ri_RelationDesc, tupleid,
                              estate->es_output_cid,
                              estate->es_snapshot,
                              estate->es_crosscheck_snapshot,
                              true /* wait for commit */ ,
                              &context->tmfd,
                              changingPart);
}

References EState::es_crosscheck_snapshot, EState::es_output_cid, EState::es_snapshot, ModifyTableContext::estate, ResultRelInfo::ri_RelationDesc, table_tuple_delete(), and ModifyTableContext::tmfd.

Referenced by ExecDelete(), and ExecMergeMatched().

ExecDeleteEpilogue()

static void ExecDeleteEpilogue ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, bool  changingPart  )

static

Definition at line 1300 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    EState     *estate = context->estate;
    TransitionCaptureState *ar_delete_trig_tcs;
 
    /*
     * If this delete is the result of a partition key update that moved the
     * tuple to a new partition, put this row into the transition OLD TABLE,
     * if there is one. We need to do this separately for DELETE and INSERT
     * because they happen on different tables.
     */
    ar_delete_trig_tcs = mtstate->mt_transition_capture;
    if (mtstate->operation == CMD_UPDATE && mtstate->mt_transition_capture &&
        mtstate->mt_transition_capture->tcs_update_old_table)
    {
        ExecARUpdateTriggers(estate, resultRelInfo,
                             NULL, NULL,
                             tupleid, oldtuple,
                             NULL, NULL, mtstate->mt_transition_capture,
                             false);
 
        /*
         * We've already captured the OLD TABLE row, so make sure any AR
         * DELETE trigger fired below doesn't capture it again.
         */
        ar_delete_trig_tcs = NULL;
    }
 
    /* AFTER ROW DELETE Triggers */
    ExecARDeleteTriggers(estate, resultRelInfo, tupleid, oldtuple,
                         ar_delete_trig_tcs, changingPart);
}

References CMD_UPDATE, ModifyTableContext::estate, ExecARDeleteTriggers(), ExecARUpdateTriggers(), ModifyTableState::mt_transition_capture, ModifyTableContext::mtstate, ModifyTableState::operation, and TransitionCaptureState::tcs_update_old_table.

Referenced by ExecDelete(), and ExecMergeMatched().

ExecDeletePrologue()

static bool ExecDeletePrologue ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot **  epqreturnslot  )

static

Definition at line 1250 of file nodeModifyTable.c.

{
    /* BEFORE ROW DELETE triggers */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_delete_before_row)
    {
        /* Flush any pending inserts, so rows are visible to the triggers */
        if (context->estate->es_insert_pending_result_relations != NIL)
            ExecPendingInserts(context->estate);
 
        return ExecBRDeleteTriggers(context->estate, context->epqstate,
                                    resultRelInfo, tupleid, oldtuple,
                                    epqreturnslot);
    }
 
    return true;
}

References ModifyTableContext::epqstate, EState::es_insert_pending_result_relations, ModifyTableContext::estate, ExecBRDeleteTriggers(), ExecPendingInserts(), NIL, ResultRelInfo::ri_TrigDesc, and TriggerDesc::trig_delete_before_row.

Referenced by ExecDelete(), and ExecMergeMatched().

ExecEndModifyTable()

void ExecEndModifyTable

(

ModifyTableState *

node

)

Definition at line 4379 of file nodeModifyTable.c.

{
    int         i;
 
    /*
     * Allow any FDWs to shut down
     */
    for (i = 0; i < node->mt_nrels; i++)
    {
        int         j;
        ResultRelInfo *resultRelInfo = node->resultRelInfo + i;
 
        if (!resultRelInfo->ri_usesFdwDirectModify &&
            resultRelInfo->ri_FdwRoutine != NULL &&
            resultRelInfo->ri_FdwRoutine->EndForeignModify != NULL)
            resultRelInfo->ri_FdwRoutine->EndForeignModify(node->ps.state,
                                                           resultRelInfo);
 
        /*
         * Cleanup the initialized batch slots. This only matters for FDWs
         * with batching, but the other cases will have ri_NumSlotsInitialized
         * == 0.
         */
        for (j = 0; j < resultRelInfo->ri_NumSlotsInitialized; j++)
        {
            ExecDropSingleTupleTableSlot(resultRelInfo->ri_Slots[j]);
            ExecDropSingleTupleTableSlot(resultRelInfo->ri_PlanSlots[j]);
        }
    }
 
    /*
     * Close all the partitioned tables, leaf partitions, and their indices
     * and release the slot used for tuple routing, if set.
     */
    if (node->mt_partition_tuple_routing)
    {
        ExecCleanupTupleRouting(node, node->mt_partition_tuple_routing);
 
        if (node->mt_root_tuple_slot)
            ExecDropSingleTupleTableSlot(node->mt_root_tuple_slot);
    }
 
    /*
     * Free the exprcontext
     */
    ExecFreeExprContext(&node->ps);
 
    /*
     * clean out the tuple table
     */
    if (node->ps.ps_ResultTupleSlot)
        ExecClearTuple(node->ps.ps_ResultTupleSlot);
 
    /*
     * Terminate EPQ execution if active
     */
    EvalPlanQualEnd(&node->mt_epqstate);
 
    /*
     * shut down subplan
     */
    ExecEndNode(outerPlanState(node));
}

References FdwRoutine::EndForeignModify, EvalPlanQualEnd(), ExecCleanupTupleRouting(), ExecClearTuple(), ExecDropSingleTupleTableSlot(), ExecEndNode(), ExecFreeExprContext(), i, j, ModifyTableState::mt_epqstate, ModifyTableState::mt_nrels, ModifyTableState::mt_partition_tuple_routing, ModifyTableState::mt_root_tuple_slot, outerPlanState, ModifyTableState::ps, PlanState::ps_ResultTupleSlot, ModifyTableState::resultRelInfo, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_NumSlotsInitialized, ResultRelInfo::ri_PlanSlots, ResultRelInfo::ri_Slots, ResultRelInfo::ri_usesFdwDirectModify, and PlanState::state.

Referenced by ExecEndNode().

ExecGetInsertNewTuple()

static TupleTableSlot* ExecGetInsertNewTuple ( ResultRelInfo *  relinfo, TupleTableSlot *  planSlot  )

static

Definition at line 614 of file nodeModifyTable.c.

{
    ProjectionInfo *newProj = relinfo->ri_projectNew;
    ExprContext *econtext;
 
    /*
     * If there's no projection to be done, just make sure the slot is of the
     * right type for the target rel.  If the planSlot is the right type we
     * can use it as-is, else copy the data into ri_newTupleSlot.
     */
    if (newProj == NULL)
    {
        if (relinfo->ri_newTupleSlot->tts_ops != planSlot->tts_ops)
        {
            ExecCopySlot(relinfo->ri_newTupleSlot, planSlot);
            return relinfo->ri_newTupleSlot;
        }
        else
            return planSlot;
    }
 
    /*
     * Else project; since the projection output slot is ri_newTupleSlot, this
     * will also fix any slot-type problem.
     *
     * Note: currently, this is dead code, because INSERT cases don't receive
     * any junk columns so there's never a projection to be done.
     */
    econtext = newProj->pi_exprContext;
    econtext->ecxt_outertuple = planSlot;
    return ExecProject(newProj);
}

References ExprContext::ecxt_outertuple, ExecCopySlot(), ExecProject(), ProjectionInfo::pi_exprContext, ResultRelInfo::ri_newTupleSlot, ResultRelInfo::ri_projectNew, and TupleTableSlot::tts_ops.

Referenced by ExecModifyTable().

ExecGetUpdateNewTuple()

TupleTableSlot* ExecGetUpdateNewTuple	(	ResultRelInfo *	relinfo,
		TupleTableSlot *	planSlot,
		TupleTableSlot *	oldSlot
	)

Definition at line 658 of file nodeModifyTable.c.

{
    /* Use a few extra Asserts to protect against outside callers */
    Assert(relinfo->ri_projectNewInfoValid);
    Assert(planSlot != NULL && !TTS_EMPTY(planSlot));
    Assert(oldSlot != NULL && !TTS_EMPTY(oldSlot));
 
    return internalGetUpdateNewTuple(relinfo, planSlot, oldSlot, NULL);
}

References Assert(), internalGetUpdateNewTuple(), ResultRelInfo::ri_projectNewInfoValid, and TTS_EMPTY.

Referenced by ExecBRUpdateTriggers(), and ExecUpdate().

ExecInitInsertProjection()

static void ExecInitInsertProjection ( ModifyTableState *  mtstate, ResultRelInfo *  resultRelInfo  )

static

Definition at line 486 of file nodeModifyTable.c.

{
    ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
    Plan       *subplan = outerPlan(node);
    EState     *estate = mtstate->ps.state;
    List       *insertTargetList = NIL;
    bool        need_projection = false;
    ListCell   *l;
 
    /* Extract non-junk columns of the subplan's result tlist. */
    foreach(l, subplan->targetlist)
    {
        TargetEntry *tle = (TargetEntry *) lfirst(l);
 
        if (!tle->resjunk)
            insertTargetList = lappend(insertTargetList, tle);
        else
            need_projection = true;
    }
 
    /*
     * The junk-free list must produce a tuple suitable for the result
     * relation.
     */
    ExecCheckPlanOutput(resultRelInfo->ri_RelationDesc, insertTargetList);
 
    /* We'll need a slot matching the table's format. */
    resultRelInfo->ri_newTupleSlot =
        table_slot_create(resultRelInfo->ri_RelationDesc,
                          &estate->es_tupleTable);
 
    /* Build ProjectionInfo if needed (it probably isn't). */
    if (need_projection)
    {
        TupleDesc   relDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
 
        /* need an expression context to do the projection */
        if (mtstate->ps.ps_ExprContext == NULL)
            ExecAssignExprContext(estate, &mtstate->ps);
 
        resultRelInfo->ri_projectNew =
            ExecBuildProjectionInfo(insertTargetList,
                                    mtstate->ps.ps_ExprContext,
                                    resultRelInfo->ri_newTupleSlot,
                                    &mtstate->ps,
                                    relDesc);
    }
 
    resultRelInfo->ri_projectNewInfoValid = true;
}

References EState::es_tupleTable, ExecAssignExprContext(), ExecBuildProjectionInfo(), ExecCheckPlanOutput(), lappend(), lfirst, NIL, outerPlan, PlanState::plan, ModifyTableState::ps, PlanState::ps_ExprContext, RelationGetDescr, TargetEntry::resjunk, ResultRelInfo::ri_newTupleSlot, ResultRelInfo::ri_projectNew, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_RelationDesc, PlanState::state, and table_slot_create().

Referenced by ExecModifyTable().

ExecInitMerge()

void ExecInitMerge ( ModifyTableState *  mtstate, EState *  estate  )

static

Definition at line 3140 of file nodeModifyTable.c.

{
    ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
    ResultRelInfo *rootRelInfo = mtstate->rootResultRelInfo;
    ResultRelInfo *resultRelInfo;
    ExprContext *econtext;
    ListCell   *lc;
    int         i;
 
    if (node->mergeActionLists == NIL)
        return;
 
    mtstate->mt_merge_subcommands = 0;
 
    if (mtstate->ps.ps_ExprContext == NULL)
        ExecAssignExprContext(estate, &mtstate->ps);
    econtext = mtstate->ps.ps_ExprContext;
 
    /*
     * Create a MergeActionState for each action on the mergeActionList and
     * add it to either a list of matched actions or not-matched actions.
     *
     * Similar logic appears in ExecInitPartitionInfo(), so if changing
     * anything here, do so there too.
     */
    i = 0;
    foreach(lc, node->mergeActionLists)
    {
        List       *mergeActionList = lfirst(lc);
        TupleDesc   relationDesc;
        ListCell   *l;
 
        resultRelInfo = mtstate->resultRelInfo + i;
        i++;
        relationDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
 
        /* initialize slots for MERGE fetches from this rel */
        if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
            ExecInitMergeTupleSlots(mtstate, resultRelInfo);
 
        foreach(l, mergeActionList)
        {
            MergeAction *action = (MergeAction *) lfirst(l);
            MergeActionState *action_state;
            TupleTableSlot *tgtslot;
            TupleDesc   tgtdesc;
            List      **list;
 
            /*
             * Build action merge state for this rel.  (For partitions,
             * equivalent code exists in ExecInitPartitionInfo.)
             */
            action_state = makeNode(MergeActionState);
            action_state->mas_action = action;
            action_state->mas_whenqual = ExecInitQual((List *) action->qual,
                                                      &mtstate->ps);
 
            /*
             * We create two lists - one for WHEN MATCHED actions and one for
             * WHEN NOT MATCHED actions - and stick the MergeActionState into
             * the appropriate list.
             */
            if (action_state->mas_action->matched)
                list = &resultRelInfo->ri_matchedMergeAction;
            else
                list = &resultRelInfo->ri_notMatchedMergeAction;
            *list = lappend(*list, action_state);
 
            switch (action->commandType)
            {
                case CMD_INSERT:
                    ExecCheckPlanOutput(rootRelInfo->ri_RelationDesc,
                                        action->targetList);
 
                    /*
                     * If the MERGE targets a partitioned table, any INSERT
                     * actions must be routed through it, not the child
                     * relations. Initialize the routing struct and the root
                     * table's "new" tuple slot for that, if not already done.
                     * The projection we prepare, for all relations, uses the
                     * root relation descriptor, and targets the plan's root
                     * slot.  (This is consistent with the fact that we
                     * checked the plan output to match the root relation,
                     * above.)
                     */
                    if (rootRelInfo->ri_RelationDesc->rd_rel->relkind ==
                        RELKIND_PARTITIONED_TABLE)
                    {
                        if (mtstate->mt_partition_tuple_routing == NULL)
                        {
                            /*
                             * Initialize planstate for routing if not already
                             * done.
                             *
                             * Note that the slot is managed as a standalone
                             * slot belonging to ModifyTableState, so we pass
                             * NULL for the 2nd argument.
                             */
                            mtstate->mt_root_tuple_slot =
                                table_slot_create(rootRelInfo->ri_RelationDesc,
                                                  NULL);
                            mtstate->mt_partition_tuple_routing =
                                ExecSetupPartitionTupleRouting(estate,
                                                               rootRelInfo->ri_RelationDesc);
                        }
                        tgtslot = mtstate->mt_root_tuple_slot;
                        tgtdesc = RelationGetDescr(rootRelInfo->ri_RelationDesc);
                    }
                    else
                    {
                        /* not partitioned? use the stock relation and slot */
                        tgtslot = resultRelInfo->ri_newTupleSlot;
                        tgtdesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
                    }
 
                    action_state->mas_proj =
                        ExecBuildProjectionInfo(action->targetList, econtext,
                                                tgtslot,
                                                &mtstate->ps,
                                                tgtdesc);
 
                    mtstate->mt_merge_subcommands |= MERGE_INSERT;
                    break;
                case CMD_UPDATE:
                    action_state->mas_proj =
                        ExecBuildUpdateProjection(action->targetList,
                                                  true,
                                                  action->updateColnos,
                                                  relationDesc,
                                                  econtext,
                                                  resultRelInfo->ri_newTupleSlot,
                                                  &mtstate->ps);
                    mtstate->mt_merge_subcommands |= MERGE_UPDATE;
                    break;
                case CMD_DELETE:
                    mtstate->mt_merge_subcommands |= MERGE_DELETE;
                    break;
                case CMD_NOTHING:
                    break;
                default:
                    elog(ERROR, "unknown operation");
                    break;
            }
        }
    }
}

References generate_unaccent_rules::action, CMD_DELETE, CMD_INSERT, CMD_NOTHING, CMD_UPDATE, elog(), ERROR, ExecAssignExprContext(), ExecBuildProjectionInfo(), ExecBuildUpdateProjection(), ExecCheckPlanOutput(), ExecInitMergeTupleSlots(), ExecInitQual(), ExecSetupPartitionTupleRouting(), i, if(), lappend(), lfirst, sort-test::list, makeNode, MergeActionState::mas_action, MergeActionState::mas_proj, MergeActionState::mas_whenqual, MergeAction::matched, MERGE_DELETE, MERGE_INSERT, MERGE_UPDATE, ModifyTable::mergeActionLists, ModifyTableState::mt_merge_subcommands, ModifyTableState::mt_partition_tuple_routing, ModifyTableState::mt_root_tuple_slot, NIL, PlanState::plan, ModifyTableState::ps, PlanState::ps_ExprContext, RelationGetDescr, ModifyTableState::resultRelInfo, ModifyTableState::rootResultRelInfo, table_slot_create(), and unlikely.

