#include "postgres.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "executor/nodeModifyTable.h"
#include "foreign/fdwapi.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "parser/parsetree.h"
#include "storage/bufmgr.h"
#include "storage/lmgr.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/tqual.h"

Include dependency graph for nodeModifyTable.c:

Functions
static bool	ExecOnConflictUpdate (ModifyTableState mtstate, ResultRelInfo resultRelInfo, ItemPointer conflictTid, TupleTableSlot planSlot, TupleTableSlot excludedSlot, EState estate, bool canSetTag, TupleTableSlot *returning)

static void	ExecCheckPlanOutput (Relation resultRel, List *targetList)

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

static void	ExecCheckHeapTupleVisible (EState *estate, HeapTuple tuple, Buffer buffer)

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

static TupleTableSlot *	ExecInsert (ModifyTableState mtstate, TupleTableSlot slot, TupleTableSlot planSlot, List arbiterIndexes, OnConflictAction onconflict, EState *estate, bool canSetTag)

static TupleTableSlot *	ExecDelete (ModifyTableState mtstate, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot planSlot, EPQState epqstate, EState estate, bool canSetTag)

static TupleTableSlot *	ExecUpdate (ModifyTableState mtstate, ItemPointer tupleid, HeapTuple oldtuple, TupleTableSlot slot, TupleTableSlot planSlot, EPQState epqstate, EState *estate, bool canSetTag)

static void	fireBSTriggers (ModifyTableState *node)

static ResultRelInfo *	getASTriggerResultRelInfo (ModifyTableState *node)

static void	fireASTriggers (ModifyTableState *node)

static void	ExecSetupTransitionCaptureState (ModifyTableState mtstate, EState estate)

TupleTableSlot *	ExecModifyTable (ModifyTableState *node)

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

void	ExecEndModifyTable (ModifyTableState *node)

void	ExecReScanModifyTable (ModifyTableState *node)

Function Documentation

static void ExecCheckHeapTupleVisible	(	EState *	estate,
		HeapTuple	tuple,
		Buffer	buffer
	)

static

Definition at line 191 of file nodeModifyTable.c.

References BUFFER_LOCK_SHARE, BUFFER_LOCK_UNLOCK, ereport, errcode(), errmsg(), ERROR, EState::es_snapshot, HeapTupleHeaderGetXmin, HeapTupleSatisfiesVisibility, IsolationUsesXactSnapshot, LockBuffer(), HeapTupleData::t_data, and TransactionIdIsCurrentTransactionId().

Referenced by ExecCheckTIDVisible(), and ExecOnConflictUpdate().

 {
     if (!IsolationUsesXactSnapshot())
         return;
 
     /*
      * We need buffer pin and lock to call HeapTupleSatisfiesVisibility.
      * Caller should be holding pin, but not lock.
      */
     LockBuffer(buffer, BUFFER_LOCK_SHARE);
     if (!HeapTupleSatisfiesVisibility(tuple, estate->es_snapshot, buffer))
     {
         /*
          * 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(HeapTupleHeaderGetXmin(tuple->t_data)))
             ereport(ERROR,
                     (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                      errmsg("could not serialize access due to concurrent update")));
     }
     LockBuffer(buffer, BUFFER_LOCK_UNLOCK);
 }

static void ExecCheckPlanOutput	(	Relation	resultRel,
		List *	targetList
	)

static

Definition at line 79 of file nodeModifyTable.c.

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

Referenced by ExecInitModifyTable().

 {
     TupleDesc   resultDesc = RelationGetDescr(resultRel);
     int         attno = 0;
     ListCell   *lc;
 
     foreach(lc, targetList)
     {
         TargetEntry *tle = (TargetEntry *) lfirst(lc);
         Form_pg_attribute attr;
 
         if (tle->resjunk)
             continue;           /* ignore junk tlist items */
 
         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 = resultDesc->attrs[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.")));
 }

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

static

Definition at line 223 of file nodeModifyTable.c.

References buffer, elog, ERROR, ExecCheckHeapTupleVisible(), heap_fetch(), IsolationUsesXactSnapshot, NULL, ReleaseBuffer(), ResultRelInfo::ri_RelationDesc, SnapshotAny, and HeapTupleData::t_self.

Referenced by ExecInsert().

 {
     Relation    rel = relinfo->ri_RelationDesc;
     Buffer      buffer;
     HeapTupleData tuple;
 
     /* Redundantly check isolation level */
     if (!IsolationUsesXactSnapshot())
         return;
 
     tuple.t_self = *tid;
     if (!heap_fetch(rel, SnapshotAny, &tuple, &buffer, false, NULL))
         elog(ERROR, "failed to fetch conflicting tuple for ON CONFLICT");
     ExecCheckHeapTupleVisible(estate, &tuple, buffer);
     ReleaseBuffer(buffer);
 }

static TupleTableSlot* ExecDelete	(	ModifyTableState *	mtstate,
		ItemPointer	tupleid,
		HeapTuple	oldtuple,
		TupleTableSlot *	planSlot,
		EPQState *	epqstate,
		EState *	estate,
		bool	canSetTag
	)

static

Definition at line 670 of file nodeModifyTable.c.

References Assert, BufferIsValid, HeapUpdateFailureData::cmax, HeapUpdateFailureData::ctid, elog, ereport, errcode(), errhint(), errmsg(), ERROR, EState::es_crosscheck_snapshot, EState::es_output_cid, EState::es_processed, EState::es_result_relation_info, EState::es_trig_tuple_slot, EvalPlanQual(), ExecARDeleteTriggers(), ExecBRDeleteTriggers(), ExecClearTuple(), FdwRoutine::ExecForeignDelete, ExecIRDeleteTriggers(), ExecMaterializeSlot(), ExecProcessReturning(), ExecSetSlotDescriptor(), ExecStoreAllNullTuple(), ExecStoreTuple(), heap_delete(), heap_fetch(), HeapTupleMayBeUpdated, HeapTupleSelfUpdated, HeapTupleUpdated, InvalidBuffer, IsolationUsesXactSnapshot, ItemPointerEquals(), LockTupleExclusive, ModifyTableState::mt_transition_capture, NULL, RelationGetDescr, RelationGetRelid, ReleaseBuffer(), result, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RangeTableIndex, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, SnapshotAny, HeapTupleData::t_self, HeapTupleData::t_tableOid, TriggerDesc::trig_delete_before_row, TriggerDesc::trig_delete_instead_row, TupleTableSlot::tts_isempty, TupleTableSlot::tts_tupleDescriptor, TupIsNull, and HeapUpdateFailureData::xmax.

Referenced by ExecModifyTable().

 {
     ResultRelInfo *resultRelInfo;
     Relation    resultRelationDesc;
     HTSU_Result result;
     HeapUpdateFailureData hufd;
     TupleTableSlot *slot = NULL;
 
     /*
      * get information on the (current) result relation
      */
     resultRelInfo = estate->es_result_relation_info;
     resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
     /* BEFORE ROW DELETE Triggers */
     if (resultRelInfo->ri_TrigDesc &&
         resultRelInfo->ri_TrigDesc->trig_delete_before_row)
     {
         bool        dodelete;
 
         dodelete = ExecBRDeleteTriggers(estate, epqstate, resultRelInfo,
                                         tupleid, oldtuple);
 
         if (!dodelete)          /* "do nothing" */
             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)
     {
         HeapTuple   tuple;
 
         /*
          * delete from foreign table: let the FDW do it
          *
          * We offer the trigger tuple slot as a place to store RETURNING data,
          * although the FDW can return some other slot if it wants.  Set up
          * the slot's tupdesc so the FDW doesn't need to do that for itself.
          */
         slot = estate->es_trig_tuple_slot;
         if (slot->tts_tupleDescriptor != RelationGetDescr(resultRelationDesc))
             ExecSetSlotDescriptor(slot, RelationGetDescr(resultRelationDesc));
 
         slot = resultRelInfo->ri_FdwRoutine->ExecForeignDelete(estate,
                                                                resultRelInfo,
                                                                slot,
                                                                planSlot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /*
          * RETURNING expressions might reference the tableoid column, so
          * initialize t_tableOid before evaluating them.
          */
         if (slot->tts_isempty)
             ExecStoreAllNullTuple(slot);
         tuple = ExecMaterializeSlot(slot);
         tuple->t_tableOid = RelationGetRelid(resultRelationDesc);
     }
     else
     {
         /*
          * delete the tuple
          *
          * Note: if 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 = heap_delete(resultRelationDesc, tupleid,
                              estate->es_output_cid,
                              estate->es_crosscheck_snapshot,
                              true /* wait for commit */ ,
                              &hufd);
         switch (result)
         {
             case HeapTupleSelfUpdated:
 
