execAmi.c File Reference

#include "postgres.h"
#include "access/amapi.h"
#include "access/htup_details.h"
#include "catalog/pg_class.h"
#include "executor/nodeAgg.h"
#include "executor/nodeAppend.h"
#include "executor/nodeBitmapAnd.h"
#include "executor/nodeBitmapHeapscan.h"
#include "executor/nodeBitmapIndexscan.h"
#include "executor/nodeBitmapOr.h"
#include "executor/nodeCtescan.h"
#include "executor/nodeCustom.h"
#include "executor/nodeForeignscan.h"
#include "executor/nodeFunctionscan.h"
#include "executor/nodeGather.h"
#include "executor/nodeGatherMerge.h"
#include "executor/nodeGroup.h"
#include "executor/nodeHash.h"
#include "executor/nodeHashjoin.h"
#include "executor/nodeIncrementalSort.h"
#include "executor/nodeIndexonlyscan.h"
#include "executor/nodeIndexscan.h"
#include "executor/nodeLimit.h"
#include "executor/nodeLockRows.h"
#include "executor/nodeMaterial.h"
#include "executor/nodeMemoize.h"
#include "executor/nodeMergeAppend.h"
#include "executor/nodeMergejoin.h"
#include "executor/nodeModifyTable.h"
#include "executor/nodeNamedtuplestorescan.h"
#include "executor/nodeNestloop.h"
#include "executor/nodeProjectSet.h"
#include "executor/nodeRecursiveunion.h"
#include "executor/nodeResult.h"
#include "executor/nodeSamplescan.h"
#include "executor/nodeSeqscan.h"
#include "executor/nodeSetOp.h"
#include "executor/nodeSort.h"
#include "executor/nodeSubplan.h"
#include "executor/nodeSubqueryscan.h"
#include "executor/nodeTableFuncscan.h"
#include "executor/nodeTidrangescan.h"
#include "executor/nodeTidscan.h"
#include "executor/nodeUnique.h"
#include "executor/nodeValuesscan.h"
#include "executor/nodeWindowAgg.h"
#include "executor/nodeWorktablescan.h"
#include "nodes/extensible.h"
#include "nodes/pathnodes.h"
#include "utils/syscache.h"

Include dependency graph for execAmi.c:

Go to the source code of this file.

Functions
static bool	IndexSupportsBackwardScan (Oid indexid)
void	ExecReScan (PlanState *node)
void	ExecMarkPos (PlanState *node)
void	ExecRestrPos (PlanState *node)
bool	ExecSupportsMarkRestore (Path *pathnode)
bool	ExecSupportsBackwardScan (Plan *node)
bool	ExecMaterializesOutput (NodeTag plantype)

Function Documentation

ExecMarkPos()

void ExecMarkPos

(

PlanState *

node

)

Definition at line 326 of file execAmi.c.

{
    switch (nodeTag(node))
    {
        case T_IndexScanState:
            ExecIndexMarkPos((IndexScanState *) node);
            break;
 
        case T_IndexOnlyScanState:
            ExecIndexOnlyMarkPos((IndexOnlyScanState *) node);
            break;
 
        case T_CustomScanState:
            ExecCustomMarkPos((CustomScanState *) node);
            break;
 
        case T_MaterialState:
            ExecMaterialMarkPos((MaterialState *) node);
            break;
 
        case T_SortState:
            ExecSortMarkPos((SortState *) node);
            break;
 
        case T_ResultState:
            ExecResultMarkPos((ResultState *) node);
            break;
 
        default:
            /* don't make hard error unless caller asks to restore... */
            elog(DEBUG2, "unrecognized node type: %d", (int) nodeTag(node));
            break;
    }
}

References DEBUG2, elog, ExecCustomMarkPos(), ExecIndexMarkPos(), ExecIndexOnlyMarkPos(), ExecMaterialMarkPos(), ExecResultMarkPos(), ExecSortMarkPos(), and nodeTag.

Referenced by ExecMergeJoin(), and ExecResultMarkPos().

ExecMaterializesOutput()

bool ExecMaterializesOutput

(

NodeTag

plantype

)

Definition at line 635 of file execAmi.c.