Referenced by ExecInitModifyTable().

ExecInitMergeTupleSlots()

void ExecInitMergeTupleSlots	(	ModifyTableState *	mtstate,
		ResultRelInfo *	resultRelInfo
	)

Definition at line 3294 of file nodeModifyTable.c.

{
    EState     *estate = mtstate->ps.state;
 
    Assert(!resultRelInfo->ri_projectNewInfoValid);
 
    resultRelInfo->ri_oldTupleSlot =
        table_slot_create(resultRelInfo->ri_RelationDesc,
                          &estate->es_tupleTable);
    resultRelInfo->ri_newTupleSlot =
        table_slot_create(resultRelInfo->ri_RelationDesc,
                          &estate->es_tupleTable);
    resultRelInfo->ri_projectNewInfoValid = true;
}

References Assert(), EState::es_tupleTable, ModifyTableState::ps, ResultRelInfo::ri_newTupleSlot, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_RelationDesc, PlanState::state, and table_slot_create().

Referenced by ExecInitMerge(), and ExecInitPartitionInfo().

ExecInitModifyTable()

ModifyTableState* ExecInitModifyTable	(	ModifyTable *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 3892 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate;
    Plan       *subplan = outerPlan(node);
    CmdType     operation = node->operation;
    int         nrels = list_length(node->resultRelations);
    ResultRelInfo *resultRelInfo;
    List       *arowmarks;
    ListCell   *l;
    int         i;
    Relation    rel;
 
    /* check for unsupported flags */
    Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
 
    /*
     * create state structure
     */
    mtstate = makeNode(ModifyTableState);
    mtstate->ps.plan = (Plan *) node;
    mtstate->ps.state = estate;
    mtstate->ps.ExecProcNode = ExecModifyTable;
 
    mtstate->operation = operation;
    mtstate->canSetTag = node->canSetTag;
    mtstate->mt_done = false;
 
    mtstate->mt_nrels = nrels;
    mtstate->resultRelInfo = (ResultRelInfo *)
        palloc(nrels * sizeof(ResultRelInfo));
 
    mtstate->mt_merge_inserted = 0;
    mtstate->mt_merge_updated = 0;
    mtstate->mt_merge_deleted = 0;
 
    /*----------
     * Resolve the target relation. This is the same as:
     *
     * - the relation for which we will fire FOR STATEMENT triggers,
     * - the relation into whose tuple format all captured transition tuples
     *   must be converted, and
     * - the root partitioned table used for tuple routing.
     *
     * If it's a partitioned table, the root partition doesn't appear
     * elsewhere in the plan and its RT index is given explicitly in
     * node->rootRelation.  Otherwise (i.e. table inheritance) the target
     * relation is the first relation in the node->resultRelations list.
     *----------
     */
    if (node->rootRelation > 0)
    {
        mtstate->rootResultRelInfo = makeNode(ResultRelInfo);
        ExecInitResultRelation(estate, mtstate->rootResultRelInfo,
                               node->rootRelation);
    }
    else
    {
        mtstate->rootResultRelInfo = mtstate->resultRelInfo;
        ExecInitResultRelation(estate, mtstate->resultRelInfo,
                               linitial_int(node->resultRelations));
    }
 
    /* set up epqstate with dummy subplan data for the moment */
    EvalPlanQualInit(&mtstate->mt_epqstate, estate, NULL, NIL, node->epqParam);
    mtstate->fireBSTriggers = true;
 
    /*
     * Build state for collecting transition tuples.  This requires having a
     * valid trigger query context, so skip it in explain-only mode.
     */
    if (!(eflags & EXEC_FLAG_EXPLAIN_ONLY))
        ExecSetupTransitionCaptureState(mtstate, estate);
 
    /*
     * Open all the result relations and initialize the ResultRelInfo structs.
     * (But root relation was initialized above, if it's part of the array.)
     * We must do this before initializing the subplan, because direct-modify
     * FDWs expect their ResultRelInfos to be available.
     */
    resultRelInfo = mtstate->resultRelInfo;
    i = 0;
    foreach(l, node->resultRelations)
    {
        Index       resultRelation = lfirst_int(l);
 
        if (resultRelInfo != mtstate->rootResultRelInfo)
        {
            ExecInitResultRelation(estate, resultRelInfo, resultRelation);
 
            /*
             * For child result relations, store the root result relation
             * pointer.  We do so for the convenience of places that want to
             * look at the query's original target relation but don't have the
             * mtstate handy.
             */
            resultRelInfo->ri_RootResultRelInfo = mtstate->rootResultRelInfo;
        }
 
        /* Initialize the usesFdwDirectModify flag */
        resultRelInfo->ri_usesFdwDirectModify =
            bms_is_member(i, node->fdwDirectModifyPlans);
 
        /*
         * Verify result relation is a valid target for the current operation
         */
        CheckValidResultRel(resultRelInfo, operation);
 
        resultRelInfo++;
        i++;
    }
 
    /*
     * Now we may initialize the subplan.
     */
    outerPlanState(mtstate) = ExecInitNode(subplan, estate, eflags);
 
    /*
     * Do additional per-result-relation initialization.
     */
    for (i = 0; i < nrels; i++)
    {
        resultRelInfo = &mtstate->resultRelInfo[i];
 
        /* Let FDWs init themselves for foreign-table result rels */
        if (!resultRelInfo->ri_usesFdwDirectModify &&
            resultRelInfo->ri_FdwRoutine != NULL &&
            resultRelInfo->ri_FdwRoutine->BeginForeignModify != NULL)
        {
            List       *fdw_private = (List *) list_nth(node->fdwPrivLists, i);
 
            resultRelInfo->ri_FdwRoutine->BeginForeignModify(mtstate,
                                                             resultRelInfo,
                                                             fdw_private,
                                                             i,
                                                             eflags);
        }
 
        /*
         * For UPDATE/DELETE/MERGE, find the appropriate junk attr now, either
         * a 'ctid' or 'wholerow' attribute depending on relkind.  For foreign
         * tables, the FDW might have created additional junk attr(s), but
         * those are no concern of ours.
         */
        if (operation == CMD_UPDATE || operation == CMD_DELETE ||
            operation == CMD_MERGE)
        {
            char        relkind;
 
            relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
            if (relkind == RELKIND_RELATION ||
                relkind == RELKIND_MATVIEW ||
                relkind == RELKIND_PARTITIONED_TABLE)
            {
                resultRelInfo->ri_RowIdAttNo =
                    ExecFindJunkAttributeInTlist(subplan->targetlist, "ctid");
                if (!AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
                    elog(ERROR, "could not find junk ctid column");
            }
            else if (relkind == RELKIND_FOREIGN_TABLE)
            {
                /*
                 * We don't support MERGE with foreign tables for now.  (It's
                 * problematic because the implementation uses CTID.)
                 */
                Assert(operation != CMD_MERGE);
 
                /*
                 * When there is a row-level trigger, there should be a
                 * wholerow attribute.  We also require it to be present in
                 * UPDATE and MERGE, so we can get the values of unchanged
                 * columns.
                 */
                resultRelInfo->ri_RowIdAttNo =
                    ExecFindJunkAttributeInTlist(subplan->targetlist,
                                                 "wholerow");
                if ((mtstate->operation == CMD_UPDATE || mtstate->operation == CMD_MERGE) &&
                    !AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
                    elog(ERROR, "could not find junk wholerow column");
            }
            else
            {
                /* No support for MERGE */
                Assert(operation != CMD_MERGE);
                /* Other valid target relkinds must provide wholerow */
                resultRelInfo->ri_RowIdAttNo =
                    ExecFindJunkAttributeInTlist(subplan->targetlist,
                                                 "wholerow");
                if (!AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
                    elog(ERROR, "could not find junk wholerow column");
            }
        }
    }
 
    /*
     * If this is an inherited update/delete/merge, there will be a junk
     * attribute named "tableoid" present in the subplan's targetlist.  It
     * will be used to identify the result relation for a given tuple to be
     * updated/deleted/merged.
     */
    mtstate->mt_resultOidAttno =
        ExecFindJunkAttributeInTlist(subplan->targetlist, "tableoid");
    Assert(AttributeNumberIsValid(mtstate->mt_resultOidAttno) || nrels == 1);
    mtstate->mt_lastResultOid = InvalidOid; /* force lookup at first tuple */
    mtstate->mt_lastResultIndex = 0;    /* must be zero if no such attr */
 
    /* Get the root target relation */
    rel = mtstate->rootResultRelInfo->ri_RelationDesc;
 
    /*
     * Build state for tuple routing if it's a partitioned INSERT.  An UPDATE
     * or MERGE might need this too, but only if it actually moves tuples
     * between partitions; in that case setup is done by
     * ExecCrossPartitionUpdate.
     */
    if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE &&
        operation == CMD_INSERT)
        mtstate->mt_partition_tuple_routing =
            ExecSetupPartitionTupleRouting(estate, rel);
 
    /*
     * Initialize any WITH CHECK OPTION constraints if needed.
     */
    resultRelInfo = mtstate->resultRelInfo;
    foreach(l, node->withCheckOptionLists)
    {
        List       *wcoList = (List *) lfirst(l);
        List       *wcoExprs = NIL;
        ListCell   *ll;
 
        foreach(ll, wcoList)
        {
            WithCheckOption *wco = (WithCheckOption *) lfirst(ll);
            ExprState  *wcoExpr = ExecInitQual((List *) wco->qual,
                                               &mtstate->ps);
 
            wcoExprs = lappend(wcoExprs, wcoExpr);
        }
 
        resultRelInfo->ri_WithCheckOptions = wcoList;
        resultRelInfo->ri_WithCheckOptionExprs = wcoExprs;
        resultRelInfo++;
    }
 
    /*
     * Initialize RETURNING projections if needed.
     */
    if (node->returningLists)
    {
        TupleTableSlot *slot;
        ExprContext *econtext;
 
        /*
         * Initialize result tuple slot and assign its rowtype using the first
         * RETURNING list.  We assume the rest will look the same.
         */
        mtstate->ps.plan->targetlist = (List *) linitial(node->returningLists);
 
        /* Set up a slot for the output of the RETURNING projection(s) */
        ExecInitResultTupleSlotTL(&mtstate->ps, &TTSOpsVirtual);
        slot = mtstate->ps.ps_ResultTupleSlot;
 
        /* Need an econtext too */
        if (mtstate->ps.ps_ExprContext == NULL)
            ExecAssignExprContext(estate, &mtstate->ps);
        econtext = mtstate->ps.ps_ExprContext;
 
        /*
         * Build a projection for each result rel.
         */
        resultRelInfo = mtstate->resultRelInfo;
        foreach(l, node->returningLists)
        {
            List       *rlist = (List *) lfirst(l);
 
            resultRelInfo->ri_returningList = rlist;
            resultRelInfo->ri_projectReturning =
                ExecBuildProjectionInfo(rlist, econtext, slot, &mtstate->ps,
                                        resultRelInfo->ri_RelationDesc->rd_att);
            resultRelInfo++;
        }
    }
    else
    {
        /*
         * We still must construct a dummy result tuple type, because InitPlan
         * expects one (maybe should change that?).
         */
        mtstate->ps.plan->targetlist = NIL;
        ExecInitResultTypeTL(&mtstate->ps);
 
        mtstate->ps.ps_ExprContext = NULL;
    }
 
    /* Set the list of arbiter indexes if needed for ON CONFLICT */
    resultRelInfo = mtstate->resultRelInfo;
    if (node->onConflictAction != ONCONFLICT_NONE)
    {
        /* insert may only have one relation, inheritance is not expanded */
        Assert(nrels == 1);
        resultRelInfo->ri_onConflictArbiterIndexes = node->arbiterIndexes;
    }
 
    /*
     * If needed, Initialize target list, projection and qual for ON CONFLICT
     * DO UPDATE.
     */
    if (node->onConflictAction == ONCONFLICT_UPDATE)
    {
        OnConflictSetState *onconfl = makeNode(OnConflictSetState);
        ExprContext *econtext;
        TupleDesc   relationDesc;
 
        /* already exists if created by RETURNING processing above */
        if (mtstate->ps.ps_ExprContext == NULL)
            ExecAssignExprContext(estate, &mtstate->ps);
 
        econtext = mtstate->ps.ps_ExprContext;
        relationDesc = resultRelInfo->ri_RelationDesc->rd_att;
 
        /* create state for DO UPDATE SET operation */
        resultRelInfo->ri_onConflict = onconfl;
 
        /* initialize slot for the existing tuple */
        onconfl->oc_Existing =
            table_slot_create(resultRelInfo->ri_RelationDesc,
                              &mtstate->ps.state->es_tupleTable);
 
        /*
         * Create the tuple slot for the UPDATE SET projection. We want a slot
         * of the table's type here, because the slot will be used to insert
         * into the table, and for RETURNING processing - which may access
         * system attributes.
         */
        onconfl->oc_ProjSlot =
            table_slot_create(resultRelInfo->ri_RelationDesc,
                              &mtstate->ps.state->es_tupleTable);
 
        /* build UPDATE SET projection state */
        onconfl->oc_ProjInfo =
            ExecBuildUpdateProjection(node->onConflictSet,
                                      true,
                                      node->onConflictCols,
                                      relationDesc,
                                      econtext,
                                      onconfl->oc_ProjSlot,
                                      &mtstate->ps);
 
        /* initialize state to evaluate the WHERE clause, if any */
        if (node->onConflictWhere)
        {
            ExprState  *qualexpr;
 
            qualexpr = ExecInitQual((List *) node->onConflictWhere,
                                    &mtstate->ps);
            onconfl->oc_WhereClause = qualexpr;
        }
    }
 
    /*
     * If we have any secondary relations in an UPDATE or DELETE, they need to
     * be treated like non-locked relations in SELECT FOR UPDATE, ie, the
     * EvalPlanQual mechanism needs to be told about them.  Locate the
     * relevant ExecRowMarks.
     */
    arowmarks = NIL;
    foreach(l, node->rowMarks)
    {
        PlanRowMark *rc = lfirst_node(PlanRowMark, l);
        ExecRowMark *erm;
        ExecAuxRowMark *aerm;
 
        /* ignore "parent" rowmarks; they are irrelevant at runtime */
        if (rc->isParent)
            continue;
 
        /* Find ExecRowMark and build ExecAuxRowMark */
        erm = ExecFindRowMark(estate, rc->rti, false);
        aerm = ExecBuildAuxRowMark(erm, subplan->targetlist);
        arowmarks = lappend(arowmarks, aerm);
    }
 
    /* For a MERGE command, initialize its state */
    if (mtstate->operation == CMD_MERGE)
        ExecInitMerge(mtstate, estate);
 
    EvalPlanQualSetPlan(&mtstate->mt_epqstate, subplan, arowmarks);
 
    /*
     * If there are a lot of result relations, use a hash table to speed the
     * lookups.  If there are not a lot, a simple linear search is faster.
     *
     * It's not clear where the threshold is, but try 64 for starters.  In a
     * debugging build, use a small threshold so that we get some test
     * coverage of both code paths.
     */
#ifdef USE_ASSERT_CHECKING
#define MT_NRELS_HASH 4
#else
#define MT_NRELS_HASH 64
#endif
    if (nrels >= MT_NRELS_HASH)
    {
        HASHCTL     hash_ctl;
 
        hash_ctl.keysize = sizeof(Oid);
        hash_ctl.entrysize = sizeof(MTTargetRelLookup);
        hash_ctl.hcxt = CurrentMemoryContext;
        mtstate->mt_resultOidHash =
            hash_create("ModifyTable target hash",
                        nrels, &hash_ctl,
                        HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
        for (i = 0; i < nrels; i++)
        {
            Oid         hashkey;
            MTTargetRelLookup *mtlookup;
            bool        found;
 
            resultRelInfo = &mtstate->resultRelInfo[i];
            hashkey = RelationGetRelid(resultRelInfo->ri_RelationDesc);
            mtlookup = (MTTargetRelLookup *)
                hash_search(mtstate->mt_resultOidHash, &hashkey,
                            HASH_ENTER, &found);
            Assert(!found);
            mtlookup->relationIndex = i;
        }
    }
    else
        mtstate->mt_resultOidHash = NULL;
 