                 /*
                  * 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 (hufd.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 deleted by self; nothing to do */
                 return NULL;
 
             case HeapTupleMayBeUpdated:
                 break;
 
             case HeapTupleUpdated:
                 if (IsolationUsesXactSnapshot())
                     ereport(ERROR,
                             (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                              errmsg("could not serialize access due to concurrent update")));
                 if (!ItemPointerEquals(tupleid, &hufd.ctid))
                 {
                     TupleTableSlot *epqslot;
 
                     epqslot = EvalPlanQual(estate,
                                            epqstate,
                                            resultRelationDesc,
                                            resultRelInfo->ri_RangeTableIndex,
                                            LockTupleExclusive,
                                            &hufd.ctid,
                                            hufd.xmax);
                     if (!TupIsNull(epqslot))
                     {
                         *tupleid = hufd.ctid;
                         goto ldelete;
                     }
                 }
                 /* tuple already deleted; nothing to do */
                 return NULL;
 
             default:
                 elog(ERROR, "unrecognized heap_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)++;
 
     /* AFTER ROW DELETE Triggers */
     ExecARDeleteTriggers(estate, resultRelInfo, tupleid, oldtuple,
                          mtstate->mt_transition_capture);
 
     /* Process RETURNING if present */
     if (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;
         HeapTupleData deltuple;
         Buffer      delbuffer;
 
         if (resultRelInfo->ri_FdwRoutine)
         {
             /* FDW must have provided a slot containing the deleted row */
             Assert(!TupIsNull(slot));
             delbuffer = InvalidBuffer;
         }
         else
         {
             slot = estate->es_trig_tuple_slot;
             if (oldtuple != NULL)
             {
                 deltuple = *oldtuple;
                 delbuffer = InvalidBuffer;
             }
             else
             {
                 deltuple.t_self = *tupleid;
                 if (!heap_fetch(resultRelationDesc, SnapshotAny,
                                 &deltuple, &delbuffer, false, NULL))
                     elog(ERROR, "failed to fetch deleted tuple for DELETE RETURNING");
             }
 
             if (slot->tts_tupleDescriptor != RelationGetDescr(resultRelationDesc))
                 ExecSetSlotDescriptor(slot, RelationGetDescr(resultRelationDesc));
             ExecStoreTuple(&deltuple, slot, InvalidBuffer, false);
         }
 
         rslot = ExecProcessReturning(resultRelInfo, slot, planSlot);
 
         /*
          * Before releasing the target tuple again, make sure rslot has a
          * local copy of any pass-by-reference values.
          */
         ExecMaterializeSlot(rslot);
 
         ExecClearTuple(slot);
         if (BufferIsValid(delbuffer))
             ReleaseBuffer(delbuffer);
 
         return rslot;
     }
 
     return NULL;
 }

void ExecEndModifyTable ( ModifyTableState * node )

Definition at line 2308 of file nodeModifyTable.c.

Referenced by ExecEndNode().

 {
     int         i;
 
     /* Free transition tables */
     if (node->mt_transition_capture != NULL)
         DestroyTransitionCaptureState(node->mt_transition_capture);
 
     /*
      * Allow any FDWs to shut down
      */
     for (i = 0; i < node->mt_nplans; i++)
     {
         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);
     }
 
     /*
      * Close all the partitioned tables, leaf partitions, and their indices
      *
      * Remember node->mt_partition_dispatch_info[0] corresponds to the root
      * partitioned table, which we must not try to close, because it is the
      * main target table of the query that will be closed by ExecEndPlan().
      * Also, tupslot is NULL for the root partitioned table.
      */
     for (i = 1; i < node->mt_num_dispatch; i++)
     {
         PartitionDispatch pd = node->mt_partition_dispatch_info[i];
 
         heap_close(pd->reldesc, NoLock);
         ExecDropSingleTupleTableSlot(pd->tupslot);
     }
     for (i = 0; i < node->mt_num_partitions; i++)
     {
         ResultRelInfo *resultRelInfo = node->mt_partitions + i;
 
         ExecCloseIndices(resultRelInfo);
         heap_close(resultRelInfo->ri_RelationDesc, NoLock);
     }
 
     /* Release the standalone partition tuple descriptor, if any */
     if (node->mt_partition_tuple_slot)
         ExecDropSingleTupleTableSlot(node->mt_partition_tuple_slot);
 
     /*
      * Free the exprcontext
      */
     ExecFreeExprContext(&node->ps);
 
     /*
      * clean out the tuple table
      */
     ExecClearTuple(node->ps.ps_ResultTupleSlot);
 
     /*
      * Terminate EPQ execution if active
      */
     EvalPlanQualEnd(&node->mt_epqstate);
 
     /*
      * shut down subplans
      */
     for (i = 0; i < node->mt_nplans; i++)
         ExecEndNode(node->mt_plans[i]);
 }

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

Definition at line 1785 of file nodeModifyTable.c.

Referenced by ExecInitNode().

 {
     ModifyTableState *mtstate;
     CmdType     operation = node->operation;
     int         nplans = list_length(node->plans);
     ResultRelInfo *saved_resultRelInfo;
     ResultRelInfo *resultRelInfo;
     TupleDesc   tupDesc;
     Plan       *subplan;
     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->operation = operation;
     mtstate->canSetTag = node->canSetTag;
     mtstate->mt_done = false;
 
     mtstate->mt_plans = (PlanState **) palloc0(sizeof(PlanState *) * nplans);
     mtstate->resultRelInfo = estate->es_result_relations + node->resultRelIndex;
 
     /* If modifying a partitioned table, initialize the root table info */
     if (node->rootResultRelIndex >= 0)
         mtstate->rootResultRelInfo = estate->es_root_result_relations +
             node->rootResultRelIndex;
 
     mtstate->mt_arowmarks = (List **) palloc0(sizeof(List *) * nplans);
     mtstate->mt_nplans = nplans;
     mtstate->mt_onconflict = node->onConflictAction;
     mtstate->mt_arbiterindexes = node->arbiterIndexes;
 
     /* set up epqstate with dummy subplan data for the moment */
     EvalPlanQualInit(&mtstate->mt_epqstate, estate, NULL, NIL, node->epqParam);
     mtstate->fireBSTriggers = true;
 
     /*
      * call ExecInitNode on each of the plans to be executed and save the
      * results into the array "mt_plans".  This is also a convenient place to
      * verify that the proposed target relations are valid and open their
      * indexes for insertion of new index entries.  Note we *must* set
      * estate->es_result_relation_info correctly while we initialize each
      * sub-plan; ExecContextForcesOids depends on that!
      */
     saved_resultRelInfo = estate->es_result_relation_info;
 
     resultRelInfo = mtstate->resultRelInfo;
     i = 0;
     foreach(l, node->plans)
     {
         subplan = (Plan *) lfirst(l);
 
         /* 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->ri_RelationDesc, operation);
 
         /*
          * If there are indices on the result relation, open them and save
          * descriptors in the result relation info, so that we can add new
          * index entries for the tuples we add/update.  We need not do this
          * for a DELETE, however, since deletion doesn't affect indexes. Also,
          * inside an EvalPlanQual operation, the indexes might be open
          * already, since we share the resultrel state with the original
          * query.
          */
         if (resultRelInfo->ri_RelationDesc->rd_rel->relhasindex &&
             operation != CMD_DELETE &&
             resultRelInfo->ri_IndexRelationDescs == NULL)
             ExecOpenIndices(resultRelInfo, mtstate->mt_onconflict != ONCONFLICT_NONE);
 
         /* Now init the plan for this result rel */
         estate->es_result_relation_info = resultRelInfo;
         mtstate->mt_plans[i] = ExecInitNode(subplan, estate, eflags);
 