{
    switch (plantype)
    {
        case T_Material:
        case T_FunctionScan:
        case T_TableFuncScan:
        case T_CteScan:
        case T_NamedTuplestoreScan:
        case T_WorkTableScan:
        case T_Sort:
            return true;
 
        default:
            break;
    }
 
    return false;
}

Referenced by build_subplan(), consider_parallel_nestloop(), cost_subplan(), and match_unsorted_outer().

ExecReScan()

void ExecReScan

(

PlanState *

node

)

Definition at line 76 of file execAmi.c.

{
    /* If collecting timing stats, update them */
    if (node->instrument)
        InstrEndLoop(node->instrument);
 
    /*
     * If we have changed parameters, propagate that info.
     *
     * Note: ExecReScanSetParamPlan() can add bits to node->chgParam,
     * corresponding to the output param(s) that the InitPlan will update.
     * Since we make only one pass over the list, that means that an InitPlan
     * can depend on the output param(s) of a sibling InitPlan only if that
     * sibling appears earlier in the list.  This is workable for now given
     * the limited ways in which one InitPlan could depend on another, but
     * eventually we might need to work harder (or else make the planner
     * enlarge the extParam/allParam sets to include the params of depended-on
     * InitPlans).
     */
    if (node->chgParam != NULL)
    {
        ListCell   *l;
 
        foreach(l, node->initPlan)
        {
            SubPlanState *sstate = (SubPlanState *) lfirst(l);
            PlanState  *splan = sstate->planstate;
 
            if (splan->plan->extParam != NULL)  /* don't care about child
                                                 * local Params */
                UpdateChangedParamSet(splan, node->chgParam);
            if (splan->chgParam != NULL)
                ExecReScanSetParamPlan(sstate, node);
        }
        foreach(l, node->subPlan)
        {
            SubPlanState *sstate = (SubPlanState *) lfirst(l);
            PlanState  *splan = sstate->planstate;
 
            if (splan->plan->extParam != NULL)
                UpdateChangedParamSet(splan, node->chgParam);
        }
        /* Well. Now set chgParam for child trees. */
        if (outerPlanState(node) != NULL)
            UpdateChangedParamSet(outerPlanState(node), node->chgParam);
        if (innerPlanState(node) != NULL)
            UpdateChangedParamSet(innerPlanState(node), node->chgParam);
    }
 
    /* Call expression callbacks */
    if (node->ps_ExprContext)
        ReScanExprContext(node->ps_ExprContext);
 
    /* And do node-type-specific processing */
    switch (nodeTag(node))
    {
        case T_ResultState:
            ExecReScanResult((ResultState *) node);
            break;
 
        case T_ProjectSetState:
            ExecReScanProjectSet((ProjectSetState *) node);
            break;
 
        case T_ModifyTableState:
            ExecReScanModifyTable((ModifyTableState *) node);
            break;
 
        case T_AppendState:
            ExecReScanAppend((AppendState *) node);
            break;
 
        case T_MergeAppendState:
            ExecReScanMergeAppend((MergeAppendState *) node);
            break;
 
        case T_RecursiveUnionState:
            ExecReScanRecursiveUnion((RecursiveUnionState *) node);
            break;
 
        case T_BitmapAndState:
            ExecReScanBitmapAnd((BitmapAndState *) node);
            break;
 
        case T_BitmapOrState:
            ExecReScanBitmapOr((BitmapOrState *) node);
            break;
 
        case T_SeqScanState:
            ExecReScanSeqScan((SeqScanState *) node);
            break;
 
        case T_SampleScanState:
            ExecReScanSampleScan((SampleScanState *) node);
            break;
 
        case T_GatherState:
            ExecReScanGather((GatherState *) node);
            break;
 
        case T_GatherMergeState:
            ExecReScanGatherMerge((GatherMergeState *) node);
            break;
 
        case T_IndexScanState:
            ExecReScanIndexScan((IndexScanState *) node);
            break;
 
        case T_IndexOnlyScanState:
            ExecReScanIndexOnlyScan((IndexOnlyScanState *) node);
            break;
 
        case T_BitmapIndexScanState:
            ExecReScanBitmapIndexScan((BitmapIndexScanState *) node);
            break;
 