    /*
     * Determine if the FDW supports batch insert and determine the batch size
     * (a FDW may support batching, but it may be disabled for the
     * server/table).
     *
     * We only do this for INSERT, so that for UPDATE/DELETE the batch size
     * remains set to 0.
     */
    if (operation == CMD_INSERT)
    {
        /* insert may only have one relation, inheritance is not expanded */
        Assert(nrels == 1);
        resultRelInfo = mtstate->resultRelInfo;
        if (!resultRelInfo->ri_usesFdwDirectModify &&
            resultRelInfo->ri_FdwRoutine != NULL &&
            resultRelInfo->ri_FdwRoutine->GetForeignModifyBatchSize &&
            resultRelInfo->ri_FdwRoutine->ExecForeignBatchInsert)
        {
            resultRelInfo->ri_BatchSize =
                resultRelInfo->ri_FdwRoutine->GetForeignModifyBatchSize(resultRelInfo);
            Assert(resultRelInfo->ri_BatchSize >= 1);
        }
        else
            resultRelInfo->ri_BatchSize = 1;
 
        /*
         * If doing batch insert, setup back-link so we can easily find the
         * mtstate again.
         */
        if (resultRelInfo->ri_BatchSize > 1)
            resultRelInfo->ri_ModifyTableState = mtstate;
    }
 
    /*
     * Lastly, if this is not the primary (canSetTag) ModifyTable node, add it
     * to estate->es_auxmodifytables so that it will be run to completion by
     * ExecPostprocessPlan.  (It'd actually work fine to add the primary
     * ModifyTable node too, but there's no need.)  Note the use of lcons not
     * lappend: we need later-initialized ModifyTable nodes to be shut down
     * before earlier ones.  This ensures that we don't throw away RETURNING
     * rows that need to be seen by a later CTE subplan.
     */
    if (!mtstate->canSetTag)
        estate->es_auxmodifytables = lcons(mtstate,
                                           estate->es_auxmodifytables);
 
    return mtstate;
}

References ModifyTable::arbiterIndexes, Assert(), AttributeNumberIsValid, FdwRoutine::BeginForeignModify, bms_is_member(), ModifyTableState::canSetTag, ModifyTable::canSetTag, CheckValidResultRel(), CMD_DELETE, CMD_INSERT, CMD_MERGE, CMD_UPDATE, CurrentMemoryContext, elog(), HASHCTL::entrysize, ModifyTable::epqParam, ERROR, EState::es_auxmodifytables, EState::es_tupleTable, EvalPlanQualInit(), EvalPlanQualSetPlan(), EXEC_FLAG_BACKWARD, EXEC_FLAG_EXPLAIN_ONLY, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecBuildAuxRowMark(), ExecBuildProjectionInfo(), ExecBuildUpdateProjection(), ExecFindJunkAttributeInTlist(), ExecFindRowMark(), FdwRoutine::ExecForeignBatchInsert, ExecInitMerge(), ExecInitNode(), ExecInitQual(), ExecInitResultRelation(), ExecInitResultTupleSlotTL(), ExecInitResultTypeTL(), ExecModifyTable(), PlanState::ExecProcNode, ExecSetupPartitionTupleRouting(), ExecSetupTransitionCaptureState(), ModifyTable::fdwDirectModifyPlans, ModifyTable::fdwPrivLists, ModifyTableState::fireBSTriggers, FdwRoutine::GetForeignModifyBatchSize, HASH_BLOBS, HASH_CONTEXT, hash_create(), HASH_ELEM, HASH_ENTER, hash_search(), HASHCTL::hcxt, i, InvalidOid, PlanRowMark::isParent, HASHCTL::keysize, lappend(), lcons(), lfirst, lfirst_int, lfirst_node, linitial, linitial_int, list_length(), list_nth(), makeNode, ModifyTableState::mt_done, ModifyTableState::mt_epqstate, ModifyTableState::mt_lastResultIndex, ModifyTableState::mt_lastResultOid, ModifyTableState::mt_merge_deleted, ModifyTableState::mt_merge_inserted, ModifyTableState::mt_merge_updated, ModifyTableState::mt_nrels, MT_NRELS_HASH, ModifyTableState::mt_partition_tuple_routing, ModifyTableState::mt_resultOidAttno, ModifyTableState::mt_resultOidHash, NIL, OnConflictSetState::oc_Existing, OnConflictSetState::oc_ProjInfo, OnConflictSetState::oc_ProjSlot, OnConflictSetState::oc_WhereClause, ONCONFLICT_NONE, ONCONFLICT_UPDATE, ModifyTable::onConflictAction, ModifyTable::onConflictCols, ModifyTable::onConflictSet, ModifyTable::onConflictWhere, ModifyTableState::operation, ModifyTable::operation, outerPlan, outerPlanState, palloc(), PlanState::plan, ModifyTableState::ps, PlanState::ps_ExprContext, PlanState::ps_ResultTupleSlot, WithCheckOption::qual, RelationData::rd_att, RelationData::rd_rel, RelationGetRelid, MTTargetRelLookup::relationIndex, ModifyTable::resultRelations, ModifyTableState::resultRelInfo, ModifyTable::returningLists, ResultRelInfo::ri_BatchSize, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_ModifyTableState, ResultRelInfo::ri_onConflict, ResultRelInfo::ri_onConflictArbiterIndexes, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_returningList, ResultRelInfo::ri_RootResultRelInfo, ResultRelInfo::ri_RowIdAttNo, ResultRelInfo::ri_usesFdwDirectModify, ResultRelInfo::ri_WithCheckOptionExprs, ResultRelInfo::ri_WithCheckOptions, ModifyTable::rootRelation, ModifyTableState::rootResultRelInfo, ModifyTable::rowMarks, PlanRowMark::rti, PlanState::state, table_slot_create(), Plan::targetlist, TTSOpsVirtual, and ModifyTable::withCheckOptionLists.

Referenced by ExecInitNode().

ExecInitUpdateProjection()

static void ExecInitUpdateProjection ( ModifyTableState *  mtstate, ResultRelInfo *  resultRelInfo  )

static

Definition at line 556 of file nodeModifyTable.c.

{
    ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
    Plan       *subplan = outerPlan(node);
    EState     *estate = mtstate->ps.state;
    TupleDesc   relDesc = RelationGetDescr(resultRelInfo->ri_RelationDesc);
    int         whichrel;
    List       *updateColnos;
 
    /*
     * Usually, mt_lastResultIndex matches the target rel.  If it happens not
     * to, we can get the index the hard way with an integer division.
     */
    whichrel = mtstate->mt_lastResultIndex;
    if (resultRelInfo != mtstate->resultRelInfo + whichrel)
    {
        whichrel = resultRelInfo - mtstate->resultRelInfo;
        Assert(whichrel >= 0 && whichrel < mtstate->mt_nrels);
    }
 
    updateColnos = (List *) list_nth(node->updateColnosLists, whichrel);
 
    /*
     * For UPDATE, we use the old tuple to fill up missing values in the tuple
     * produced by the subplan to get the new tuple.  We need two slots, both
     * matching the table's desired format.
     */
    resultRelInfo->ri_oldTupleSlot =
        table_slot_create(resultRelInfo->ri_RelationDesc,
                          &estate->es_tupleTable);
    resultRelInfo->ri_newTupleSlot =
        table_slot_create(resultRelInfo->ri_RelationDesc,
                          &estate->es_tupleTable);
 
    /* need an expression context to do the projection */
    if (mtstate->ps.ps_ExprContext == NULL)
        ExecAssignExprContext(estate, &mtstate->ps);
 
    resultRelInfo->ri_projectNew =
        ExecBuildUpdateProjection(subplan->targetlist,
                                  false,    /* subplan did the evaluation */
                                  updateColnos,
                                  relDesc,
                                  mtstate->ps.ps_ExprContext,
                                  resultRelInfo->ri_newTupleSlot,
                                  &mtstate->ps);
 
    resultRelInfo->ri_projectNewInfoValid = true;
}

References Assert(), EState::es_tupleTable, ExecAssignExprContext(), ExecBuildUpdateProjection(), list_nth(), ModifyTableState::mt_lastResultIndex, outerPlan, PlanState::plan, ModifyTableState::ps, PlanState::ps_ExprContext, RelationGetDescr, ModifyTableState::resultRelInfo, ResultRelInfo::ri_newTupleSlot, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_projectNew, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_RelationDesc, PlanState::state, table_slot_create(), and ModifyTable::updateColnosLists.

Referenced by ExecCrossPartitionUpdate(), ExecModifyTable(), and ExecUpdate().

ExecInsert()

static TupleTableSlot* ExecInsert ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, TupleTableSlot *  slot, bool  canSetTag, TupleTableSlot **  inserted_tuple, ResultRelInfo **  insert_destrel  )

static

Definition at line 708 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    EState     *estate = context->estate;
    Relation    resultRelationDesc;
    List       *recheckIndexes = NIL;
    TupleTableSlot *planSlot = context->planSlot;
    TupleTableSlot *result = NULL;
    TransitionCaptureState *ar_insert_trig_tcs;
    ModifyTable *node = (ModifyTable *) mtstate->ps.plan;
    OnConflictAction onconflict = node->onConflictAction;
    PartitionTupleRouting *proute = mtstate->mt_partition_tuple_routing;
    MemoryContext oldContext;
 
    /*
     * If the input result relation is a partitioned table, find the leaf
     * partition to insert the tuple into.
     */
    if (proute)
    {
        ResultRelInfo *partRelInfo;
 
        slot = ExecPrepareTupleRouting(mtstate, estate, proute,
                                       resultRelInfo, slot,
                                       &partRelInfo);
        resultRelInfo = partRelInfo;
    }
 
    ExecMaterializeSlot(slot);
 
    resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
    /*
     * Open the table's indexes, if we have not done so already, so that we
     * can add new index entries for the inserted tuple.
     */
    if (resultRelationDesc->rd_rel->relhasindex &&
        resultRelInfo->ri_IndexRelationDescs == NULL)
        ExecOpenIndices(resultRelInfo, onconflict != ONCONFLICT_NONE);
 
    /*
     * BEFORE ROW INSERT Triggers.
     *
     * Note: We fire BEFORE ROW TRIGGERS for every attempted insertion in an
     * INSERT ... ON CONFLICT statement.  We cannot check for constraint
     * violations before firing these triggers, because they can change the
     * values to insert.  Also, they can run arbitrary user-defined code with
     * side-effects that we can't cancel by just not inserting the tuple.
     */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_insert_before_row)
    {
        /* Flush any pending inserts, so rows are visible to the triggers */
        if (estate->es_insert_pending_result_relations != NIL)
            ExecPendingInserts(estate);
 
        if (!ExecBRInsertTriggers(estate, resultRelInfo, slot))
            return NULL;        /* "do nothing" */
    }
 
    /* INSTEAD OF ROW INSERT Triggers */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_insert_instead_row)
    {
        if (!ExecIRInsertTriggers(estate, resultRelInfo, slot))
            return NULL;        /* "do nothing" */
    }
    else if (resultRelInfo->ri_FdwRoutine)
    {
        /*
         * GENERATED expressions might reference the tableoid column, so
         * (re-)initialize tts_tableOid before evaluating them.
         */
        slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
 
        /*
         * Compute stored generated columns
         */
        if (resultRelationDesc->rd_att->constr &&
            resultRelationDesc->rd_att->constr->has_generated_stored)
            ExecComputeStoredGenerated(resultRelInfo, estate, slot,
                                       CMD_INSERT);
 
        /*
         * If the FDW supports batching, and batching is requested, accumulate
         * rows and insert them in batches. Otherwise use the per-row inserts.
         */
        if (resultRelInfo->ri_BatchSize > 1)
        {
            bool        flushed = false;
 
            /*
             * When we've reached the desired batch size, perform the
             * insertion.
             */
            if (resultRelInfo->ri_NumSlots == resultRelInfo->ri_BatchSize)
            {
                ExecBatchInsert(mtstate, resultRelInfo,
                                resultRelInfo->ri_Slots,
                                resultRelInfo->ri_PlanSlots,
                                resultRelInfo->ri_NumSlots,
                                estate, canSetTag);
                resultRelInfo->ri_NumSlots = 0;
                flushed = true;
            }
 
            oldContext = MemoryContextSwitchTo(estate->es_query_cxt);
 
            if (resultRelInfo->ri_Slots == NULL)
            {
                resultRelInfo->ri_Slots = palloc(sizeof(TupleTableSlot *) *
                                                 resultRelInfo->ri_BatchSize);
                resultRelInfo->ri_PlanSlots = palloc(sizeof(TupleTableSlot *) *
                                                     resultRelInfo->ri_BatchSize);
            }
 
            /*
             * Initialize the batch slots. We don't know how many slots will
             * be needed, so we initialize them as the batch grows, and we
             * keep them across batches. To mitigate an inefficiency in how
             * resource owner handles objects with many references (as with
             * many slots all referencing the same tuple descriptor) we copy
             * the appropriate tuple descriptor for each slot.
             */
            if (resultRelInfo->ri_NumSlots >= resultRelInfo->ri_NumSlotsInitialized)
            {
                TupleDesc   tdesc = CreateTupleDescCopy(slot->tts_tupleDescriptor);
                TupleDesc   plan_tdesc =
                CreateTupleDescCopy(planSlot->tts_tupleDescriptor);
 
                resultRelInfo->ri_Slots[resultRelInfo->ri_NumSlots] =
                    MakeSingleTupleTableSlot(tdesc, slot->tts_ops);
 
                resultRelInfo->ri_PlanSlots[resultRelInfo->ri_NumSlots] =
                    MakeSingleTupleTableSlot(plan_tdesc, planSlot->tts_ops);
 
                /* remember how many batch slots we initialized */
                resultRelInfo->ri_NumSlotsInitialized++;
            }
 
            ExecCopySlot(resultRelInfo->ri_Slots[resultRelInfo->ri_NumSlots],
                         slot);
 
            ExecCopySlot(resultRelInfo->ri_PlanSlots[resultRelInfo->ri_NumSlots],
                         planSlot);
 
            /*
             * If these are the first tuples stored in the buffers, add the
             * target rel to the es_insert_pending_result_relations list,
             * except in the case where flushing was done above, in which case
             * the target rel would already have been added to the list, so no
             * need to do this.
             */
            if (resultRelInfo->ri_NumSlots == 0 && !flushed)
            {
                Assert(!list_member_ptr(estate->es_insert_pending_result_relations,
                                        resultRelInfo));
                estate->es_insert_pending_result_relations =
                    lappend(estate->es_insert_pending_result_relations,
                            resultRelInfo);
            }
            Assert(list_member_ptr(estate->es_insert_pending_result_relations,
                                   resultRelInfo));
 
            resultRelInfo->ri_NumSlots++;
 
            MemoryContextSwitchTo(oldContext);
 
            return NULL;
        }
 
        /*
         * insert into foreign table: let the FDW do it
         */
        slot = resultRelInfo->ri_FdwRoutine->ExecForeignInsert(estate,
                                                               resultRelInfo,
                                                               slot,
                                                               planSlot);
 
        if (slot == NULL)       /* "do nothing" */
            return NULL;
 
        /*
         * AFTER ROW Triggers or RETURNING expressions might reference the
         * tableoid column, so (re-)initialize tts_tableOid before evaluating
         * them.  (This covers the case where the FDW replaced the slot.)
         */
        slot->tts_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
    }
    else
    {
        WCOKind     wco_kind;
 
        /*
         * Constraints and GENERATED expressions might reference the tableoid
         * column, so (re-)initialize tts_tableOid before evaluating them.
         */
        slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
 
        /*
         * Compute stored generated columns
         */
        if (resultRelationDesc->rd_att->constr &&
            resultRelationDesc->rd_att->constr->has_generated_stored)
            ExecComputeStoredGenerated(resultRelInfo, estate, slot,
                                       CMD_INSERT);
 
        /*
         * Check any RLS WITH CHECK policies.
         *
         * Normally we should check INSERT policies. But if the insert is the
         * result of a partition key update that moved the tuple to a new
         * partition, we should instead check UPDATE policies, because we are
         * executing policies defined on the target table, and not those
         * defined on the child partitions.
         *
         * If we're running MERGE, we refer to the action that we're executing
         * to know if we're doing an INSERT or UPDATE to a partition table.
         */
        if (mtstate->operation == CMD_UPDATE)
            wco_kind = WCO_RLS_UPDATE_CHECK;
        else if (mtstate->operation == CMD_MERGE)
            wco_kind = (context->relaction->mas_action->commandType == CMD_UPDATE) ?
                WCO_RLS_UPDATE_CHECK : WCO_RLS_INSERT_CHECK;
        else
            wco_kind = WCO_RLS_INSERT_CHECK;
 