         /* Also 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);
         }
 
         resultRelInfo++;
         i++;
     }
 
     estate->es_result_relation_info = saved_resultRelInfo;
 
     /* The root table RT index is at the head of the partitioned_rels list */
     if (node->partitioned_rels)
     {
         Index       root_rti;
         Oid         root_oid;
 
         root_rti = linitial_int(node->partitioned_rels);
         root_oid = getrelid(root_rti, estate->es_range_table);
         rel = heap_open(root_oid, NoLock);  /* locked by InitPlan */
     }
     else
         rel = mtstate->resultRelInfo->ri_RelationDesc;
 
     /* Build state for INSERT tuple routing */
     if (operation == CMD_INSERT &&
         rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
     {
         PartitionDispatch *partition_dispatch_info;
         ResultRelInfo *partitions;
         TupleConversionMap **partition_tupconv_maps;
         TupleTableSlot *partition_tuple_slot;
         int         num_parted,
                     num_partitions;
 
         ExecSetupPartitionTupleRouting(rel,
                                        node->nominalRelation,
                                        &partition_dispatch_info,
                                        &partitions,
                                        &partition_tupconv_maps,
                                        &partition_tuple_slot,
                                        &num_parted, &num_partitions);
         mtstate->mt_partition_dispatch_info = partition_dispatch_info;
         mtstate->mt_num_dispatch = num_parted;
         mtstate->mt_partitions = partitions;
         mtstate->mt_num_partitions = num_partitions;
         mtstate->mt_partition_tupconv_maps = partition_tupconv_maps;
         mtstate->mt_partition_tuple_slot = partition_tuple_slot;
     }
 
     /* Build state for collecting transition tuples */
     ExecSetupTransitionCaptureState(mtstate, estate);
 
     /*
      * Initialize any WITH CHECK OPTION constraints if needed.
      */
     resultRelInfo = mtstate->resultRelInfo;
     i = 0;
     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->mt_plans[i]);
 
             wcoExprs = lappend(wcoExprs, wcoExpr);
         }
 
         resultRelInfo->ri_WithCheckOptions = wcoList;
         resultRelInfo->ri_WithCheckOptionExprs = wcoExprs;
         resultRelInfo++;
         i++;
     }
 
     /*
      * Build WITH CHECK OPTION constraints for each leaf partition rel. Note
      * that we didn't build the withCheckOptionList for each partition within
      * the planner, but simple translation of the varattnos for each partition
      * will suffice.  This only occurs for the INSERT case; UPDATE/DELETE
      * cases are handled above.
      */
     if (node->withCheckOptionLists != NIL && mtstate->mt_num_partitions > 0)
     {
         List       *wcoList;
         PlanState  *plan;
 
         /*
          * In case of INSERT on partitioned tables, there is only one plan.
          * Likewise, there is only one WITH CHECK OPTIONS list, not one per
          * partition.  We make a copy of the WCO qual for each partition; note
          * that, if there are SubPlans in there, they all end up attached to
          * the one parent Plan node.
          */
         Assert(operation == CMD_INSERT &&
                list_length(node->withCheckOptionLists) == 1 &&
                mtstate->mt_nplans == 1);
         wcoList = linitial(node->withCheckOptionLists);
         plan = mtstate->mt_plans[0];
         resultRelInfo = mtstate->mt_partitions;
         for (i = 0; i < mtstate->mt_num_partitions; i++)
         {
             Relation    partrel = resultRelInfo->ri_RelationDesc;
             List       *mapped_wcoList;
             List       *wcoExprs = NIL;
             ListCell   *ll;
 
             /* varno = node->nominalRelation */
             mapped_wcoList = map_partition_varattnos(wcoList,
                                                      node->nominalRelation,
                                                      partrel, rel);
             foreach(ll, mapped_wcoList)
             {
                 WithCheckOption *wco = castNode(WithCheckOption, lfirst(ll));
                 ExprState  *wcoExpr = ExecInitQual(castNode(List, wco->qual),
                                                    plan);
 
                 wcoExprs = lappend(wcoExprs, wcoExpr);
             }
 
             resultRelInfo->ri_WithCheckOptions = mapped_wcoList;
             resultRelInfo->ri_WithCheckOptionExprs = wcoExprs;
             resultRelInfo++;
         }
     }
 
     /*
      * Initialize RETURNING projections if needed.
      */
     if (node->returningLists)
     {
         TupleTableSlot *slot;
         ExprContext *econtext;
         List       *returningList;
 
         /*
          * Initialize result tuple slot and assign its rowtype using the first
          * RETURNING list.  We assume the rest will look the same.
          */
         tupDesc = ExecTypeFromTL((List *) linitial(node->returningLists),
                                  false);
 
         /* Set up a slot for the output of the RETURNING projection(s) */
         ExecInitResultTupleSlot(estate, &mtstate->ps);
         ExecAssignResultType(&mtstate->ps, tupDesc);
         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_projectReturning =
                 ExecBuildProjectionInfo(rlist, econtext, slot, &mtstate->ps,
                                         resultRelInfo->ri_RelationDesc->rd_att);
             resultRelInfo++;
         }
 
         /*
          * Build a projection for each leaf partition rel.  Note that we
          * didn't build the returningList for each partition within the
          * planner, but simple translation of the varattnos for each partition
          * will suffice.  This only occurs for the INSERT case; UPDATE/DELETE
          * are handled above.
          */
         resultRelInfo = mtstate->mt_partitions;
         returningList = linitial(node->returningLists);
         for (i = 0; i < mtstate->mt_num_partitions; i++)
         {
             Relation    partrel = resultRelInfo->ri_RelationDesc;
             List       *rlist;
 
             /* varno = node->nominalRelation */
             rlist = map_partition_varattnos(returningList,
                                             node->nominalRelation,
                                             partrel, rel);
             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?).
          */
         tupDesc = ExecTypeFromTL(NIL, false);
         ExecInitResultTupleSlot(estate, &mtstate->ps);
         ExecAssignResultType(&mtstate->ps, tupDesc);
 
         mtstate->ps.ps_ExprContext = NULL;
     }
 
     /* Close the root partitioned rel if we opened it above. */
     if (rel != mtstate->resultRelInfo->ri_RelationDesc)
         heap_close(rel, NoLock);
 
     /*
      * If needed, Initialize target list, projection and qual for ON CONFLICT
      * DO UPDATE.
      */
     resultRelInfo = mtstate->resultRelInfo;
     if (node->onConflictAction == ONCONFLICT_UPDATE)
     {
         ExprContext *econtext;
         TupleDesc   tupDesc;
 
         /* insert may only have one plan, inheritance is not expanded */
         Assert(nplans == 1);
 
         /* already exists if created by RETURNING processing above */
         if (mtstate->ps.ps_ExprContext == NULL)
             ExecAssignExprContext(estate, &mtstate->ps);
 
         econtext = mtstate->ps.ps_ExprContext;
 
         /* initialize slot for the existing tuple */
         mtstate->mt_existing = ExecInitExtraTupleSlot(mtstate->ps.state);
         ExecSetSlotDescriptor(mtstate->mt_existing,
                               resultRelInfo->ri_RelationDesc->rd_att);
 
         /* carried forward solely for the benefit of explain */
         mtstate->mt_excludedtlist = node->exclRelTlist;
 
         /* create target slot for UPDATE SET projection */
         tupDesc = ExecTypeFromTL((List *) node->onConflictSet,
                                  resultRelInfo->ri_RelationDesc->rd_rel->relhasoids);
         mtstate->mt_conflproj = ExecInitExtraTupleSlot(mtstate->ps.state);
         ExecSetSlotDescriptor(mtstate->mt_conflproj, tupDesc);
 
         /* build UPDATE SET projection state */
         resultRelInfo->ri_onConflictSetProj =
             ExecBuildProjectionInfo(node->onConflictSet, econtext,
                                     mtstate->mt_conflproj, &mtstate->ps,
                                     resultRelInfo->ri_RelationDesc->rd_att);
 
         /* build DO UPDATE WHERE clause expression */
         if (node->onConflictWhere)
         {
             ExprState  *qualexpr;
 
             qualexpr = ExecInitQual((List *) node->onConflictWhere,
                                     &mtstate->ps);
 
             resultRelInfo->ri_onConflictSetWhere = 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.
      */
     foreach(l, node->rowMarks)
     {
         PlanRowMark *rc = lfirst_node(PlanRowMark, l);
         ExecRowMark *erm;
 