        /*
         * ExecWithCheckOptions() will skip any WCOs which are not of the kind
         * we are looking for at this point.
         */
        if (resultRelInfo->ri_WithCheckOptions != NIL)
            ExecWithCheckOptions(wco_kind, resultRelInfo, slot, estate);
 
        /*
         * Check the constraints of the tuple.
         */
        if (resultRelationDesc->rd_att->constr)
            ExecConstraints(resultRelInfo, slot, estate);
 
        /*
         * Also check the tuple against the partition constraint, if there is
         * one; except that if we got here via tuple-routing, we don't need to
         * if there's no BR trigger defined on the partition.
         */
        if (resultRelationDesc->rd_rel->relispartition &&
            (resultRelInfo->ri_RootResultRelInfo == NULL ||
             (resultRelInfo->ri_TrigDesc &&
              resultRelInfo->ri_TrigDesc->trig_insert_before_row)))
            ExecPartitionCheck(resultRelInfo, slot, estate, true);
 
        if (onconflict != ONCONFLICT_NONE && resultRelInfo->ri_NumIndices > 0)
        {
            /* Perform a speculative insertion. */
            uint32      specToken;
            ItemPointerData conflictTid;
            bool        specConflict;
            List       *arbiterIndexes;
 
            arbiterIndexes = resultRelInfo->ri_onConflictArbiterIndexes;
 
            /*
             * Do a non-conclusive check for conflicts first.
             *
             * We're not holding any locks yet, so this doesn't guarantee that
             * the later insert won't conflict.  But it avoids leaving behind
             * a lot of canceled speculative insertions, if you run a lot of
             * INSERT ON CONFLICT statements that do conflict.
             *
             * We loop back here if we find a conflict below, either during
             * the pre-check, or when we re-check after inserting the tuple
             * speculatively.  Better allow interrupts in case some bug makes
             * this an infinite loop.
             */
    vlock:
            CHECK_FOR_INTERRUPTS();
            specConflict = false;
            if (!ExecCheckIndexConstraints(resultRelInfo, slot, estate,
                                           &conflictTid, arbiterIndexes))
            {
                /* committed conflict tuple found */
                if (onconflict == ONCONFLICT_UPDATE)
                {
                    /*
                     * In case of ON CONFLICT DO UPDATE, execute the UPDATE
                     * part.  Be prepared to retry if the UPDATE fails because
                     * of another concurrent UPDATE/DELETE to the conflict
                     * tuple.
                     */
                    TupleTableSlot *returning = NULL;
 
                    if (ExecOnConflictUpdate(context, resultRelInfo,
                                             &conflictTid, slot, canSetTag,
                                             &returning))
                    {
                        InstrCountTuples2(&mtstate->ps, 1);
                        return returning;
                    }
                    else
                        goto vlock;
                }
                else
                {
                    /*
                     * In case of ON CONFLICT DO NOTHING, do nothing. However,
                     * verify that the tuple is visible to the executor's MVCC
                     * snapshot at higher isolation levels.
                     *
                     * Using ExecGetReturningSlot() to store the tuple for the
                     * recheck isn't that pretty, but we can't trivially use
                     * the input slot, because it might not be of a compatible
                     * type. As there's no conflicting usage of
                     * ExecGetReturningSlot() in the DO NOTHING case...
                     */
                    Assert(onconflict == ONCONFLICT_NOTHING);
                    ExecCheckTIDVisible(estate, resultRelInfo, &conflictTid,
                                        ExecGetReturningSlot(estate, resultRelInfo));
                    InstrCountTuples2(&mtstate->ps, 1);
                    return NULL;
                }
            }
 
            /*
             * Before we start insertion proper, acquire our "speculative
             * insertion lock".  Others can use that to wait for us to decide
             * if we're going to go ahead with the insertion, instead of
             * waiting for the whole transaction to complete.
             */
            specToken = SpeculativeInsertionLockAcquire(GetCurrentTransactionId());
 
            /* insert the tuple, with the speculative token */
            table_tuple_insert_speculative(resultRelationDesc, slot,
                                           estate->es_output_cid,
                                           0,
                                           NULL,
                                           specToken);
 
            /* insert index entries for tuple */
            recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
                                                   slot, estate, false, true,
                                                   &specConflict,
                                                   arbiterIndexes);
 
            /* adjust the tuple's state accordingly */
            table_tuple_complete_speculative(resultRelationDesc, slot,
                                             specToken, !specConflict);
 
            /*
             * Wake up anyone waiting for our decision.  They will re-check
             * the tuple, see that it's no longer speculative, and wait on our
             * XID as if this was a regularly inserted tuple all along.  Or if
             * we killed the tuple, they will see it's dead, and proceed as if
             * the tuple never existed.
             */
            SpeculativeInsertionLockRelease(GetCurrentTransactionId());
 
            /*
             * If there was a conflict, start from the beginning.  We'll do
             * the pre-check again, which will now find the conflicting tuple
             * (unless it aborts before we get there).
             */
            if (specConflict)
            {
                list_free(recheckIndexes);
                goto vlock;
            }
 
            /* Since there was no insertion conflict, we're done */
        }
        else
        {
            /* insert the tuple normally */
            table_tuple_insert(resultRelationDesc, slot,
                               estate->es_output_cid,
                               0, NULL);
 
            /* insert index entries for tuple */
            if (resultRelInfo->ri_NumIndices > 0)
                recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
                                                       slot, estate, false,
                                                       false, NULL, NIL);
        }
    }
 
    if (canSetTag)
        (estate->es_processed)++;
 
    /*
     * If this insert is the result of a partition key update that moved the
     * tuple to a new partition, put this row into the transition NEW TABLE,
     * if there is one. We need to do this separately for DELETE and INSERT
     * because they happen on different tables.
     */
    ar_insert_trig_tcs = mtstate->mt_transition_capture;
    if (mtstate->operation == CMD_UPDATE && mtstate->mt_transition_capture
        && mtstate->mt_transition_capture->tcs_update_new_table)
    {
        ExecARUpdateTriggers(estate, resultRelInfo,
                             NULL, NULL,
                             NULL,
                             NULL,
                             slot,
                             NULL,
                             mtstate->mt_transition_capture,
                             false);
 
        /*
         * We've already captured the NEW TABLE row, so make sure any AR
         * INSERT trigger fired below doesn't capture it again.
         */
        ar_insert_trig_tcs = NULL;
    }
 
    /* AFTER ROW INSERT Triggers */
    ExecARInsertTriggers(estate, resultRelInfo, slot, recheckIndexes,
                         ar_insert_trig_tcs);
 
    list_free(recheckIndexes);
 
    /*
     * Check any WITH CHECK OPTION constraints from parent views.  We are
     * required to do this after testing all constraints and uniqueness
     * violations per the SQL spec, so we do it after actually inserting the
     * record into the heap and all indexes.
     *
     * ExecWithCheckOptions will elog(ERROR) if a violation is found, so the
     * tuple will never be seen, if it violates the WITH CHECK OPTION.
     *
     * ExecWithCheckOptions() will skip any WCOs which are not of the kind we
     * are looking for at this point.
     */
    if (resultRelInfo->ri_WithCheckOptions != NIL)
        ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo, slot, estate);
 
    /* Process RETURNING if present */
    if (resultRelInfo->ri_projectReturning)
        result = ExecProcessReturning(resultRelInfo, slot, planSlot);
 
    if (inserted_tuple)
        *inserted_tuple = slot;
    if (insert_destrel)
        *insert_destrel = resultRelInfo;
 
    return result;
}

References Assert(), CHECK_FOR_INTERRUPTS, CMD_INSERT, CMD_MERGE, CMD_UPDATE, MergeAction::commandType, TupleDescData::constr, CreateTupleDescCopy(), EState::es_insert_pending_result_relations, EState::es_output_cid, EState::es_processed, EState::es_query_cxt, ModifyTableContext::estate, ExecARInsertTriggers(), ExecARUpdateTriggers(), ExecBatchInsert(), ExecBRInsertTriggers(), ExecCheckIndexConstraints(), ExecCheckTIDVisible(), ExecComputeStoredGenerated(), ExecConstraints(), ExecCopySlot(), FdwRoutine::ExecForeignInsert, ExecGetReturningSlot(), ExecInsertIndexTuples(), ExecIRInsertTriggers(), ExecMaterializeSlot(), ExecOnConflictUpdate(), ExecOpenIndices(), ExecPartitionCheck(), ExecPendingInserts(), ExecPrepareTupleRouting(), ExecProcessReturning(), ExecWithCheckOptions(), GetCurrentTransactionId(), TupleConstr::has_generated_stored, if(), InstrCountTuples2, lappend(), list_free(), list_member_ptr(), MakeSingleTupleTableSlot(), MergeActionState::mas_action, MemoryContextSwitchTo(), ModifyTableState::mt_partition_tuple_routing, ModifyTableState::mt_transition_capture, ModifyTableContext::mtstate, NIL, ONCONFLICT_NONE, ONCONFLICT_NOTHING, ONCONFLICT_UPDATE, ModifyTable::onConflictAction, ModifyTableState::operation, palloc(), PlanState::plan, ModifyTableContext::planSlot, ModifyTableState::ps, RelationData::rd_att, RelationData::rd_rel, ModifyTableContext::relaction, RelationGetRelid, ResultRelInfo::ri_BatchSize, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_IndexRelationDescs, ResultRelInfo::ri_NumIndices, ResultRelInfo::ri_NumSlots, ResultRelInfo::ri_NumSlotsInitialized, ResultRelInfo::ri_onConflictArbiterIndexes, ResultRelInfo::ri_PlanSlots, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_RootResultRelInfo, ResultRelInfo::ri_Slots, ResultRelInfo::ri_TrigDesc, ResultRelInfo::ri_WithCheckOptions, SpeculativeInsertionLockAcquire(), SpeculativeInsertionLockRelease(), table_tuple_complete_speculative(), table_tuple_insert(), table_tuple_insert_speculative(), TransitionCaptureState::tcs_update_new_table, TriggerDesc::trig_insert_before_row, TriggerDesc::trig_insert_instead_row, TupleTableSlot::tts_ops, TupleTableSlot::tts_tableOid, TupleTableSlot::tts_tupleDescriptor, WCO_RLS_INSERT_CHECK, WCO_RLS_UPDATE_CHECK, and WCO_VIEW_CHECK.

Referenced by ExecCrossPartitionUpdate(), ExecMergeNotMatched(), and ExecModifyTable().

ExecLookupResultRelByOid()

ResultRelInfo* ExecLookupResultRelByOid	(	ModifyTableState *	node,
		Oid	resultoid,
		bool	missing_ok,
		bool	update_cache
	)

Definition at line 3843 of file nodeModifyTable.c.

{
    if (node->mt_resultOidHash)
    {
        /* Use the pre-built hash table to locate the rel */
        MTTargetRelLookup *mtlookup;
 
        mtlookup = (MTTargetRelLookup *)
            hash_search(node->mt_resultOidHash, &resultoid, HASH_FIND, NULL);
        if (mtlookup)
        {
            if (update_cache)
            {
                node->mt_lastResultOid = resultoid;
                node->mt_lastResultIndex = mtlookup->relationIndex;
            }
            return node->resultRelInfo + mtlookup->relationIndex;
        }
    }
    else
    {
        /* With few target rels, just search the ResultRelInfo array */
        for (int ndx = 0; ndx < node->mt_nrels; ndx++)
        {
            ResultRelInfo *rInfo = node->resultRelInfo + ndx;
 
            if (RelationGetRelid(rInfo->ri_RelationDesc) == resultoid)
            {
                if (update_cache)
                {
                    node->mt_lastResultOid = resultoid;
                    node->mt_lastResultIndex = ndx;
                }
                return rInfo;
            }
        }
    }
 
    if (!missing_ok)
        elog(ERROR, "incorrect result relation OID %u", resultoid);
    return NULL;
}

References elog(), ERROR, HASH_FIND, hash_search(), ModifyTableState::mt_lastResultIndex, ModifyTableState::mt_lastResultOid, ModifyTableState::mt_nrels, ModifyTableState::mt_resultOidHash, RelationGetRelid, MTTargetRelLookup::relationIndex, ModifyTableState::resultRelInfo, and ResultRelInfo::ri_RelationDesc.

Referenced by ExecFindPartition(), and ExecModifyTable().

ExecMerge()

static TupleTableSlot * ExecMerge ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, bool  canSetTag  )

static

Definition at line 2633 of file nodeModifyTable.c.

{
    bool        matched;
 
    /*-----
     * If we are dealing with a WHEN MATCHED case (tupleid is valid), we
     * execute the first action for which the additional WHEN MATCHED AND
     * quals pass.  If an action without quals is found, that action is
     * executed.
     *
     * Similarly, if we are dealing with WHEN NOT MATCHED case, we look at
     * the given WHEN NOT MATCHED actions in sequence until one passes.
     *
     * Things get interesting in case of concurrent update/delete of the
     * target tuple. Such concurrent update/delete is detected while we are
     * executing a WHEN MATCHED action.
     *
     * A concurrent update can:
     *
     * 1. modify the target tuple so that it no longer satisfies the
     *    additional quals attached to the current WHEN MATCHED action
     *
     *    In this case, we are still dealing with a WHEN MATCHED case.
     *    We recheck the list of WHEN MATCHED actions from the start and
     *    choose the first one that satisfies the new target tuple.
     *
     * 2. modify the target tuple so that the join quals no longer pass and
     *    hence the source tuple no longer has a match.
     *
     *    In this case, the source tuple no longer matches the target tuple,
     *    so we now instead find a qualifying WHEN NOT MATCHED action to
     *    execute.
     *
     * XXX Hmmm, what if the updated tuple would now match one that was
     * considered NOT MATCHED so far?
     *
     * A concurrent delete changes a WHEN MATCHED case to WHEN NOT MATCHED.
     *
     * ExecMergeMatched takes care of following the update chain and
     * re-finding the qualifying WHEN MATCHED action, as long as the updated
     * target tuple still satisfies the join quals, i.e., it remains a WHEN
     * MATCHED case. If the tuple gets deleted or the join quals fail, it
     * returns and we try ExecMergeNotMatched. Given that ExecMergeMatched
     * always make progress by following the update chain and we never switch
     * from ExecMergeNotMatched to ExecMergeMatched, there is no risk of a
     * livelock.
     */
    matched = tupleid != NULL;
    if (matched)
        matched = ExecMergeMatched(context, resultRelInfo, tupleid, canSetTag);
 
    /*
     * Either we were dealing with a NOT MATCHED tuple or ExecMergeMatched()
     * returned "false", indicating the previously MATCHED tuple no longer
     * matches.
     */
    if (!matched)
        ExecMergeNotMatched(context, resultRelInfo, canSetTag);
 
    /* No RETURNING support yet */
    return NULL;
}

References ExecMergeMatched(), and ExecMergeNotMatched().

Referenced by ExecModifyTable().