         /* ignore "parent" rowmarks; they are irrelevant at runtime */
         if (rc->isParent)
             continue;
 
         /* find ExecRowMark (same for all subplans) */
         erm = ExecFindRowMark(estate, rc->rti, false);
 
         /* build ExecAuxRowMark for each subplan */
         for (i = 0; i < nplans; i++)
         {
             ExecAuxRowMark *aerm;
 
             subplan = mtstate->mt_plans[i]->plan;
             aerm = ExecBuildAuxRowMark(erm, subplan->targetlist);
             mtstate->mt_arowmarks[i] = lappend(mtstate->mt_arowmarks[i], aerm);
         }
     }
 
     /* select first subplan */
     mtstate->mt_whichplan = 0;
     subplan = (Plan *) linitial(node->plans);
     EvalPlanQualSetPlan(&mtstate->mt_epqstate, subplan,
                         mtstate->mt_arowmarks[0]);
 
     /*
      * Initialize the junk filter(s) if needed.  INSERT queries need a filter
      * if there are any junk attrs in the tlist.  UPDATE and DELETE always
      * need a filter, since there's always a junk 'ctid' or 'wholerow'
      * attribute present --- no need to look first.
      *
      * If there are multiple result relations, each one needs its own junk
      * filter.  Note multiple rels are only possible for UPDATE/DELETE, so we
      * can't be fooled by some needing a filter and some not.
      *
      * This section of code is also a convenient place to verify that the
      * output of an INSERT or UPDATE matches the target table(s).
      */
     {
         bool        junk_filter_needed = false;
 
         switch (operation)
         {
             case CMD_INSERT:
                 foreach(l, subplan->targetlist)
                 {
                     TargetEntry *tle = (TargetEntry *) lfirst(l);
 
                     if (tle->resjunk)
                     {
                         junk_filter_needed = true;
                         break;
                     }
                 }
                 break;
             case CMD_UPDATE:
             case CMD_DELETE:
                 junk_filter_needed = true;
                 break;
             default:
                 elog(ERROR, "unknown operation");
                 break;
         }
 
         if (junk_filter_needed)
         {
             resultRelInfo = mtstate->resultRelInfo;
             for (i = 0; i < nplans; i++)
             {
                 JunkFilter *j;
 
                 subplan = mtstate->mt_plans[i]->plan;
                 if (operation == CMD_INSERT || operation == CMD_UPDATE)
                     ExecCheckPlanOutput(resultRelInfo->ri_RelationDesc,
                                         subplan->targetlist);
 
                 j = ExecInitJunkFilter(subplan->targetlist,
                                        resultRelInfo->ri_RelationDesc->rd_att->tdhasoid,
                                        ExecInitExtraTupleSlot(estate));
 
                 if (operation == CMD_UPDATE || operation == CMD_DELETE)
                 {
                     /* For UPDATE/DELETE, find the appropriate junk attr now */
                     char        relkind;
 
                     relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
                     if (relkind == RELKIND_RELATION ||
                         relkind == RELKIND_MATVIEW ||
                         relkind == RELKIND_PARTITIONED_TABLE)
                     {
                         j->jf_junkAttNo = ExecFindJunkAttribute(j, "ctid");
                         if (!AttributeNumberIsValid(j->jf_junkAttNo))
                             elog(ERROR, "could not find junk ctid column");
                     }
                     else if (relkind == RELKIND_FOREIGN_TABLE)
                     {
                         /*
                          * When there is an AFTER trigger, there should be a
                          * wholerow attribute.
                          */
                         j->jf_junkAttNo = ExecFindJunkAttribute(j, "wholerow");
                     }
                     else
                     {
                         j->jf_junkAttNo = ExecFindJunkAttribute(j, "wholerow");
                         if (!AttributeNumberIsValid(j->jf_junkAttNo))
                             elog(ERROR, "could not find junk wholerow column");
                     }
                 }
 
                 resultRelInfo->ri_junkFilter = j;
                 resultRelInfo++;
             }
         }
         else
         {
             if (operation == CMD_INSERT)
                 ExecCheckPlanOutput(mtstate->resultRelInfo->ri_RelationDesc,
                                     subplan->targetlist);
         }
     }
 
     /*
      * Set up a tuple table slot for use for trigger output tuples. In a plan
      * containing multiple ModifyTable nodes, all can share one such slot, so
      * we keep it in the estate.
      */
     if (estate->es_trig_tuple_slot == NULL)
         estate->es_trig_tuple_slot = ExecInitExtraTupleSlot(estate);
 
     /*
      * 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;
 }

static TupleTableSlot* ExecInsert	(	ModifyTableState *	mtstate,
		TupleTableSlot *	slot,
		TupleTableSlot *	planSlot,
		List *	arbiterIndexes,
		OnConflictAction	onconflict,
		EState *	estate,
		bool	canSetTag
	)

static

Definition at line 252 of file nodeModifyTable.c.

References Assert, tupleDesc::constr, do_convert_tuple(), ereport, errcode(), errmsg(), ERROR, EState::es_lastoid, EState::es_output_cid, EState::es_processed, EState::es_result_relation_info, ExecARInsertTriggers(), ExecBRInsertTriggers(), ExecCheckIndexConstraints(), ExecCheckTIDVisible(), ExecConstraints(), ExecFindPartition(), FdwRoutine::ExecForeignInsert, ExecInsertIndexTuples(), ExecIRInsertTriggers(), ExecMaterializeSlot(), ExecOnConflictUpdate(), ExecProcessReturning(), ExecSetSlotDescriptor(), ExecStoreTuple(), ExecWithCheckOptions(), GetCurrentTransactionId(), heap_abort_speculative(), heap_finish_speculative(), heap_insert(), HEAP_INSERT_SPECULATIVE, HeapTupleHeaderSetSpeculativeToken, HeapTupleSetOid, InstrCountFiltered2, InvalidBuffer, InvalidOid, list_free(), ModifyTableState::mt_partition_dispatch_info, ModifyTableState::mt_partition_tupconv_maps, ModifyTableState::mt_partition_tuple_slot, ModifyTableState::mt_partitions, ModifyTableState::mt_transition_capture, ModifyTableState::mt_transition_tupconv_maps, NIL, NULL, ONCONFLICT_NONE, ONCONFLICT_NOTHING, ONCONFLICT_UPDATE, ModifyTableState::ps, RelationData::rd_att, RelationData::rd_rel, RelationGetDescr, RelationGetRelid, result, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_NumIndices, ResultRelInfo::ri_PartitionCheck, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, ResultRelInfo::ri_WithCheckOptions, setLastTid(), SpeculativeInsertionLockAcquire(), SpeculativeInsertionLockRelease(), HeapTupleData::t_data, HeapTupleData::t_self, HeapTupleData::t_tableOid, TransitionCaptureState::tcs_map, TransitionCaptureState::tcs_original_insert_tuple, TriggerDesc::trig_insert_before_row, TriggerDesc::trig_insert_instead_row, WCO_RLS_INSERT_CHECK, and WCO_VIEW_CHECK.

Referenced by ExecModifyTable().