ExecMergeMatched()

static bool ExecMergeMatched ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, bool  canSetTag  )

static

Definition at line 2719 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    TupleTableSlot *newslot;
    EState     *estate = context->estate;
    ExprContext *econtext = mtstate->ps.ps_ExprContext;
    bool        isNull;
    EPQState   *epqstate = &mtstate->mt_epqstate;
    ListCell   *l;
 
    /*
     * If there are no WHEN MATCHED actions, we are done.
     */
    if (resultRelInfo->ri_matchedMergeAction == NIL)
        return true;
 
    /*
     * Make tuple and any needed join variables available to ExecQual and
     * ExecProject. The target's existing tuple is installed in the scantuple.
     * Again, this target relation's slot is required only in the case of a
     * MATCHED tuple and UPDATE/DELETE actions.
     */
    econtext->ecxt_scantuple = resultRelInfo->ri_oldTupleSlot;
    econtext->ecxt_innertuple = context->planSlot;
    econtext->ecxt_outertuple = NULL;
 
lmerge_matched:
 
    /*
     * This routine is only invoked for matched rows, and we must have found
     * the tupleid of the target row in that case; fetch that tuple.
     *
     * We use SnapshotAny for this because we might get called again after
     * EvalPlanQual returns us a new tuple, which may not be visible to our
     * MVCC snapshot.
     */
 
    if (!table_tuple_fetch_row_version(resultRelInfo->ri_RelationDesc,
                                       tupleid,
                                       SnapshotAny,
                                       resultRelInfo->ri_oldTupleSlot))
        elog(ERROR, "failed to fetch the target tuple");
 
    foreach(l, resultRelInfo->ri_matchedMergeAction)
    {
        MergeActionState *relaction = (MergeActionState *) lfirst(l);
        CmdType     commandType = relaction->mas_action->commandType;
        List       *recheckIndexes = NIL;
        TM_Result   result;
        UpdateContext updateCxt = {0};
 
        /*
         * Test condition, if any.
         *
         * In the absence of any condition, we perform the action
         * unconditionally (no need to check separately since ExecQual() will
         * return true if there are no conditions to evaluate).
         */
        if (!ExecQual(relaction->mas_whenqual, econtext))
            continue;
 
        /*
         * Check if the existing target tuple meets the USING checks of
         * UPDATE/DELETE RLS policies. If those checks fail, we throw an
         * error.
         *
         * The WITH CHECK quals are applied in ExecUpdate() and hence we need
         * not do anything special to handle them.
         *
         * NOTE: We must do this after WHEN quals are evaluated, so that we
         * check policies only when they matter.
         */
        if (resultRelInfo->ri_WithCheckOptions)
        {
            ExecWithCheckOptions(commandType == CMD_UPDATE ?
                                 WCO_RLS_MERGE_UPDATE_CHECK : WCO_RLS_MERGE_DELETE_CHECK,
                                 resultRelInfo,
                                 resultRelInfo->ri_oldTupleSlot,
                                 context->mtstate->ps.state);
        }
 
        /* Perform stated action */
        switch (commandType)
        {
            case CMD_UPDATE:
 
                /*
                 * Project the output tuple, and use that to update the table.
                 * We don't need to filter out junk attributes, because the
                 * UPDATE action's targetlist doesn't have any.
                 */
                newslot = ExecProject(relaction->mas_proj);
 
                context->relaction = relaction;
                context->GetUpdateNewTuple = mergeGetUpdateNewTuple;
                context->cpUpdateRetrySlot = NULL;
 
                if (!ExecUpdatePrologue(context, resultRelInfo,
                                        tupleid, NULL, newslot))
                {
                    result = TM_Ok;
                    break;
                }
                ExecUpdatePrepareSlot(resultRelInfo, newslot, context->estate);
                result = ExecUpdateAct(context, resultRelInfo, tupleid, NULL,
                                       newslot, mtstate->canSetTag, &updateCxt);
                if (result == TM_Ok && updateCxt.updated)
                {
                    ExecUpdateEpilogue(context, &updateCxt, resultRelInfo,
                                       tupleid, NULL, newslot, recheckIndexes);
                    mtstate->mt_merge_updated += 1;
                }
 
                break;
 
            case CMD_DELETE:
                context->relaction = relaction;
                if (!ExecDeletePrologue(context, resultRelInfo, tupleid,
                                        NULL, NULL))
                {
                    result = TM_Ok;
                    break;
                }
                result = ExecDeleteAct(context, resultRelInfo, tupleid, false);
                if (result == TM_Ok)
                {
                    ExecDeleteEpilogue(context, resultRelInfo, tupleid, NULL,
                                       false);
                    mtstate->mt_merge_deleted += 1;
                }
                break;
 
            case CMD_NOTHING:
                /* Doing nothing is always OK */
                result = TM_Ok;
                break;
 
            default:
                elog(ERROR, "unknown action in MERGE WHEN MATCHED clause");
        }
 
        switch (result)
        {
            case TM_Ok:
                /* all good; perform final actions */
                if (canSetTag && commandType != CMD_NOTHING)
                    (estate->es_processed)++;
 
                break;
 
            case TM_SelfModified:
 
                /*
                 * The SQL standard disallows this for MERGE.
                 */
                if (TransactionIdIsCurrentTransactionId(context->tmfd.xmax))
                    ereport(ERROR,
                            (errcode(ERRCODE_CARDINALITY_VIOLATION),
                    /* translator: %s is a SQL command name */
                             errmsg("%s command cannot affect row a second time",
                                    "MERGE"),
                             errhint("Ensure that not more than one source row matches any one target row.")));
                /* This shouldn't happen */
                elog(ERROR, "attempted to update or delete invisible tuple");
                break;
 
            case TM_Deleted:
                if (IsolationUsesXactSnapshot())
                    ereport(ERROR,
                            (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                             errmsg("could not serialize access due to concurrent delete")));
 
                /*
                 * If the tuple was already deleted, return to let caller
                 * handle it under NOT MATCHED clauses.
                 */
                return false;
 
            case TM_Updated:
                {
                    Relation    resultRelationDesc;
                    TupleTableSlot *epqslot,
                               *inputslot;
                    LockTupleMode lockmode;
 
                    /*
                     * The target tuple was concurrently updated by some other
                     * transaction.
                     */
 
                    /*
                     * If cpUpdateRetrySlot is set, ExecCrossPartitionUpdate()
                     * must have detected that the tuple was concurrently
                     * updated, so we restart the search for an appropriate
                     * WHEN MATCHED clause to process the updated tuple.
                     *
                     * In this case, ExecDelete() would already have performed
                     * EvalPlanQual() on the latest version of the tuple,
                     * which in turn would already have been loaded into
                     * ri_oldTupleSlot, so no need to do either of those
                     * things.
                     *
                     * XXX why do we not check the WHEN NOT MATCHED list in
                     * this case?
                     */
                    if (!TupIsNull(context->cpUpdateRetrySlot))
                        goto lmerge_matched;
 
                    /*
                     * Otherwise, we run the EvalPlanQual() with the new
                     * version of the tuple. If EvalPlanQual() does not return
                     * a tuple, then we switch to the NOT MATCHED list of
                     * actions. If it does return a tuple and the join qual is
                     * still satisfied, then we just need to recheck the
                     * MATCHED actions, starting from the top, and execute the
                     * first qualifying action.
                     */
                    resultRelationDesc = resultRelInfo->ri_RelationDesc;
                    lockmode = ExecUpdateLockMode(estate, resultRelInfo);
 
                    inputslot = EvalPlanQualSlot(epqstate, resultRelationDesc,
                                                 resultRelInfo->ri_RangeTableIndex);
 
                    result = table_tuple_lock(resultRelationDesc, tupleid,
                                              estate->es_snapshot,
                                              inputslot, estate->es_output_cid,
                                              lockmode, LockWaitBlock,
                                              TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
                                              &context->tmfd);
                    switch (result)
                    {
                        case TM_Ok:
                            epqslot = EvalPlanQual(epqstate,
                                                   resultRelationDesc,
                                                   resultRelInfo->ri_RangeTableIndex,
                                                   inputslot);
 
                            /*
                             * If we got no tuple, or the tuple we get has a
                             * NULL ctid, go back to caller: this one is not a
                             * MATCHED tuple anymore, so they can retry with
                             * NOT MATCHED actions.
                             */
                            if (TupIsNull(epqslot))
                                return false;
 
                            (void) ExecGetJunkAttribute(epqslot,
                                                        resultRelInfo->ri_RowIdAttNo,
                                                        &isNull);
                            if (isNull)
                                return false;
 
                            /*
                             * When a tuple was updated and migrated to
                             * another partition concurrently, the current
                             * MERGE implementation can't follow.  There's
                             * probably a better way to handle this case, but
                             * it'd require recognizing the relation to which
                             * the tuple moved, and setting our current
                             * resultRelInfo to that.
                             */
                            if (ItemPointerIndicatesMovedPartitions(&context->tmfd.ctid))
                                ereport(ERROR,
                                        (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                                         errmsg("tuple to be deleted was already moved to another partition due to concurrent update")));
 
                            /*
                             * A non-NULL ctid means that we are still dealing
                             * with MATCHED case. Restart the loop so that we
                             * apply all the MATCHED rules again, to ensure
                             * that the first qualifying WHEN MATCHED action
                             * is executed.
                             *
                             * Update tupleid to that of the new tuple, for
                             * the refetch we do at the top.
                             */
                            ItemPointerCopy(&context->tmfd.ctid, tupleid);
                            goto lmerge_matched;
 
                        case TM_Deleted:
 
                            /*
                             * tuple already deleted; tell caller to run NOT
                             * MATCHED actions
                             */
                            return false;
 
                        case TM_SelfModified:
 
                            /*
                             * This can be reached when following an update
                             * chain from a tuple updated by another session,
                             * reaching a tuple that was already updated in
                             * this transaction. If previously modified by
                             * this command, ignore the redundant update,
                             * otherwise error out.
                             *
                             * See also response to TM_SelfModified in
                             * ExecUpdate().
                             */
                            if (context->tmfd.cmax != estate->es_output_cid)
                                ereport(ERROR,
                                        (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
                                         errmsg("tuple to be updated or deleted was already modified by an operation triggered by the current command"),
                                         errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
                            return false;
 
                        default:
                            /* see table_tuple_lock call in ExecDelete() */
                            elog(ERROR, "unexpected table_tuple_lock status: %u",
                                 result);
                            return false;
                    }
                }
 
            case TM_Invisible:
            case TM_WouldBlock:
            case TM_BeingModified:
                /* these should not occur */
                elog(ERROR, "unexpected tuple operation result: %d", result);
                break;
        }
 
        /*
         * We've activated one of the WHEN clauses, so we don't search
         * further. This is required behaviour, not an optimization.
         */
        break;
    }
 
    /*
     * Successfully executed an action or no qualifying action was found.
     */
    return true;
}

References ModifyTableState::canSetTag, TM_FailureData::cmax, CMD_DELETE, CMD_NOTHING, CMD_UPDATE, MergeAction::commandType, ModifyTableContext::cpUpdateRetrySlot, TM_FailureData::ctid, ExprContext::ecxt_innertuple, ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, elog(), ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errhint(), errmsg(), ERROR, EState::es_output_cid, EState::es_processed, EState::es_snapshot, ModifyTableContext::estate, EvalPlanQual(), EvalPlanQualSlot(), ExecDeleteAct(), ExecDeleteEpilogue(), ExecDeletePrologue(), ExecGetJunkAttribute(), ExecProject(), ExecQual(), ExecUpdateAct(), ExecUpdateEpilogue(), ExecUpdateLockMode(), ExecUpdatePrepareSlot(), ExecUpdatePrologue(), ExecWithCheckOptions(), ModifyTableContext::GetUpdateNewTuple, IsolationUsesXactSnapshot, ItemPointerCopy(), ItemPointerIndicatesMovedPartitions(), lfirst, LockWaitBlock, MergeActionState::mas_action, MergeActionState::mas_proj, MergeActionState::mas_whenqual, mergeGetUpdateNewTuple(), ModifyTableState::mt_epqstate, ModifyTableState::mt_merge_deleted, ModifyTableState::mt_merge_updated, ModifyTableContext::mtstate, NIL, ModifyTableContext::planSlot, ModifyTableState::ps, PlanState::ps_ExprContext, ModifyTableContext::relaction, ResultRelInfo::ri_matchedMergeAction, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_RangeTableIndex, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_RowIdAttNo, ResultRelInfo::ri_WithCheckOptions, SnapshotAny, PlanState::state, table_tuple_fetch_row_version(), table_tuple_lock(), TM_BeingModified, TM_Deleted, TM_Invisible, TM_Ok, TM_SelfModified, TM_Updated, TM_WouldBlock, ModifyTableContext::tmfd, TransactionIdIsCurrentTransactionId(), TupIsNull, TUPLE_LOCK_FLAG_FIND_LAST_VERSION, UpdateContext::updated, WCO_RLS_MERGE_DELETE_CHECK, WCO_RLS_MERGE_UPDATE_CHECK, and TM_FailureData::xmax.

Referenced by ExecMerge().

ExecMergeNotMatched()

static void ExecMergeNotMatched ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, bool  canSetTag  )

static

Definition at line 3060 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    ExprContext *econtext = mtstate->ps.ps_ExprContext;
    List       *actionStates = NIL;
    ListCell   *l;
 
    /*
     * For INSERT actions, the root relation's merge action is OK since the
     * INSERT's targetlist and the WHEN conditions can only refer to the
     * source relation and hence it does not matter which result relation we
     * work with.
     *
     * XXX does this mean that we can avoid creating copies of actionStates on
     * partitioned tables, for not-matched actions?
     */
    actionStates = resultRelInfo->ri_notMatchedMergeAction;
 
    /*
     * Make source tuple available to ExecQual and ExecProject. We don't need
     * the target tuple, since the WHEN quals and targetlist can't refer to
     * the target columns.
     */
    econtext->ecxt_scantuple = NULL;
    econtext->ecxt_innertuple = context->planSlot;
    econtext->ecxt_outertuple = NULL;
 
    foreach(l, actionStates)
    {
        MergeActionState *action = (MergeActionState *) lfirst(l);
        CmdType     commandType = action->mas_action->commandType;
        TupleTableSlot *newslot;
 
        /*
         * Test condition, if any.
         *
         * In the absence of any condition, we perform the action
         * unconditionally (no need to check separately since ExecQual() will
         * return true if there are no conditions to evaluate).
         */
        if (!ExecQual(action->mas_whenqual, econtext))
            continue;
 
        /* Perform stated action */
        switch (commandType)
        {
            case CMD_INSERT:
 
                /*
                 * Project the tuple.  In case of a partitioned table, the
                 * projection was already built to use the root's descriptor,
                 * so we don't need to map the tuple here.
                 */
                newslot = ExecProject(action->mas_proj);
                context->relaction = action;
 
                (void) ExecInsert(context, mtstate->rootResultRelInfo, newslot,
                                  canSetTag, NULL, NULL);
                mtstate->mt_merge_inserted += 1;
                break;
            case CMD_NOTHING:
                /* Do nothing */
                break;
            default:
                elog(ERROR, "unknown action in MERGE WHEN NOT MATCHED clause");
        }
 
        /*
         * We've activated one of the WHEN clauses, so we don't search
         * further. This is required behaviour, not an optimization.
         */
        break;
    }
}

References generate_unaccent_rules::action, CMD_INSERT, CMD_NOTHING, ExprContext::ecxt_innertuple, ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, elog(), ERROR, ExecInsert(), ExecProject(), ExecQual(), lfirst, ModifyTableState::mt_merge_inserted, ModifyTableContext::mtstate, NIL, ModifyTableContext::planSlot, ModifyTableState::ps, PlanState::ps_ExprContext, ModifyTableContext::relaction, ResultRelInfo::ri_notMatchedMergeAction, and ModifyTableState::rootResultRelInfo.

Referenced by ExecMerge().

ExecModifyTable()

static TupleTableSlot* ExecModifyTable ( PlanState *  pstate )

static

Definition at line 3504 of file nodeModifyTable.c.