 {
     HeapTuple   tuple;
     ResultRelInfo *resultRelInfo;
     ResultRelInfo *saved_resultRelInfo = NULL;
     Relation    resultRelationDesc;
     Oid         newId;
     List       *recheckIndexes = NIL;
     TupleTableSlot *result = NULL;
 
     /*
      * get the heap tuple out of the tuple table slot, making sure we have a
      * writable copy
      */
     tuple = ExecMaterializeSlot(slot);
 
     /*
      * get information on the (current) result relation
      */
     resultRelInfo = estate->es_result_relation_info;
 
     /* Determine the partition to heap_insert the tuple into */
     if (mtstate->mt_partition_dispatch_info)
     {
         int         leaf_part_index;
         TupleConversionMap *map;
 
         /*
          * Away we go ... If we end up not finding a partition after all,
          * ExecFindPartition() does not return and errors out instead.
          * Otherwise, the returned value is to be used as an index into arrays
          * mt_partitions[] and mt_partition_tupconv_maps[] that will get us
          * the ResultRelInfo and TupleConversionMap for the partition,
          * respectively.
          */
         leaf_part_index = ExecFindPartition(resultRelInfo,
                                             mtstate->mt_partition_dispatch_info,
                                             slot,
                                             estate);
         Assert(leaf_part_index >= 0 &&
                leaf_part_index < mtstate->mt_num_partitions);
 
         /*
          * Save the old ResultRelInfo and switch to the one corresponding to
          * the selected partition.
          */
         saved_resultRelInfo = resultRelInfo;
         resultRelInfo = mtstate->mt_partitions + leaf_part_index;
 
         /* We do not yet have a way to insert into a foreign partition */
         if (resultRelInfo->ri_FdwRoutine)
             ereport(ERROR,
                     (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                      errmsg("cannot route inserted tuples to a foreign table")));
 
         /* For ExecInsertIndexTuples() to work on the partition's indexes */
         estate->es_result_relation_info = resultRelInfo;
 
         /*
          * If we're capturing transition tuples, we might need to convert from
          * the partition rowtype to parent rowtype.
          */
         if (mtstate->mt_transition_capture != NULL)
         {
             if (resultRelInfo->ri_TrigDesc &&
                 (resultRelInfo->ri_TrigDesc->trig_insert_before_row ||
                  resultRelInfo->ri_TrigDesc->trig_insert_instead_row))
             {
                 /*
                  * If there are any BEFORE or INSTEAD triggers on the
                  * partition, we'll have to be ready to convert their result
                  * back to tuplestore format.
                  */
                 mtstate->mt_transition_capture->tcs_original_insert_tuple = NULL;
                 mtstate->mt_transition_capture->tcs_map =
                     mtstate->mt_transition_tupconv_maps[leaf_part_index];
             }
             else
             {
                 /*
                  * Otherwise, just remember the original unconverted tuple, to
                  * avoid a needless round trip conversion.
                  */
                 mtstate->mt_transition_capture->tcs_original_insert_tuple = tuple;
                 mtstate->mt_transition_capture->tcs_map = NULL;
             }
         }
 
         /*
          * We might need to convert from the parent rowtype to the partition
          * rowtype.
          */
         map = mtstate->mt_partition_tupconv_maps[leaf_part_index];
         if (map)
         {
             Relation    partrel = resultRelInfo->ri_RelationDesc;
 
             tuple = do_convert_tuple(tuple, map);
 
             /*
              * We must use the partition's tuple descriptor from this point
              * on, until we're finished dealing with the partition. Use the
              * dedicated slot for that.
              */
             slot = mtstate->mt_partition_tuple_slot;
             Assert(slot != NULL);
             ExecSetSlotDescriptor(slot, RelationGetDescr(partrel));
             ExecStoreTuple(tuple, slot, InvalidBuffer, true);
         }
     }
 
     resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
     /*
      * If the result relation has OIDs, force the tuple's OID to zero so that
      * heap_insert will assign a fresh OID.  Usually the OID already will be
      * zero at this point, but there are corner cases where the plan tree can
      * return a tuple extracted literally from some table with the same
      * rowtype.
      *
      * XXX if we ever wanted to allow users to assign their own OIDs to new
      * rows, this'd be the place to do it.  For the moment, we make a point of
      * doing this before calling triggers, so that a user-supplied trigger
      * could hack the OID if desired.
      */
     if (resultRelationDesc->rd_rel->relhasoids)
         HeapTupleSetOid(tuple, InvalidOid);
 
     /*
      * 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)
     {
         slot = ExecBRInsertTriggers(estate, resultRelInfo, slot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /* trigger might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
     }
 
     /* INSTEAD OF ROW INSERT Triggers */
     if (resultRelInfo->ri_TrigDesc &&
         resultRelInfo->ri_TrigDesc->trig_insert_instead_row)
     {
         slot = ExecIRInsertTriggers(estate, resultRelInfo, slot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /* trigger might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
 
         newId = InvalidOid;
     }
     else if (resultRelInfo->ri_FdwRoutine)
     {
         /*
          * 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;
 
         /* FDW might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
 
         /*
          * AFTER ROW Triggers or RETURNING expressions might reference the
          * tableoid column, so initialize t_tableOid before evaluating them.
          */
         tuple->t_tableOid = RelationGetRelid(resultRelationDesc);
 
         newId = InvalidOid;
     }
     else
     {
         /*
          * We always check the partition constraint, including when the tuple
          * got here via tuple-routing.  However we don't need to in the latter
          * case if no BR trigger is defined on the partition.  Note that a BR
          * trigger might modify the tuple such that the partition constraint
          * is no longer satisfied, so we need to check in that case.
          */
         bool        check_partition_constr =
         (resultRelInfo->ri_PartitionCheck != NIL);
 
         /*
          * Constraints might reference the tableoid column, so initialize
          * t_tableOid before evaluating them.
          */
         tuple->t_tableOid = RelationGetRelid(resultRelationDesc);
 
         /*
          * Check any RLS INSERT WITH CHECK policies
          *
          * 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_RLS_INSERT_CHECK,
                                  resultRelInfo, slot, estate);
 
         /*
          * No need though if the tuple has been routed, and a BR trigger
          * doesn't exist.
          */
         if (saved_resultRelInfo != NULL &&
             !(resultRelInfo->ri_TrigDesc &&
               resultRelInfo->ri_TrigDesc->trig_insert_before_row))
             check_partition_constr = false;
 
         /* Check the constraints of the tuple */
         if (resultRelationDesc->rd_att->constr || check_partition_constr)
             ExecConstraints(resultRelInfo, slot, estate);
 
         if (onconflict != ONCONFLICT_NONE && resultRelInfo->ri_NumIndices > 0)
         {
             /* Perform a speculative insertion. */
             uint32      specToken;
             ItemPointerData conflictTid;
             bool        specConflict;
 
             /*
              * 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.
              */
     vlock:
             specConflict = false;
             if (!ExecCheckIndexConstraints(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(mtstate, resultRelInfo,
                                              &conflictTid, planSlot, slot,
                                              estate, canSetTag, &returning))
                     {
                         InstrCountFiltered2(&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.
                      */
                     Assert(onconflict == ONCONFLICT_NOTHING);
                     ExecCheckTIDVisible(estate, resultRelInfo, &conflictTid);
                     InstrCountFiltered2(&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());
             HeapTupleHeaderSetSpeculativeToken(tuple->t_data, specToken);
 
             /* insert the tuple, with the speculative token */
             newId = heap_insert(resultRelationDesc, tuple,
                                 estate->es_output_cid,
                                 HEAP_INSERT_SPECULATIVE,
                                 NULL);
 
             /* insert index entries for tuple */
             recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
                                                    estate, true, &specConflict,
                                                    arbiterIndexes);
 
             /* adjust the tuple's state accordingly */
             if (!specConflict)
                 heap_finish_speculative(resultRelationDesc, tuple);
             else
                 heap_abort_speculative(resultRelationDesc, tuple);
 
             /*
              * 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.
              *
              * Note: heap_insert returns the tid (location) of the new tuple
              * in the t_self field.
              */
             newId = heap_insert(resultRelationDesc, tuple,
                                 estate->es_output_cid,
                                 0, NULL);
 
             /* insert index entries for tuple */
             if (resultRelInfo->ri_NumIndices > 0)
                 recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
                                                        estate, false, NULL,
                                                        arbiterIndexes);
         }
     }
 
     if (canSetTag)
     {
         (estate->es_processed)++;
         estate->es_lastoid = newId;
         setLastTid(&(tuple->t_self));
     }
 
     /* AFTER ROW INSERT Triggers */
     ExecARInsertTriggers(estate, resultRelInfo, tuple, recheckIndexes,
                          mtstate->mt_transition_capture);
 
     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 (saved_resultRelInfo)
         estate->es_result_relation_info = saved_resultRelInfo;
 
     return result;
 }

TupleTableSlot* ExecModifyTable ( ModifyTableState * node )

Definition at line 1539 of file nodeModifyTable.c.

Referenced by ExecProcNode().

 {
     EState     *estate = node->ps.state;
     CmdType     operation = node->operation;
     ResultRelInfo *saved_resultRelInfo;
     ResultRelInfo *resultRelInfo;
     PlanState  *subplanstate;
     JunkFilter *junkfilter;
     TupleTableSlot *slot;
     TupleTableSlot *planSlot;
     ItemPointer tupleid = NULL;
     ItemPointerData tuple_ctid;
     HeapTupleData oldtupdata;
     HeapTuple   oldtuple;
 
     /*
      * 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_epqTuple != 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_whichplan;
     subplanstate = node->mt_plans[node->mt_whichplan];
     junkfilter = resultRelInfo->ri_junkFilter;
 
     /*
      * es_result_relation_info must point to the currently active result
      * relation while we are within this ModifyTable node.  Even though
      * ModifyTable nodes can't be nested statically, they can be nested
      * dynamically (since our subplan could include a reference to a modifying
      * CTE).  So we have to save and restore the caller's value.
      */
     saved_resultRelInfo = estate->es_result_relation_info;
 
     estate->es_result_relation_info = resultRelInfo;
 
     /*
      * Fetch rows from subplan(s), 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);
 
         planSlot = ExecProcNode(subplanstate);
 
         if (TupIsNull(planSlot))
         {
             /* advance to next subplan if any */
             node->mt_whichplan++;
             if (node->mt_whichplan < node->mt_nplans)
             {
                 resultRelInfo++;
                 subplanstate = node->mt_plans[node->mt_whichplan];
                 junkfilter = resultRelInfo->ri_junkFilter;
                 estate->es_result_relation_info = resultRelInfo;
                 EvalPlanQualSetPlan(&node->mt_epqstate, subplanstate->plan,
                                     node->mt_arowmarks[node->mt_whichplan]);
                 if (node->mt_transition_capture != NULL)
                 {
                     /* Prepare to convert transition tuples from this child. */
                     Assert(node->mt_transition_tupconv_maps != NULL);
                     node->mt_transition_capture->tcs_map =
                         node->mt_transition_tupconv_maps[node->mt_whichplan];
                 }
                 continue;
             }
             else
                 break;
         }
 
         /*
          * 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, planSlot);
 
             estate->es_result_relation_info = saved_resultRelInfo;
             return slot;
         }
 
         EvalPlanQualSetSlot(&node->mt_epqstate, planSlot);
         slot = planSlot;
 
         oldtuple = NULL;
         if (junkfilter != NULL)
         {
             /*
              * extract the 'ctid' or 'wholerow' junk attribute.
              */
             if (operation == CMD_UPDATE || operation == CMD_DELETE)
             {
                 char        relkind;
                 Datum       datum;
                 bool        isNull;
 
                 relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
                 if (relkind == RELKIND_RELATION || relkind == RELKIND_MATVIEW)
                 {
                     datum = ExecGetJunkAttribute(slot,
                                                  junkfilter->jf_junkAttNo,
                                                  &isNull);
                     /* shouldn't ever get a null result... */
                     if (isNull)
                         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.
                  *
                  * Foreign table updates have a wholerow attribute when the
                  * relation has an AFTER ROW trigger.  Note that the wholerow
                  * attribute does not carry system columns.  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(junkfilter->jf_junkAttNo))
                 {
                     datum = ExecGetJunkAttribute(slot,
                                                  junkfilter->jf_junkAttNo,
                                                  &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
                     Assert(relkind == RELKIND_FOREIGN_TABLE);
             }
 
             /*
              * apply the junkfilter if needed.
              */
             if (operation != CMD_DELETE)
                 slot = ExecFilterJunk(junkfilter, slot);
         }
 
         switch (operation)
         {
             case CMD_INSERT:
                 slot = ExecInsert(node, slot, planSlot,
                                   node->mt_arbiterindexes, node->mt_onconflict,
                                   estate, node->canSetTag);
                 break;
             case CMD_UPDATE:
                 slot = ExecUpdate(node, tupleid, oldtuple, slot, planSlot,
                                   &node->mt_epqstate, estate, node->canSetTag);
                 break;
             case CMD_DELETE:
                 slot = ExecDelete(node, tupleid, oldtuple, planSlot,
                                   &node->mt_epqstate, estate, 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)
         {
             estate->es_result_relation_info = saved_resultRelInfo;
             return slot;
         }
     }
 
     /* Restore es_result_relation_info before exiting */
     estate->es_result_relation_info = saved_resultRelInfo;
 
     /*
      * We're done, but fire AFTER STATEMENT triggers before exiting.
      */
     fireASTriggers(node);
 
     node->mt_done = true;
 
     return NULL;
 }

static bool ExecOnConflictUpdate	(	ModifyTableState *	mtstate,
		ResultRelInfo *	resultRelInfo,
		ItemPointer	conflictTid,
		TupleTableSlot *	planSlot,
		TupleTableSlot *	excludedSlot,
		EState *	estate,
		bool	canSetTag,
		TupleTableSlot **	returning
	)

static

Definition at line 1195 of file nodeModifyTable.c.

References buffer, ExprContext::ecxt_innertuple, ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, elog, ereport, errcode(), errhint(), errmsg(), ERROR, EState::es_output_cid, ExecCheckHeapTupleVisible(), ExecProject(), ExecQual(), ExecStoreTuple(), ExecUpdate(), ExecUpdateLockMode(), ExecWithCheckOptions(), heap_lock_tuple(), HeapTupleHeaderGetXmin, HeapTupleInvisible, HeapTupleMayBeUpdated, HeapTupleSelfUpdated, HeapTupleUpdated, InstrCountFiltered1, IsolationUsesXactSnapshot, LockWaitBlock, ModifyTableState::mt_conflproj, ModifyTableState::mt_epqstate, ModifyTableState::mt_existing, NIL, NULL, ModifyTableState::ps, PlanState::ps_ExprContext, ReleaseBuffer(), ResetExprContext, ResultRelInfo::ri_onConflictSetProj, ResultRelInfo::ri_onConflictSetWhere, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_WithCheckOptions, PlanState::state, HeapTupleData::t_data, HeapTupleData::t_self, test(), TransactionIdIsCurrentTransactionId(), and WCO_RLS_CONFLICT_CHECK.

Referenced by ExecInsert().

 {
     ExprContext *econtext = mtstate->ps.ps_ExprContext;
     Relation    relation = resultRelInfo->ri_RelationDesc;
     ExprState  *onConflictSetWhere = resultRelInfo->ri_onConflictSetWhere;
     HeapTupleData tuple;
     HeapUpdateFailureData hufd;
     LockTupleMode lockmode;
     HTSU_Result test;
     Buffer      buffer;
 
     /* Determine lock mode to use */
     lockmode = ExecUpdateLockMode(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.
      */
     tuple.t_self = *conflictTid;
     test = heap_lock_tuple(relation, &tuple, estate->es_output_cid,
                            lockmode, LockWaitBlock, false, &buffer,
                            &hufd);
     switch (test)
     {
         case HeapTupleMayBeUpdated:
             /* success! */
             break;
 
         case HeapTupleInvisible:
 
             /*
              * 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()
              * HeapTupleSelfUpdated 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 SQL-2003 similarly specifies
              * that for SQL MERGE, an exception must be raised in the event of
              * an attempt to update the same row twice.
              */
             if (TransactionIdIsCurrentTransactionId(HeapTupleHeaderGetXmin(tuple.t_data)))
                 ereport(ERROR,
                         (errcode(ERRCODE_CARDINALITY_VIOLATION),
                          errmsg("ON CONFLICT DO UPDATE command cannot affect row a second time"),
                          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");
 
         case HeapTupleSelfUpdated:
 
             /*
              * 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");
 
         case HeapTupleUpdated:
             if (IsolationUsesXactSnapshot())
                 ereport(ERROR,
                         (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                          errmsg("could not serialize access due to concurrent update")));
 
             /*
              * 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.
              */
             ReleaseBuffer(buffer);
             return false;
 
         default:
             elog(ERROR, "unrecognized heap_lock_tuple status: %u", test);
     }
 
     /*
      * Success, the tuple is locked.
      *
      * Reset per-tuple memory context to free any expression evaluation
      * storage allocated in the previous cycle.
      */
     ResetExprContext(econtext);
 
     /*
      * 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.
      */
     ExecCheckHeapTupleVisible(estate, &tuple, buffer);
 
     /* Store target's existing tuple in the state's dedicated slot */
     ExecStoreTuple(&tuple, mtstate->mt_existing, buffer, false);
 
     /*
      * 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 = mtstate->mt_existing;
     econtext->ecxt_innertuple = excludedSlot;
     econtext->ecxt_outertuple = NULL;
 
     if (!ExecQual(onConflictSetWhere, econtext))
     {
         ReleaseBuffer(buffer);
         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,
                              mtstate->mt_existing,
                              mtstate->ps.state);
     }
 
     /* Project the new tuple version */
     ExecProject(resultRelInfo->ri_onConflictSetProj);
 
     /*
      * Note that it is possible that the target tuple has been modified in
      * this session, after the above heap_lock_tuple. 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(mtstate, &tuple.t_self, NULL,
                             mtstate->mt_conflproj, planSlot,
                             &mtstate->mt_epqstate, mtstate->ps.state,
                             canSetTag);
 
     ReleaseBuffer(buffer);
     return true;
 }

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

static

Definition at line 148 of file nodeModifyTable.c.