{
    ModifyTableState *node = castNode(ModifyTableState, pstate);
    ModifyTableContext context;
    EState     *estate = node->ps.state;
    CmdType     operation = node->operation;
    ResultRelInfo *resultRelInfo;
    PlanState  *subplanstate;
    TupleTableSlot *slot;
    TupleTableSlot *oldSlot;
    ItemPointerData tuple_ctid;
    HeapTupleData oldtupdata;
    HeapTuple   oldtuple;
    ItemPointer tupleid;
 
    CHECK_FOR_INTERRUPTS();
 
    /*
     * This should NOT get called during EvalPlanQual; we should have passed a
     * subplan tree to EvalPlanQual, instead.  Use a runtime test not just
     * Assert because this condition is easy to miss in testing.  (Note:
     * although ModifyTable should not get executed within an EvalPlanQual
     * operation, we do have to allow it to be initialized and shut down in
     * case it is within a CTE subplan.  Hence this test must be here, not in
     * ExecInitModifyTable.)
     */
    if (estate->es_epq_active != NULL)
        elog(ERROR, "ModifyTable should not be called during EvalPlanQual");
 
    /*
     * If we've already completed processing, don't try to do more.  We need
     * this test because ExecPostprocessPlan might call us an extra time, and
     * our subplan's nodes aren't necessarily robust against being called
     * extra times.
     */
    if (node->mt_done)
        return NULL;
 
    /*
     * On first call, fire BEFORE STATEMENT triggers before proceeding.
     */
    if (node->fireBSTriggers)
    {
        fireBSTriggers(node);
        node->fireBSTriggers = false;
    }
 
    /* Preload local variables */
    resultRelInfo = node->resultRelInfo + node->mt_lastResultIndex;
    subplanstate = outerPlanState(node);
 
    /* Set global context */
    context.mtstate = node;
    context.epqstate = &node->mt_epqstate;
    context.estate = estate;
 
    /*
     * Fetch rows from subplan, and execute the required table modification
     * for each row.
     */
    for (;;)
    {
        /*
         * Reset the per-output-tuple exprcontext.  This is needed because
         * triggers expect to use that context as workspace.  It's a bit ugly
         * to do this below the top level of the plan, however.  We might need
         * to rethink this later.
         */
        ResetPerTupleExprContext(estate);
 
        /*
         * Reset per-tuple memory context used for processing on conflict and
         * returning clauses, to free any expression evaluation storage
         * allocated in the previous cycle.
         */
        if (pstate->ps_ExprContext)
            ResetExprContext(pstate->ps_ExprContext);
 
        context.planSlot = ExecProcNode(subplanstate);
 
        /* No more tuples to process? */
        if (TupIsNull(context.planSlot))
            break;
 
        /*
         * When there are multiple result relations, each tuple contains a
         * junk column that gives the OID of the rel from which it came.
         * Extract it and select the correct result relation.
         */
        if (AttributeNumberIsValid(node->mt_resultOidAttno))
        {
            Datum       datum;
            bool        isNull;
            Oid         resultoid;
 
            datum = ExecGetJunkAttribute(context.planSlot, node->mt_resultOidAttno,
                                         &isNull);
            if (isNull)
            {
                /*
                 * For commands other than MERGE, any tuples having InvalidOid
                 * for tableoid are errors.  For MERGE, we may need to handle
                 * them as WHEN NOT MATCHED clauses if any, so do that.
                 *
                 * Note that we use the node's toplevel resultRelInfo, not any
                 * specific partition's.
                 */
                if (operation == CMD_MERGE)
                {
                    EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
 
                    ExecMerge(&context, node->resultRelInfo, NULL, node->canSetTag);
                    continue;   /* no RETURNING support yet */
                }
 
                elog(ERROR, "tableoid is NULL");
            }
            resultoid = DatumGetObjectId(datum);
 
            /* If it's not the same as last time, we need to locate the rel */
            if (resultoid != node->mt_lastResultOid)
                resultRelInfo = ExecLookupResultRelByOid(node, resultoid,
                                                         false, true);
        }
 
        /*
         * If resultRelInfo->ri_usesFdwDirectModify is true, all we need to do
         * here is compute the RETURNING expressions.
         */
        if (resultRelInfo->ri_usesFdwDirectModify)
        {
            Assert(resultRelInfo->ri_projectReturning);
 
            /*
             * A scan slot containing the data that was actually inserted,
             * updated or deleted has already been made available to
             * ExecProcessReturning by IterateDirectModify, so no need to
             * provide it here.
             */
            slot = ExecProcessReturning(resultRelInfo, NULL, context.planSlot);
 
            return slot;
        }
 
        EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
        slot = context.planSlot;
 
        tupleid = NULL;
        oldtuple = NULL;
 
        /*
         * For UPDATE/DELETE/MERGE, fetch the row identity info for the tuple
         * to be updated/deleted/merged.  For a heap relation, that's a TID;
         * otherwise we may have a wholerow junk attr that carries the old
         * tuple in toto.  Keep this in step with the part of
         * ExecInitModifyTable that sets up ri_RowIdAttNo.
         */
        if (operation == CMD_UPDATE || operation == CMD_DELETE ||
            operation == CMD_MERGE)
        {
            char        relkind;
            Datum       datum;
            bool        isNull;
 
            relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
            if (relkind == RELKIND_RELATION ||
                relkind == RELKIND_MATVIEW ||
                relkind == RELKIND_PARTITIONED_TABLE)
            {
                /* ri_RowIdAttNo refers to a ctid attribute */
                Assert(AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo));
                datum = ExecGetJunkAttribute(slot,
                                             resultRelInfo->ri_RowIdAttNo,
                                             &isNull);
 
                /*
                 * For commands other than MERGE, any tuples having a null row
                 * identifier are errors.  For MERGE, we may need to handle
                 * them as WHEN NOT MATCHED clauses if any, so do that.
                 *
                 * Note that we use the node's toplevel resultRelInfo, not any
                 * specific partition's.
                 */
                if (isNull)
                {
                    if (operation == CMD_MERGE)
                    {
                        EvalPlanQualSetSlot(&node->mt_epqstate, context.planSlot);
 
                        ExecMerge(&context, node->resultRelInfo, NULL, node->canSetTag);
                        continue;   /* no RETURNING support yet */
                    }
 
                    elog(ERROR, "ctid is NULL");
                }
 
                tupleid = (ItemPointer) DatumGetPointer(datum);
                tuple_ctid = *tupleid;  /* be sure we don't free ctid!! */
                tupleid = &tuple_ctid;
            }
 
            /*
             * Use the wholerow attribute, when available, to reconstruct the
             * old relation tuple.  The old tuple serves one or both of two
             * purposes: 1) it serves as the OLD tuple for row triggers, 2) it
             * provides values for any unchanged columns for the NEW tuple of
             * an UPDATE, because the subplan does not produce all the columns
             * of the target table.
             *
             * Note that the wholerow attribute does not carry system columns,
             * so foreign table triggers miss seeing those, except that we
             * know enough here to set t_tableOid.  Quite separately from
             * this, the FDW may fetch its own junk attrs to identify the row.
             *
             * Other relevant relkinds, currently limited to views, always
             * have a wholerow attribute.
             */
            else if (AttributeNumberIsValid(resultRelInfo->ri_RowIdAttNo))
            {
                datum = ExecGetJunkAttribute(slot,
                                             resultRelInfo->ri_RowIdAttNo,
                                             &isNull);
                /* shouldn't ever get a null result... */
                if (isNull)
                    elog(ERROR, "wholerow is NULL");
 
                oldtupdata.t_data = DatumGetHeapTupleHeader(datum);
                oldtupdata.t_len =
                    HeapTupleHeaderGetDatumLength(oldtupdata.t_data);
                ItemPointerSetInvalid(&(oldtupdata.t_self));
                /* Historically, view triggers see invalid t_tableOid. */
                oldtupdata.t_tableOid =
                    (relkind == RELKIND_VIEW) ? InvalidOid :
                    RelationGetRelid(resultRelInfo->ri_RelationDesc);
 
                oldtuple = &oldtupdata;
            }
            else
            {
                /* Only foreign tables are allowed to omit a row-ID attr */
                Assert(relkind == RELKIND_FOREIGN_TABLE);
            }
        }
 
        switch (operation)
        {
            case CMD_INSERT:
                /* Initialize projection info if first time for this table */
                if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
                    ExecInitInsertProjection(node, resultRelInfo);
                slot = ExecGetInsertNewTuple(resultRelInfo, context.planSlot);
                slot = ExecInsert(&context, resultRelInfo, slot,
                                  node->canSetTag, NULL, NULL);
                break;
 
            case CMD_UPDATE:
                /* Initialize projection info if first time for this table */
                if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
                    ExecInitUpdateProjection(node, resultRelInfo);
 
                /*
                 * Make the new tuple by combining plan's output tuple with
                 * the old tuple being updated.
                 */
                oldSlot = resultRelInfo->ri_oldTupleSlot;
                if (oldtuple != NULL)
                {
                    /* Use the wholerow junk attr as the old tuple. */
                    ExecForceStoreHeapTuple(oldtuple, oldSlot, false);
                }
                else
                {
                    /* Fetch the most recent version of old tuple. */
                    Relation    relation = resultRelInfo->ri_RelationDesc;
 
                    if (!table_tuple_fetch_row_version(relation, tupleid,
                                                       SnapshotAny,
                                                       oldSlot))
                        elog(ERROR, "failed to fetch tuple being updated");
                }
                slot = internalGetUpdateNewTuple(resultRelInfo, context.planSlot,
                                                 oldSlot, NULL);
                context.GetUpdateNewTuple = internalGetUpdateNewTuple;
                context.relaction = NULL;
 
                /* Now apply the update. */
                slot = ExecUpdate(&context, resultRelInfo, tupleid, oldtuple,
                                  slot, node->canSetTag);
                break;
 
            case CMD_DELETE:
                slot = ExecDelete(&context, resultRelInfo, tupleid, oldtuple,
                                  true, false, node->canSetTag, NULL, NULL);
                break;
 
            case CMD_MERGE:
                slot = ExecMerge(&context, resultRelInfo, tupleid, node->canSetTag);
                break;
 
            default:
                elog(ERROR, "unknown operation");
                break;
        }
 
        /*
         * If we got a RETURNING result, return it to caller.  We'll continue
         * the work on next call.
         */
        if (slot)
            return slot;
    }
 
    /*
     * Insert remaining tuples for batch insert.
     */
    if (estate->es_insert_pending_result_relations != NIL)
        ExecPendingInserts(estate);
 
    /*
     * We're done, but fire AFTER STATEMENT triggers before exiting.
     */
    fireASTriggers(node);
 
    node->mt_done = true;
 
    return NULL;
}

References Assert(), AttributeNumberIsValid, ModifyTableState::canSetTag, castNode, CHECK_FOR_INTERRUPTS, CMD_DELETE, CMD_INSERT, CMD_MERGE, CMD_UPDATE, DatumGetHeapTupleHeader, DatumGetObjectId(), DatumGetPointer(), elog(), ModifyTableContext::epqstate, ERROR, EState::es_epq_active, EState::es_insert_pending_result_relations, ModifyTableContext::estate, EvalPlanQualSetSlot, ExecDelete(), ExecForceStoreHeapTuple(), ExecGetInsertNewTuple(), ExecGetJunkAttribute(), ExecInitInsertProjection(), ExecInitUpdateProjection(), ExecInsert(), ExecLookupResultRelByOid(), ExecMerge(), ExecPendingInserts(), ExecProcessReturning(), ExecProcNode(), ExecUpdate(), fireASTriggers(), fireBSTriggers(), ModifyTableState::fireBSTriggers, ModifyTableContext::GetUpdateNewTuple, HeapTupleHeaderGetDatumLength, internalGetUpdateNewTuple(), InvalidOid, ItemPointerSetInvalid(), ModifyTableState::mt_done, ModifyTableState::mt_epqstate, ModifyTableState::mt_lastResultIndex, ModifyTableState::mt_lastResultOid, ModifyTableState::mt_resultOidAttno, ModifyTableContext::mtstate, NIL, ModifyTableState::operation, outerPlanState, ModifyTableContext::planSlot, ModifyTableState::ps, PlanState::ps_ExprContext, RelationData::rd_rel, ModifyTableContext::relaction, RelationGetRelid, ResetExprContext, ResetPerTupleExprContext, ModifyTableState::resultRelInfo, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_RowIdAttNo, ResultRelInfo::ri_usesFdwDirectModify, SnapshotAny, PlanState::state, HeapTupleData::t_data, HeapTupleData::t_len, HeapTupleData::t_self, HeapTupleData::t_tableOid, table_tuple_fetch_row_version(), TupIsNull, and unlikely.

Referenced by ExecInitModifyTable().

ExecOnConflictUpdate()

static bool ExecOnConflictUpdate ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  conflictTid, TupleTableSlot *  excludedSlot, bool  canSetTag, TupleTableSlot **  returning  )

static

Definition at line 2421 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
    ExprContext *econtext = mtstate->ps.ps_ExprContext;
    Relation    relation = resultRelInfo->ri_RelationDesc;
    ExprState  *onConflictSetWhere = resultRelInfo->ri_onConflict->oc_WhereClause;
    TupleTableSlot *existing = resultRelInfo->ri_onConflict->oc_Existing;
    TM_FailureData tmfd;
    LockTupleMode lockmode;
    TM_Result   test;
    Datum       xminDatum;
    TransactionId xmin;
    bool        isnull;
 
    /* Determine lock mode to use */
    lockmode = ExecUpdateLockMode(context->estate, resultRelInfo);
 
    /*
     * Lock tuple for update.  Don't follow updates when tuple cannot be
     * locked without doing so.  A row locking conflict here means our
     * previous conclusion that the tuple is conclusively committed is not
     * true anymore.
     */
    test = table_tuple_lock(relation, conflictTid,
                            context->estate->es_snapshot,
                            existing, context->estate->es_output_cid,
                            lockmode, LockWaitBlock, 0,
                            &tmfd);
    switch (test)
    {
        case TM_Ok:
            /* success! */
            break;
 
        case TM_Invisible:
 
            /*
             * This can occur when a just inserted tuple is updated again in
             * the same command. E.g. because multiple rows with the same
             * conflicting key values are inserted.
             *
             * This is somewhat similar to the ExecUpdate() TM_SelfModified
             * case.  We do not want to proceed because it would lead to the
             * same row being updated a second time in some unspecified order,
             * and in contrast to plain UPDATEs there's no historical behavior
             * to break.
             *
             * It is the user's responsibility to prevent this situation from
             * occurring.  These problems are why the SQL standard similarly
             * specifies that for SQL MERGE, an exception must be raised in
             * the event of an attempt to update the same row twice.
             */
            xminDatum = slot_getsysattr(existing,
                                        MinTransactionIdAttributeNumber,
                                        &isnull);
            Assert(!isnull);
            xmin = DatumGetTransactionId(xminDatum);
 
            if (TransactionIdIsCurrentTransactionId(xmin))
                ereport(ERROR,
                        (errcode(ERRCODE_CARDINALITY_VIOLATION),
                /* translator: %s is a SQL command name */
                         errmsg("%s command cannot affect row a second time",
                                "ON CONFLICT DO UPDATE"),
                         errhint("Ensure that no rows proposed for insertion within the same command have duplicate constrained values.")));
 
            /* This shouldn't happen */
            elog(ERROR, "attempted to lock invisible tuple");
            break;
 
        case TM_SelfModified:
 
            /*
             * This state should never be reached. As a dirty snapshot is used
             * to find conflicting tuples, speculative insertion wouldn't have
             * seen this row to conflict with.
             */
            elog(ERROR, "unexpected self-updated tuple");
            break;
 
        case TM_Updated:
            if (IsolationUsesXactSnapshot())
                ereport(ERROR,
                        (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                         errmsg("could not serialize access due to concurrent update")));
 
            /*
             * As long as we don't support an UPDATE of INSERT ON CONFLICT for
             * a partitioned table we shouldn't reach to a case where tuple to
             * be lock is moved to another partition due to concurrent update
             * of the partition key.
             */
            Assert(!ItemPointerIndicatesMovedPartitions(&tmfd.ctid));
 
            /*
             * Tell caller to try again from the very start.
             *
             * It does not make sense to use the usual EvalPlanQual() style
             * loop here, as the new version of the row might not conflict
             * anymore, or the conflicting tuple has actually been deleted.
             */
            ExecClearTuple(existing);
            return false;
 
        case TM_Deleted:
            if (IsolationUsesXactSnapshot())
                ereport(ERROR,
                        (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                         errmsg("could not serialize access due to concurrent delete")));
 
            /* see TM_Updated case */
            Assert(!ItemPointerIndicatesMovedPartitions(&tmfd.ctid));
            ExecClearTuple(existing);
            return false;
 
        default:
            elog(ERROR, "unrecognized table_tuple_lock status: %u", test);
    }
 
    /* Success, the tuple is locked. */
 
    /*
     * Verify that the tuple is visible to our MVCC snapshot if the current
     * isolation level mandates that.
     *
     * It's not sufficient to rely on the check within ExecUpdate() as e.g.
     * CONFLICT ... WHERE clause may prevent us from reaching that.
     *
     * This means we only ever continue when a new command in the current
     * transaction could see the row, even though in READ COMMITTED mode the
     * tuple will not be visible according to the current statement's
     * snapshot.  This is in line with the way UPDATE deals with newer tuple
     * versions.
     */
    ExecCheckTupleVisible(context->estate, relation, existing);
 