References Assert, ExprContext::ecxt_outertuple, ExprContext::ecxt_scantuple, ExecMaterializeSlot(), ExecProject(), ProjectionInfo::pi_exprContext, RelationGetRelid, ResetExprContext, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RelationDesc, HeapTupleData::t_tableOid, and TupIsNull.

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

 {
     ProjectionInfo *projectReturning = resultRelInfo->ri_projectReturning;
     ExprContext *econtext = projectReturning->pi_exprContext;
 
     /*
      * Reset per-tuple memory context to free any expression evaluation
      * storage allocated in the previous cycle.
      */
     ResetExprContext(econtext);
 
     /* Make tuple and any needed join variables available to ExecProject */
     if (tupleSlot)
         econtext->ecxt_scantuple = tupleSlot;
     else
     {
         HeapTuple   tuple;
 
         /*
          * RETURNING expressions might reference the tableoid column, so
          * initialize t_tableOid before evaluating them.
          */
         Assert(!TupIsNull(econtext->ecxt_scantuple));
         tuple = ExecMaterializeSlot(econtext->ecxt_scantuple);
         tuple->t_tableOid = RelationGetRelid(resultRelInfo->ri_RelationDesc);
     }
     econtext->ecxt_outertuple = planSlot;
 
     /* Compute the RETURNING expressions */
     return ExecProject(projectReturning);
 }

void ExecReScanModifyTable ( ModifyTableState * node )

Definition at line 2380 of file nodeModifyTable.c.

References elog, and ERROR.

Referenced by ExecReScan().

 {
     /*
      * 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");
 }

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

static

Definition at line 1469 of file nodeModifyTable.c.

References convert_tuples_by_name(), getASTriggerResultRelInfo(), gettext_noop, i, MakeTransitionCaptureState(), ModifyTableState::mt_nplans, ModifyTableState::mt_num_partitions, ModifyTableState::mt_partition_dispatch_info, ModifyTableState::mt_partitions, ModifyTableState::mt_transition_capture, ModifyTableState::mt_transition_tupconv_maps, NULL, palloc0(), RelationGetDescr, ModifyTableState::resultRelInfo, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, and TransitionCaptureState::tcs_map.

Referenced by ExecInitModifyTable().

 {
     ResultRelInfo *targetRelInfo = getASTriggerResultRelInfo(mtstate);
     int     i;
 
     /* Check for transition tables on the directly targeted relation. */
     mtstate->mt_transition_capture =
         MakeTransitionCaptureState(targetRelInfo->ri_TrigDesc);
 
     /*
      * If we found that we need to collect transition tuples then we may also
      * need tuple conversion maps for any children that have TupleDescs that
      * aren't compatible with the tuplestores.
      */
     if (mtstate->mt_transition_capture != NULL)
     {
         ResultRelInfo *resultRelInfos;
         int     numResultRelInfos;
 
         /* Find the set of partitions so that we can find their TupleDescs. */
         if (mtstate->mt_partition_dispatch_info != NULL)
         {
             /*
              * For INSERT via partitioned table, so we need TupleDescs based
              * on the partition routing table.
              */
             resultRelInfos = mtstate->mt_partitions;
             numResultRelInfos = mtstate->mt_num_partitions;
         }
         else
         {
             /* Otherwise we need the ResultRelInfo for each subplan. */
             resultRelInfos = mtstate->resultRelInfo;
             numResultRelInfos = mtstate->mt_nplans;
         }
 
         /*
          * Build array of conversion maps from each child's TupleDesc to the
          * one used in the tuplestore.  The map pointers may be NULL when no
          * conversion is necessary, which is hopefully a common case for
          * partitions.
          */
         mtstate->mt_transition_tupconv_maps = (TupleConversionMap **)
             palloc0(sizeof(TupleConversionMap *) * numResultRelInfos);
         for (i = 0; i < numResultRelInfos; ++i)
         {
             mtstate->mt_transition_tupconv_maps[i] =
                 convert_tuples_by_name(RelationGetDescr(resultRelInfos[i].ri_RelationDesc),
                                        RelationGetDescr(targetRelInfo->ri_RelationDesc),
                                        gettext_noop("could not convert row type"));
         }
 
         /*
          * Install the conversion map for the first plan for UPDATE and DELETE
          * operations.  It will be advanced each time we switch to the next
          * plan.  (INSERT operations set it every time.)
          */
         mtstate->mt_transition_capture->tcs_map =
             mtstate->mt_transition_tupconv_maps[0];
     }
 }

static TupleTableSlot* ExecUpdate	(	ModifyTableState *	mtstate,
		ItemPointer	tupleid,
		HeapTuple	oldtuple,
		TupleTableSlot *	slot,
		TupleTableSlot *	planSlot,
		EPQState *	epqstate,
		EState *	estate,
		bool	canSetTag
	)

static

Definition at line 930 of file nodeModifyTable.c.

References HeapUpdateFailureData::cmax, tupleDesc::constr, HeapUpdateFailureData::ctid, elog, ereport, errcode(), errhint(), errmsg(), ERROR, EState::es_crosscheck_snapshot, EState::es_output_cid, EState::es_processed, EState::es_result_relation_info, EvalPlanQual(), ExecARUpdateTriggers(), ExecBRUpdateTriggers(), ExecConstraints(), ExecFilterJunk(), FdwRoutine::ExecForeignUpdate, ExecInsertIndexTuples(), ExecIRUpdateTriggers(), ExecMaterializeSlot(), ExecProcessReturning(), ExecWithCheckOptions(), heap_update(), HeapTupleIsHeapOnly, HeapTupleMayBeUpdated, HeapTupleSelfUpdated, HeapTupleUpdated, IsBootstrapProcessingMode, IsolationUsesXactSnapshot, ItemPointerEquals(), list_free(), ModifyTableState::mt_transition_capture, NIL, NULL, RelationData::rd_att, RelationGetRelid, result, ResultRelInfo::ri_FdwRoutine, ResultRelInfo::ri_junkFilter, ResultRelInfo::ri_NumIndices, ResultRelInfo::ri_PartitionCheck, ResultRelInfo::ri_projectReturning, ResultRelInfo::ri_RangeTableIndex, ResultRelInfo::ri_RelationDesc, ResultRelInfo::ri_TrigDesc, ResultRelInfo::ri_WithCheckOptions, HeapTupleData::t_self, HeapTupleData::t_tableOid, TriggerDesc::trig_update_before_row, TriggerDesc::trig_update_instead_row, TupIsNull, WCO_RLS_UPDATE_CHECK, WCO_VIEW_CHECK, and HeapUpdateFailureData::xmax.

Referenced by ExecModifyTable(), and ExecOnConflictUpdate().

 {
     HeapTuple   tuple;
     ResultRelInfo *resultRelInfo;
     Relation    resultRelationDesc;
     HTSU_Result result;
     HeapUpdateFailureData hufd;
     List       *recheckIndexes = NIL;
 
     /*
      * abort the operation if not running transactions
      */
     if (IsBootstrapProcessingMode())
         elog(ERROR, "cannot UPDATE during bootstrap");
 
     /*
      * get the heap tuple out of the tuple table slot, making sure we have a
      * writable copy
      */
     tuple = ExecMaterializeSlot(slot);
 
     /*
      * get information on the (current) result relation
      */
     resultRelInfo = estate->es_result_relation_info;
     resultRelationDesc = resultRelInfo->ri_RelationDesc;
 
     /* BEFORE ROW UPDATE Triggers */
     if (resultRelInfo->ri_TrigDesc &&
         resultRelInfo->ri_TrigDesc->trig_update_before_row)
     {
         slot = ExecBRUpdateTriggers(estate, epqstate, resultRelInfo,
                                     tupleid, oldtuple, slot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /* trigger might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
     }
 
     /* INSTEAD OF ROW UPDATE Triggers */
     if (resultRelInfo->ri_TrigDesc &&
         resultRelInfo->ri_TrigDesc->trig_update_instead_row)
     {
         slot = ExecIRUpdateTriggers(estate, resultRelInfo,
                                     oldtuple, slot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /* trigger might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
     }
     else if (resultRelInfo->ri_FdwRoutine)
     {
         /*
          * update in foreign table: let the FDW do it
          */
         slot = resultRelInfo->ri_FdwRoutine->ExecForeignUpdate(estate,
                                                                resultRelInfo,
                                                                slot,
                                                                planSlot);
 
         if (slot == NULL)       /* "do nothing" */
             return NULL;
 
         /* FDW might have changed tuple */
         tuple = ExecMaterializeSlot(slot);
 
         /*
          * AFTER ROW Triggers or RETURNING expressions might reference the
          * tableoid column, so initialize t_tableOid before evaluating them.
          */
         tuple->t_tableOid = RelationGetRelid(resultRelationDesc);
     }
     else
     {
         LockTupleMode lockmode;
 
         /*
          * Constraints might reference the tableoid column, so initialize
          * t_tableOid before evaluating them.
          */
         tuple->t_tableOid = RelationGetRelid(resultRelationDesc);
 
         /*
          * Check any RLS UPDATE WITH CHECK policies
          *
          * 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 heap_lock_tuple to lock the
          * correct tuple, so there's no need to do them again.)
          *
          * ExecWithCheckOptions() will skip any WCOs which are not of the kind
          * we are looking for at this point.
          */
 lreplace:;
         if (resultRelInfo->ri_WithCheckOptions != NIL)
             ExecWithCheckOptions(WCO_RLS_UPDATE_CHECK,
                                  resultRelInfo, slot, estate);
 
         /*
          * Check the constraints of the tuple.  Note that we pass the same
          * slot for the orig_slot argument, because unlike ExecInsert(), no
          * tuple-routing is performed here, hence the slot remains unchanged.
          */
         if (resultRelationDesc->rd_att->constr || resultRelInfo->ri_PartitionCheck)
             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 = heap_update(resultRelationDesc, tupleid, tuple,
                              estate->es_output_cid,
                              estate->es_crosscheck_snapshot,
                              true /* wait for commit */ ,
                              &hufd, &lockmode);
         switch (result)
         {
             case HeapTupleSelfUpdated:
 
                 /*
                  * 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 (hufd.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 HeapTupleMayBeUpdated:
                 break;
 
             case HeapTupleUpdated:
                 if (IsolationUsesXactSnapshot())
                     ereport(ERROR,
                             (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
                              errmsg("could not serialize access due to concurrent update")));
                 if (!ItemPointerEquals(tupleid, &hufd.ctid))
                 {
                     TupleTableSlot *epqslot;
 
                     epqslot = EvalPlanQual(estate,
                                            epqstate,
                                            resultRelationDesc,
                                            resultRelInfo->ri_RangeTableIndex,
                                            lockmode,
                                            &hufd.ctid,
                                            hufd.xmax);
                     if (!TupIsNull(epqslot))
                     {
                         *tupleid = hufd.ctid;
                         slot = ExecFilterJunk(resultRelInfo->ri_junkFilter, epqslot);
                         tuple = ExecMaterializeSlot(slot);
                         goto lreplace;
                     }
                 }
                 /* tuple already deleted; nothing to do */
                 return NULL;
 
             default:
                 elog(ERROR, "unrecognized heap_update status: %u", result);
                 return NULL;
         }
 
         /*
          * Note: instead of having to update the old index tuples associated
          * with the heap tuple, all we do is form and insert new index tuples.
          * This is because UPDATEs are actually DELETEs and INSERTs, and index
          * tuple deletion is done later by VACUUM (see notes in ExecDelete).
          * All we do here is insert new index tuples.  -cim 9/27/89
          */
 
         /*
          * insert index entries for tuple
          *
          * Note: heap_update returns the tid (location) of the new tuple in
          * the t_self field.
          *
          * If it's a HOT update, we mustn't insert new index entries.
          */
         if (resultRelInfo->ri_NumIndices > 0 && !HeapTupleIsHeapOnly(tuple))
             recheckIndexes = ExecInsertIndexTuples(slot, &(tuple->t_self),
                                                    estate, false, NULL, NIL);
     }
 
     if (canSetTag)
         (estate->es_processed)++;
 
     /* AFTER ROW UPDATE Triggers */
     ExecARUpdateTriggers(estate, resultRelInfo, tupleid, oldtuple, tuple,
                          recheckIndexes,
                          mtstate->mt_transition_capture);
 
     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 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, estate);
 
     /* Process RETURNING if present */
     if (resultRelInfo->ri_projectReturning)
         return ExecProcessReturning(resultRelInfo, slot, planSlot);
 
     return NULL;
 }

static void fireASTriggers ( ModifyTableState * node )

static

Definition at line 1436 of file nodeModifyTable.c.

References CMD_DELETE, CMD_INSERT, CMD_UPDATE, elog, ERROR, ExecASDeleteTriggers(), ExecASInsertTriggers(), ExecASUpdateTriggers(), getASTriggerResultRelInfo(), ModifyTableState::mt_onconflict, ModifyTableState::mt_transition_capture, ONCONFLICT_UPDATE, ModifyTableState::operation, ModifyTableState::ps, and PlanState::state.

Referenced by ExecModifyTable().

 {
     ResultRelInfo *resultRelInfo = getASTriggerResultRelInfo(node);
 
     switch (node->operation)
     {
         case CMD_INSERT:
             if (node->mt_onconflict == ONCONFLICT_UPDATE)
                 ExecASUpdateTriggers(node->ps.state,
                                      resultRelInfo,
                                      node->mt_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;
         default:
             elog(ERROR, "unknown operation");
             break;
     }
 }

static void fireBSTriggers ( ModifyTableState * node )

static

Definition at line 1381 of file nodeModifyTable.c.

References CMD_DELETE, CMD_INSERT, CMD_UPDATE, elog, ERROR, ExecBSDeleteTriggers(), ExecBSInsertTriggers(), ExecBSUpdateTriggers(), ModifyTableState::mt_onconflict, NULL, ONCONFLICT_UPDATE, ModifyTableState::operation, ModifyTableState::ps, ModifyTableState::resultRelInfo, ModifyTableState::rootResultRelInfo, and PlanState::state.

Referenced by ExecModifyTable().

 {
     ResultRelInfo *resultRelInfo = node->resultRelInfo;
 
     /*
      * If the node modifies a partitioned table, we must fire its triggers.
      * Note that in that case, node->resultRelInfo points to the first leaf
      * partition, not the root table.
      */
     if (node->rootResultRelInfo != NULL)
         resultRelInfo = node->rootResultRelInfo;
 
     switch (node->operation)
     {
         case CMD_INSERT:
             ExecBSInsertTriggers(node->ps.state, resultRelInfo);
             if (node->mt_onconflict == 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;
         default:
             elog(ERROR, "unknown operation");
             break;
     }
 }

static ResultRelInfo* getASTriggerResultRelInfo ( ModifyTableState * node )

static

Definition at line 1419 of file nodeModifyTable.c.

References NULL, ModifyTableState::resultRelInfo, and ModifyTableState::rootResultRelInfo.

Referenced by ExecSetupTransitionCaptureState(), and fireASTriggers().

 {
     /*
      * If the node modifies a partitioned table, we must fire its triggers.
      * Note that in that case, node->resultRelInfo points to the first leaf
      * partition, not the root table.
      */
     if (node->rootResultRelInfo != NULL)
         return node->rootResultRelInfo;
     else
         return node->resultRelInfo;
 }

Functions

Function Documentation