    /*
     * Make tuple and any needed join variables available to ExecQual and
     * ExecProject.  The EXCLUDED tuple is installed in ecxt_innertuple, while
     * the target's existing tuple is installed in the scantuple.  EXCLUDED
     * has been made to reference INNER_VAR in setrefs.c, but there is no
     * other redirection.
     */
    econtext->ecxt_scantuple = existing;
    econtext->ecxt_innertuple = excludedSlot;
    econtext->ecxt_outertuple = NULL;
 
    if (!ExecQual(onConflictSetWhere, econtext))
    {
        ExecClearTuple(existing);   /* see return below */
        InstrCountFiltered1(&mtstate->ps, 1);
        return true;            /* done with the tuple */
    }
 
    if (resultRelInfo->ri_WithCheckOptions != NIL)
    {
        /*
         * Check target's existing tuple against UPDATE-applicable USING
         * security barrier quals (if any), enforced here as RLS checks/WCOs.
         *
         * The rewriter creates UPDATE RLS checks/WCOs for UPDATE security
         * quals, and stores them as WCOs of "kind" WCO_RLS_CONFLICT_CHECK,
         * but that's almost the extent of its special handling for ON
         * CONFLICT DO UPDATE.
         *
         * The rewriter will also have associated UPDATE applicable straight
         * RLS checks/WCOs for the benefit of the ExecUpdate() call that
         * follows.  INSERTs and UPDATEs naturally have mutually exclusive WCO
         * kinds, so there is no danger of spurious over-enforcement in the
         * INSERT or UPDATE path.
         */
        ExecWithCheckOptions(WCO_RLS_CONFLICT_CHECK, resultRelInfo,
                             existing,
                             mtstate->ps.state);
    }
 
    /* Project the new tuple version */
    ExecProject(resultRelInfo->ri_onConflict->oc_ProjInfo);
 
    /*
     * Note that it is possible that the target tuple has been modified in
     * this session, after the above table_tuple_lock. We choose to not error
     * out in that case, in line with ExecUpdate's treatment of similar cases.
     * This can happen if an UPDATE is triggered from within ExecQual(),
     * ExecWithCheckOptions() or ExecProject() above, e.g. by selecting from a
     * wCTE in the ON CONFLICT's SET.
     */
 
    /* Execute UPDATE with projection */
    *returning = ExecUpdate(context, resultRelInfo,
                            conflictTid, NULL,
                            resultRelInfo->ri_onConflict->oc_ProjSlot,
                            canSetTag);
 
    /*
     * Clear out existing tuple, as there might not be another conflict among
     * the next input rows. Don't want to hold resources till the end of the
     * query.
     */
    ExecClearTuple(existing);
    return true;
}

References Assert(), TM_FailureData::ctid, DatumGetTransactionId(), ExprContext::ecxt_innertuple, ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, elog(), ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errhint(), errmsg(), ERROR, EState::es_output_cid, EState::es_snapshot, ModifyTableContext::estate, ExecCheckTupleVisible(), ExecClearTuple(), ExecProject(), ExecQual(), ExecUpdate(), ExecUpdateLockMode(), ExecWithCheckOptions(), InstrCountFiltered1, IsolationUsesXactSnapshot, ItemPointerIndicatesMovedPartitions(), LockWaitBlock, MinTransactionIdAttributeNumber, ModifyTableContext::mtstate, NIL, OnConflictSetState::oc_Existing, OnConflictSetState::oc_ProjInfo, OnConflictSetState::oc_ProjSlot, OnConflictSetState::oc_WhereClause, ModifyTableState::ps, PlanState::ps_ExprContext, ResultRelInfo::ri_onConflict, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_WithCheckOptions, slot_getsysattr(), PlanState::state, table_tuple_lock(), test(), TM_Deleted, TM_Invisible, TM_Ok, TM_SelfModified, TM_Updated, TransactionIdIsCurrentTransactionId(), and WCO_RLS_CONFLICT_CHECK.

Referenced by ExecInsert().

ExecPendingInserts()

static void ExecPendingInserts ( EState *  estate )

static

Definition at line 1220 of file nodeModifyTable.c.

{
    ListCell   *lc;
 
    foreach(lc, estate->es_insert_pending_result_relations)
    {
        ResultRelInfo *resultRelInfo = (ResultRelInfo *) lfirst(lc);
        ModifyTableState *mtstate = resultRelInfo->ri_ModifyTableState;
 
        Assert(mtstate);
        ExecBatchInsert(mtstate, resultRelInfo,
                        resultRelInfo->ri_Slots,
                        resultRelInfo->ri_PlanSlots,
                        resultRelInfo->ri_NumSlots,
                        estate, mtstate->canSetTag);
        resultRelInfo->ri_NumSlots = 0;
    }
 
    list_free(estate->es_insert_pending_result_relations);
    estate->es_insert_pending_result_relations = NIL;
}

References Assert(), ModifyTableState::canSetTag, EState::es_insert_pending_result_relations, ExecBatchInsert(), lfirst, list_free(), NIL, ResultRelInfo::ri_ModifyTableState, ResultRelInfo::ri_NumSlots, ResultRelInfo::ri_PlanSlots, and ResultRelInfo::ri_Slots.

Referenced by ExecDeletePrologue(), ExecInsert(), ExecModifyTable(), and ExecUpdatePrologue().

ExecPrepareTupleRouting()

static TupleTableSlot * ExecPrepareTupleRouting ( ModifyTableState *  mtstate, EState *  estate, PartitionTupleRouting *  proute, ResultRelInfo *  targetRelInfo, TupleTableSlot *  slot, ResultRelInfo **  partRelInfo  )

static

Definition at line 3444 of file nodeModifyTable.c.

{
    ResultRelInfo *partrel;
    TupleConversionMap *map;
 
    /*
     * Lookup the target partition's ResultRelInfo.  If ExecFindPartition does
     * not find a valid partition for the tuple in 'slot' then an error is
     * raised.  An error may also be raised if the found partition is not a
     * valid target for INSERTs.  This is required since a partitioned table
     * UPDATE to another partition becomes a DELETE+INSERT.
     */
    partrel = ExecFindPartition(mtstate, targetRelInfo, proute, slot, estate);
 
    /*
     * If we're capturing transition tuples, we might need to convert from the
     * partition rowtype to root partitioned table's rowtype.  But if there
     * are no BEFORE triggers on the partition that could change the tuple, we
     * can just remember the original unconverted tuple to avoid a needless
     * round trip conversion.
     */
    if (mtstate->mt_transition_capture != NULL)
    {
        bool        has_before_insert_row_trig;
 
        has_before_insert_row_trig = (partrel->ri_TrigDesc &&
                                      partrel->ri_TrigDesc->trig_insert_before_row);
 
        mtstate->mt_transition_capture->tcs_original_insert_tuple =
            !has_before_insert_row_trig ? slot : NULL;
    }
 
    /*
     * Convert the tuple, if necessary.
     */
    map = ExecGetRootToChildMap(partrel, estate);
    if (map != NULL)
    {
        TupleTableSlot *new_slot = partrel->ri_PartitionTupleSlot;
 
        slot = execute_attr_map_slot(map->attrMap, slot, new_slot);
    }
 
    *partRelInfo = partrel;
    return slot;
}

References TupleConversionMap::attrMap, ExecFindPartition(), ExecGetRootToChildMap(), execute_attr_map_slot(), ModifyTableState::mt_transition_capture, ResultRelInfo::ri_PartitionTupleSlot, ResultRelInfo::ri_TrigDesc, TransitionCaptureState::tcs_original_insert_tuple, and TriggerDesc::trig_insert_before_row.

Referenced by ExecInsert().

ExecProcessReturning()

static TupleTableSlot* ExecProcessReturning ( ResultRelInfo *  resultRelInfo, TupleTableSlot *  tupleSlot, TupleTableSlot *  planSlot  )

static

Definition at line 272 of file nodeModifyTable.c.

{
    ProjectionInfo *projectReturning = resultRelInfo->ri_projectReturning;
    ExprContext *econtext = projectReturning->pi_exprContext;
 
    /* Make tuple and any needed join variables available to ExecProject */
    if (tupleSlot)
        econtext->ecxt_scantuple = tupleSlot;
    econtext->ecxt_outertuple = planSlot;
 
    /*
     * RETURNING expressions might reference the tableoid column, so
     * reinitialize tts_tableOid before evaluating them.
     */
    econtext->ecxt_scantuple->tts_tableOid =
        RelationGetRelid(resultRelInfo->ri_RelationDesc);
 
    /* Compute the RETURNING expressions */
    return ExecProject(projectReturning);
}

References ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, ExecProject(), ProjectionInfo::pi_exprContext, RelationGetRelid, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, and TupleTableSlot::tts_tableOid.

Referenced by ExecDelete(), ExecInsert(), ExecModifyTable(), and ExecUpdate().

ExecReScanModifyTable()

void ExecReScanModifyTable

(

ModifyTableState *

node

)

Definition at line 4444 of file nodeModifyTable.c.

{
    /*
     * Currently, we don't need to support rescan on ModifyTable nodes. The
     * semantics of that would be a bit debatable anyway.
     */
    elog(ERROR, "ExecReScanModifyTable is not implemented");
}

References elog(), and ERROR.

Referenced by ExecReScan().

ExecSetupTransitionCaptureState()

static void ExecSetupTransitionCaptureState ( ModifyTableState *  mtstate, EState *  estate  )

static

Definition at line 3415 of file nodeModifyTable.c.

{
    ModifyTable *plan = (ModifyTable *) mtstate->ps.plan;
    ResultRelInfo *targetRelInfo = mtstate->rootResultRelInfo;
 
    /* Check for transition tables on the directly targeted relation. */
    mtstate->mt_transition_capture =
        MakeTransitionCaptureState(targetRelInfo->ri_TrigDesc,
                                   RelationGetRelid(targetRelInfo->ri_RelationDesc),
                                   mtstate->operation);
    if (plan->operation == CMD_INSERT &&
        plan->onConflictAction == ONCONFLICT_UPDATE)
        mtstate->mt_oc_transition_capture =
            MakeTransitionCaptureState(targetRelInfo->ri_TrigDesc,
                                       RelationGetRelid(targetRelInfo->ri_RelationDesc),
                                       CMD_UPDATE);
}

References CMD_INSERT, CMD_UPDATE, MakeTransitionCaptureState(), ModifyTableState::mt_oc_transition_capture, ModifyTableState::mt_transition_capture, ONCONFLICT_UPDATE, ModifyTable::onConflictAction, ModifyTableState::operation, ModifyTable::operation, PlanState::plan, ModifyTableState::ps, RelationGetRelid, and ModifyTableState::rootResultRelInfo.

Referenced by ExecInitModifyTable().

ExecUpdate()

static TupleTableSlot* ExecUpdate ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot *  slot, bool  canSetTag  )

static

Definition at line 2182 of file nodeModifyTable.c.

{
    EState     *estate = context->estate;
    Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    UpdateContext updateCxt = {0};
    List       *recheckIndexes = NIL;
    TM_Result   result;
 
    /*
     * abort the operation if not running transactions
     */
    if (IsBootstrapProcessingMode())
        elog(ERROR, "cannot UPDATE during bootstrap");
 
    /*
     * Prepare for the update.  This includes BEFORE ROW triggers, so we're
     * done if it says we are.
     */
    if (!ExecUpdatePrologue(context, resultRelInfo, tupleid, oldtuple, slot))
        return NULL;
 
    /* INSTEAD OF ROW UPDATE Triggers */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_update_instead_row)
    {
        if (!ExecIRUpdateTriggers(estate, resultRelInfo,
                                  oldtuple, slot))
            return NULL;        /* "do nothing" */
    }
    else if (resultRelInfo->ri_FdwRoutine)
    {
        ExecUpdatePrepareSlot(resultRelInfo, slot, estate);
 
        /*
         * update in foreign table: let the FDW do it
         */
        slot = resultRelInfo->ri_FdwRoutine->ExecForeignUpdate(estate,
                                                               resultRelInfo,
                                                               slot,
                                                               context->planSlot);
 
        if (slot == NULL)       /* "do nothing" */
            return NULL;
 
        /*
         * AFTER ROW Triggers or RETURNING expressions might reference the
         * tableoid column, so (re-)initialize tts_tableOid before evaluating
         * them.  (This covers the case where the FDW replaced the slot.)
         */
        slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
    }
    else
    {
        /* Fill in the slot appropriately */
        ExecUpdatePrepareSlot(resultRelInfo, slot, estate);
 
redo_act:
        result = ExecUpdateAct(context, resultRelInfo, tupleid, oldtuple, slot,
                               canSetTag, &updateCxt);
 
        /*
         * If ExecUpdateAct reports that a cross-partition update was done,
         * then the RETURNING tuple (if any) has been projected and there's
         * nothing else for us to do.
         */
        if (updateCxt.crossPartUpdate)
            return context->cpUpdateReturningSlot;
 
        switch (result)
        {
            case TM_SelfModified:
 
                /*
                 * The target tuple was already updated or deleted by the
                 * current command, or by a later command in the current
                 * transaction.  The former case is possible in a join UPDATE
                 * where multiple tuples join to the same target tuple. This
                 * is pretty questionable, but Postgres has always allowed it:
                 * we just execute the first update action and ignore
                 * additional update attempts.
                 *
                 * The latter case arises if the tuple is modified by a
                 * command in a BEFORE trigger, or perhaps by a command in a
                 * volatile function used in the query.  In such situations we
                 * should not ignore the update, but it is equally unsafe to
                 * proceed.  We don't want to discard the original UPDATE
                 * while keeping the triggered actions based on it; and we
                 * have no principled way to merge this update with the
                 * previous ones.  So throwing an error is the only safe
                 * course.
                 *
                 * If a trigger actually intends this type of interaction, it
                 * can re-execute the UPDATE (assuming it can figure out how)
                 * and then return NULL to cancel the outer update.
                 */
                if (context->tmfd.cmax != estate->es_output_cid)
                    ereport(ERROR,
                            (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
                             errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
                             errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
 
                /* Else, already updated by self; nothing to do */
                return NULL;
 
            case TM_Ok:
                break;
 
            case TM_Updated:
                {
                    TupleTableSlot *inputslot;
                    TupleTableSlot *epqslot;
                    TupleTableSlot *oldSlot;
 
                    if (IsolationUsesXactSnapshot())
                        ereport(ERROR,
                                (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                                 errmsg("could not serialize access due to concurrent update")));
 
                    /*
                     * Already know that we're going to need to do EPQ, so
                     * fetch tuple directly into the right slot.
                     */
                    inputslot = EvalPlanQualSlot(context->epqstate, resultRelationDesc,
                                                 resultRelInfo->ri_RangeTableIndex);
 
                    result = table_tuple_lock(resultRelationDesc, tupleid,
                                              estate->es_snapshot,
                                              inputslot, estate->es_output_cid,
                                              updateCxt.lockmode, LockWaitBlock,
                                              TUPLE_LOCK_FLAG_FIND_LAST_VERSION,
                                              &context->tmfd);
 
                    switch (result)
                    {
                        case TM_Ok:
                            Assert(context->tmfd.traversed);
 
                            epqslot = EvalPlanQual(context->epqstate,
                                                   resultRelationDesc,
                                                   resultRelInfo->ri_RangeTableIndex,
                                                   inputslot);
                            if (TupIsNull(epqslot))
                                /* Tuple not passing quals anymore, exiting... */
                                return NULL;
 
                            /* Make sure ri_oldTupleSlot is initialized. */
                            if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
                                ExecInitUpdateProjection(context->mtstate,
                                                         resultRelInfo);
 
                            /* Fetch the most recent version of old tuple. */
                            oldSlot = resultRelInfo->ri_oldTupleSlot;
                            if (!table_tuple_fetch_row_version(resultRelationDesc,
                                                               tupleid,
                                                               SnapshotAny,
                                                               oldSlot))
                                elog(ERROR, "failed to fetch tuple being updated");
                            slot = ExecGetUpdateNewTuple(resultRelInfo,
                                                         epqslot, oldSlot);
                            goto redo_act;
 
                        case TM_Deleted:
                            /* tuple already deleted; nothing to do */
                            return NULL;
 
                        case TM_SelfModified:
 
                            /*
                             * This can be reached when following an update
                             * chain from a tuple updated by another session,
                             * reaching a tuple that was already updated in
                             * this transaction. If previously modified by
                             * this command, ignore the redundant update,
                             * otherwise error out.
                             *
                             * See also TM_SelfModified response to
                             * table_tuple_update() above.
                             */
                            if (context->tmfd.cmax != estate->es_output_cid)
                                ereport(ERROR,
                                        (errcode(ERRCODE_TRIGGERED_DATA_CHANGE_VIOLATION),
                                         errmsg("tuple to be updated was already modified by an operation triggered by the current command"),
                                         errhint("Consider using an AFTER trigger instead of a BEFORE trigger to propagate changes to other rows.")));
                            return NULL;
 
                        default:
                            /* see table_tuple_lock call in ExecDelete() */
                            elog(ERROR, "unexpected table_tuple_lock status: %u",
                                 result);
                            return NULL;
                    }
                }
 
                break;
 
            case TM_Deleted:
                if (IsolationUsesXactSnapshot())
                    ereport(ERROR,
                            (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                             errmsg("could not serialize access due to concurrent delete")));
                /* tuple already deleted; nothing to do */
                return NULL;
 
            default:
                elog(ERROR, "unrecognized table_tuple_update status: %u",
                     result);
                return NULL;
        }
    }
 
    if (canSetTag)
        (estate->es_processed)++;
 
    ExecUpdateEpilogue(context, &updateCxt, resultRelInfo, tupleid, oldtuple,
                       slot, recheckIndexes);
 
    list_free(recheckIndexes);
 
    /* Process RETURNING if present */
    if (resultRelInfo->ri_projectReturning)
        return ExecProcessReturning(resultRelInfo, slot, context->planSlot);
 
    return NULL;
}

References Assert(), TM_FailureData::cmax, ModifyTableContext::cpUpdateReturningSlot, UpdateContext::crossPartUpdate, elog(), ModifyTableContext::epqstate, ereport, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, errhint(), errmsg(), ERROR, EState::es_output_cid, EState::es_processed, EState::es_snapshot, ModifyTableContext::estate, EvalPlanQual(), EvalPlanQualSlot(), FdwRoutine::ExecForeignUpdate, ExecGetUpdateNewTuple(), ExecInitUpdateProjection(), ExecIRUpdateTriggers(), ExecProcessReturning(), ExecUpdateAct(), ExecUpdateEpilogue(), ExecUpdatePrepareSlot(), ExecUpdatePrologue(), IsBootstrapProcessingMode, IsolationUsesXactSnapshot, list_free(), UpdateContext::lockmode, LockWaitBlock, ModifyTableContext::mtstate, NIL, ModifyTableContext::planSlot, RelationGetRelid, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_oldTupleSlot, ResultRelInfo::ri_projectNewInfoValid, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RangeTableIndex, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, SnapshotAny, table_tuple_fetch_row_version(), table_tuple_lock(), TM_Deleted, TM_Ok, TM_SelfModified, TM_Updated, ModifyTableContext::tmfd, TM_FailureData::traversed, TriggerDesc::trig_update_instead_row, TupleTableSlot::tts_tableOid, TupIsNull, TUPLE_LOCK_FLAG_FIND_LAST_VERSION, and unlikely.

Referenced by ExecModifyTable(), and ExecOnConflictUpdate().

ExecUpdateAct()

static TM_Result ExecUpdateAct ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot *  slot, bool  canSetTag, UpdateContext *  updateCxt  )

static

Definition at line 1897 of file nodeModifyTable.c.

{
    EState     *estate = context->estate;
    Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
    bool        partition_constraint_failed;
    TM_Result   result;
 
    updateCxt->crossPartUpdate = false;
 
    /*
     * If we generate a new candidate tuple after EvalPlanQual testing, we
     * must loop back here and recheck any RLS policies and constraints. (We
     * don't need to redo triggers, however.  If there are any BEFORE triggers
     * then trigger.c will have done table_tuple_lock to lock the correct
     * tuple, so there's no need to do them again.)
     */
lreplace:
 
    /* ensure slot is independent, consider e.g. EPQ */
    ExecMaterializeSlot(slot);
 
    /*
     * If partition constraint fails, this row might get moved to another
     * partition, in which case we should check the RLS CHECK policy just
     * before inserting into the new partition, rather than doing it here.
     * This is because a trigger on that partition might again change the row.
     * So skip the WCO checks if the partition constraint fails.
     */
    partition_constraint_failed =
        resultRelationDesc->rd_rel->relispartition &&
        !ExecPartitionCheck(resultRelInfo, slot, estate, false);
 
    /* Check any RLS UPDATE WITH CHECK policies */
    if (!partition_constraint_failed &&
        resultRelInfo->ri_WithCheckOptions != NIL)
    {
        /*
         * ExecWithCheckOptions() will skip any WCOs which are not of the kind
         * we are looking for at this point.
         */
        ExecWithCheckOptions(WCO_RLS_UPDATE_CHECK,
                             resultRelInfo, slot, estate);
    }
 
    /*
     * If a partition check failed, try to move the row into the right
     * partition.
     */
    if (partition_constraint_failed)
    {
        TupleTableSlot *inserted_tuple;
        ResultRelInfo *insert_destrel = NULL;
 
        /*
         * ExecCrossPartitionUpdate will first DELETE the row from the
         * partition it's currently in and then insert it back into the root
         * table, which will re-route it to the correct partition.  However,
         * if the tuple has been concurrently updated, a retry is needed.
         */
        if (ExecCrossPartitionUpdate(context, resultRelInfo,
                                     tupleid, oldtuple, slot,
                                     canSetTag, updateCxt,
                                     &inserted_tuple,
                                     &insert_destrel))
        {
            /* success! */
            updateCxt->updated = true;
            updateCxt->crossPartUpdate = true;
 
            /*
             * If the partitioned table being updated is referenced in foreign
             * keys, queue up trigger events to check that none of them were
             * violated.  No special treatment is needed in
             * non-cross-partition update situations, because the leaf
             * partition's AR update triggers will take care of that.  During
             * cross-partition updates implemented as delete on the source
             * partition followed by insert on the destination partition,
             * AR-UPDATE triggers of the root table (that is, the table
             * mentioned in the query) must be fired.
             *
             * NULL insert_destrel means that the move failed to occur, that
             * is, the update failed, so no need to anything in that case.
             */
            if (insert_destrel &&
                resultRelInfo->ri_TrigDesc &&
                resultRelInfo->ri_TrigDesc->trig_update_after_row)
                ExecCrossPartitionUpdateForeignKey(context,
                                                   resultRelInfo,
                                                   insert_destrel,
                                                   tupleid, slot,
                                                   inserted_tuple);
 
            return TM_Ok;
        }
 
        /*
         * No luck, a retry is needed.  If running MERGE, we do not do so
         * here; instead let it handle that on its own rules.
         */
        if (context->relaction != NULL)
            return TM_Updated;
 
        /*
         * ExecCrossPartitionUpdate installed an updated version of the new
         * tuple in the retry slot; start over.
         */
        slot = context->cpUpdateRetrySlot;
        goto lreplace;
    }
 
    /*
     * Check the constraints of the tuple.  We've already checked the
     * partition constraint above; however, we must still ensure the tuple
     * passes all other constraints, so we will call ExecConstraints() and
     * have it validate all remaining checks.
     */
    if (resultRelationDesc->rd_att->constr)
        ExecConstraints(resultRelInfo, slot, estate);
 
    /*
     * replace the heap tuple
     *
     * Note: if es_crosscheck_snapshot isn't InvalidSnapshot, we check that
     * the row to be updated is visible to that snapshot, and throw a
     * can't-serialize error if not. This is a special-case behavior needed
     * for referential integrity updates in transaction-snapshot mode
     * transactions.
     */
    result = table_tuple_update(resultRelationDesc, tupleid, slot,
                                estate->es_output_cid,
                                estate->es_snapshot,
                                estate->es_crosscheck_snapshot,
                                true /* wait for commit */ ,
                                &context->tmfd, &updateCxt->lockmode,
                                &updateCxt->updateIndexes);
    if (result == TM_Ok)
        updateCxt->updated = true;
 
    return result;
}

References TupleDescData::constr, ModifyTableContext::cpUpdateRetrySlot, UpdateContext::crossPartUpdate, EState::es_crosscheck_snapshot, EState::es_output_cid, EState::es_snapshot, ModifyTableContext::estate, ExecConstraints(), ExecCrossPartitionUpdate(), ExecCrossPartitionUpdateForeignKey(), ExecMaterializeSlot(), ExecPartitionCheck(), ExecWithCheckOptions(), UpdateContext::lockmode, NIL, RelationData::rd_att, RelationData::rd_rel, ModifyTableContext::relaction, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, ResultRelInfo::ri_WithCheckOptions, table_tuple_update(), TM_Ok, TM_Updated, ModifyTableContext::tmfd, TriggerDesc::trig_update_after_row, UpdateContext::updated, UpdateContext::updateIndexes, and WCO_RLS_UPDATE_CHECK.

Referenced by ExecMergeMatched(), and ExecUpdate().

ExecUpdateEpilogue()

static void ExecUpdateEpilogue ( ModifyTableContext *  context, UpdateContext *  updateCxt, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot *  slot, List *  recheckIndexes  )

static

Definition at line 2047 of file nodeModifyTable.c.

{
    ModifyTableState *mtstate = context->mtstate;
 
    /* insert index entries for tuple if necessary */
    if (resultRelInfo->ri_NumIndices > 0 && updateCxt->updateIndexes)
        recheckIndexes = ExecInsertIndexTuples(resultRelInfo,
                                               slot, context->estate,
                                               true, false,
                                               NULL, NIL);
 
    /* AFTER ROW UPDATE Triggers */
    ExecARUpdateTriggers(context->estate, resultRelInfo,
                         NULL, NULL,
                         tupleid, oldtuple, slot,
                         recheckIndexes,
                         mtstate->operation == CMD_INSERT ?
                         mtstate->mt_oc_transition_capture :
                         mtstate->mt_transition_capture,
                         false);
 
    /*
     * Check any WITH CHECK OPTION constraints from parent views.  We are
     * required to do this after testing all constraints and uniqueness
     * violations per the SQL spec, so we do it after actually updating the
     * record in the heap and all indexes.
     *
     * ExecWithCheckOptions() will skip any WCOs which are not of the kind we
     * are looking for at this point.
     */
    if (resultRelInfo->ri_WithCheckOptions != NIL)
        ExecWithCheckOptions(WCO_VIEW_CHECK, resultRelInfo,
                             slot, context->estate);
}

References CMD_INSERT, ModifyTableContext::estate, ExecARUpdateTriggers(), ExecInsertIndexTuples(), ExecWithCheckOptions(), ModifyTableState::mt_oc_transition_capture, ModifyTableState::mt_transition_capture, ModifyTableContext::mtstate, NIL, ModifyTableState::operation, ResultRelInfo::ri_NumIndices, ResultRelInfo::ri_WithCheckOptions, UpdateContext::updateIndexes, and WCO_VIEW_CHECK.

Referenced by ExecMergeMatched(), and ExecUpdate().

ExecUpdatePrepareSlot()

static void ExecUpdatePrepareSlot ( ResultRelInfo *  resultRelInfo, TupleTableSlot *  slot, EState *  estate  )

static

Definition at line 1859 of file nodeModifyTable.c.

{
    Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
    /*
     * Constraints and GENERATED expressions might reference the tableoid
     * column, so (re-)initialize tts_tableOid before evaluating them.
     */
    slot->tts_tableOid = RelationGetRelid(resultRelationDesc);
 
    /*
     * Compute stored generated columns
     */
    if (resultRelationDesc->rd_att->constr &&
        resultRelationDesc->rd_att->constr->has_generated_stored)
        ExecComputeStoredGenerated(resultRelInfo, estate, slot,
                                   CMD_UPDATE);
}

References CMD_UPDATE, TupleDescData::constr, ExecComputeStoredGenerated(), TupleConstr::has_generated_stored, RelationData::rd_att, RelationGetRelid, ResultRelInfo::ri_RelationDesc, and TupleTableSlot::tts_tableOid.

Referenced by ExecMergeMatched(), and ExecUpdate().

ExecUpdatePrologue()

static bool ExecUpdatePrologue ( ModifyTableContext *  context, ResultRelInfo *  resultRelInfo, ItemPointer  tupleid, HeapTuple  oldtuple, TupleTableSlot *  slot  )

static

Definition at line 1822 of file nodeModifyTable.c.

{
    Relation    resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
    ExecMaterializeSlot(slot);
 
    /*
     * Open the table's indexes, if we have not done so already, so that we
     * can add new index entries for the updated tuple.
     */
    if (resultRelationDesc->rd_rel->relhasindex &&
        resultRelInfo->ri_IndexRelationDescs == NULL)
        ExecOpenIndices(resultRelInfo, false);
 
    /* BEFORE ROW UPDATE triggers */
    if (resultRelInfo->ri_TrigDesc &&
        resultRelInfo->ri_TrigDesc->trig_update_before_row)
    {
        /* Flush any pending inserts, so rows are visible to the triggers */
        if (context->estate->es_insert_pending_result_relations != NIL)
            ExecPendingInserts(context->estate);
 
        return ExecBRUpdateTriggers(context->estate, context->epqstate,
                                    resultRelInfo, tupleid, oldtuple, slot,
                                    &context->tmfd);
    }
 
    return true;
}

References ModifyTableContext::epqstate, EState::es_insert_pending_result_relations, ModifyTableContext::estate, ExecBRUpdateTriggers(), ExecMaterializeSlot(), ExecOpenIndices(), ExecPendingInserts(), NIL, RelationData::rd_rel, ResultRelInfo::ri_IndexRelationDescs, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, ModifyTableContext::tmfd, and TriggerDesc::trig_update_before_row.

Referenced by ExecMergeMatched(), and ExecUpdate().

fireASTriggers()

static void fireASTriggers ( ModifyTableState *  node )

static

Definition at line 3370 of file nodeModifyTable.c.

{
    ModifyTable *plan = (ModifyTable *) node->ps.plan;
    ResultRelInfo *resultRelInfo = node->rootResultRelInfo;
 
    switch (node->operation)
    {
        case CMD_INSERT:
            if (plan->onConflictAction == ONCONFLICT_UPDATE)
                ExecASUpdateTriggers(node->ps.state,
                                     resultRelInfo,
                                     node->mt_oc_transition_capture);
            ExecASInsertTriggers(node->ps.state, resultRelInfo,
                                 node->mt_transition_capture);
            break;
        case CMD_UPDATE:
            ExecASUpdateTriggers(node->ps.state, resultRelInfo,
                                 node->mt_transition_capture);
            break;
        case CMD_DELETE:
            ExecASDeleteTriggers(node->ps.state, resultRelInfo,
                                 node->mt_transition_capture);
            break;
        case CMD_MERGE:
            if (node->mt_merge_subcommands & MERGE_DELETE)
                ExecASDeleteTriggers(node->ps.state, resultRelInfo,
                                     node->mt_transition_capture);
            if (node->mt_merge_subcommands & MERGE_UPDATE)
                ExecASUpdateTriggers(node->ps.state, resultRelInfo,
                                     node->mt_transition_capture);
            if (node->mt_merge_subcommands & MERGE_INSERT)
                ExecASInsertTriggers(node->ps.state, resultRelInfo,
                                     node->mt_transition_capture);
            break;
        default:
            elog(ERROR, "unknown operation");
            break;
    }
}

References CMD_DELETE, CMD_INSERT, CMD_MERGE, CMD_UPDATE, elog(), ERROR, ExecASDeleteTriggers(), ExecASInsertTriggers(), ExecASUpdateTriggers(), MERGE_DELETE, MERGE_INSERT, MERGE_UPDATE, ModifyTableState::mt_merge_subcommands, ModifyTableState::mt_oc_transition_capture, ModifyTableState::mt_transition_capture, ONCONFLICT_UPDATE, ModifyTable::onConflictAction, ModifyTableState::operation, PlanState::plan, ModifyTableState::ps, ModifyTableState::rootResultRelInfo, and PlanState::state.

Referenced by ExecModifyTable().

fireBSTriggers()

static void fireBSTriggers ( ModifyTableState *  node )

static

Definition at line 3333 of file nodeModifyTable.c.

{
    ModifyTable *plan = (ModifyTable *) node->ps.plan;
    ResultRelInfo *resultRelInfo = node->rootResultRelInfo;
 
    switch (node->operation)
    {
        case CMD_INSERT:
            ExecBSInsertTriggers(node->ps.state, resultRelInfo);
            if (plan->onConflictAction == ONCONFLICT_UPDATE)
                ExecBSUpdateTriggers(node->ps.state,
                                     resultRelInfo);
            break;
        case CMD_UPDATE:
            ExecBSUpdateTriggers(node->ps.state, resultRelInfo);
            break;
        case CMD_DELETE:
            ExecBSDeleteTriggers(node->ps.state, resultRelInfo);
            break;
        case CMD_MERGE:
            if (node->