        case T_BitmapHeapScanState:
            ExecReScanBitmapHeapScan((BitmapHeapScanState *) node);
            break;
 
        case T_TidScanState:
            ExecReScanTidScan((TidScanState *) node);
            break;
 
        case T_TidRangeScanState:
            ExecReScanTidRangeScan((TidRangeScanState *) node);
            break;
 
        case T_SubqueryScanState:
            ExecReScanSubqueryScan((SubqueryScanState *) node);
            break;
 
        case T_FunctionScanState:
            ExecReScanFunctionScan((FunctionScanState *) node);
            break;
 
        case T_TableFuncScanState:
            ExecReScanTableFuncScan((TableFuncScanState *) node);
            break;
 
        case T_ValuesScanState:
            ExecReScanValuesScan((ValuesScanState *) node);
            break;
 
        case T_CteScanState:
            ExecReScanCteScan((CteScanState *) node);
            break;
 
        case T_NamedTuplestoreScanState:
            ExecReScanNamedTuplestoreScan((NamedTuplestoreScanState *) node);
            break;
 
        case T_WorkTableScanState:
            ExecReScanWorkTableScan((WorkTableScanState *) node);
            break;
 
        case T_ForeignScanState:
            ExecReScanForeignScan((ForeignScanState *) node);
            break;
 
        case T_CustomScanState:
            ExecReScanCustomScan((CustomScanState *) node);
            break;
 
        case T_NestLoopState:
            ExecReScanNestLoop((NestLoopState *) node);
            break;
 
        case T_MergeJoinState:
            ExecReScanMergeJoin((MergeJoinState *) node);
            break;
 
        case T_HashJoinState:
            ExecReScanHashJoin((HashJoinState *) node);
            break;
 
        case T_MaterialState:
            ExecReScanMaterial((MaterialState *) node);
            break;
 
        case T_MemoizeState:
            ExecReScanMemoize((MemoizeState *) node);
            break;
 
        case T_SortState:
            ExecReScanSort((SortState *) node);
            break;
 
        case T_IncrementalSortState:
            ExecReScanIncrementalSort((IncrementalSortState *) node);
            break;
 
        case T_GroupState:
            ExecReScanGroup((GroupState *) node);
            break;
 
        case T_AggState:
            ExecReScanAgg((AggState *) node);
            break;
 
        case T_WindowAggState:
            ExecReScanWindowAgg((WindowAggState *) node);
            break;
 
        case T_UniqueState:
            ExecReScanUnique((UniqueState *) node);
            break;
 
        case T_HashState:
            ExecReScanHash((HashState *) node);
            break;
 
        case T_SetOpState:
            ExecReScanSetOp((SetOpState *) node);
            break;
 
        case T_LockRowsState:
            ExecReScanLockRows((LockRowsState *) node);
            break;
 
        case T_LimitState:
            ExecReScanLimit((LimitState *) node);
            break;
 
        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
            break;
    }
 
    if (node->chgParam != NULL)
    {
        bms_free(node->chgParam);
        node->chgParam = NULL;
    }
}

References bms_free(), PlanState::chgParam, elog, ERROR, ExecReScanAgg(), ExecReScanAppend(), ExecReScanBitmapAnd(), ExecReScanBitmapHeapScan(), ExecReScanBitmapIndexScan(), ExecReScanBitmapOr(), ExecReScanCteScan(), ExecReScanCustomScan(), ExecReScanForeignScan(), ExecReScanFunctionScan(), ExecReScanGather(), ExecReScanGatherMerge(), ExecReScanGroup(), ExecReScanHash(), ExecReScanHashJoin(), ExecReScanIncrementalSort(), ExecReScanIndexOnlyScan(), ExecReScanIndexScan(), ExecReScanLimit(), ExecReScanLockRows(), ExecReScanMaterial(), ExecReScanMemoize(), ExecReScanMergeAppend(), ExecReScanMergeJoin(), ExecReScanModifyTable(), ExecReScanNamedTuplestoreScan(), ExecReScanNestLoop(), ExecReScanProjectSet(), ExecReScanRecursiveUnion(), ExecReScanResult(), ExecReScanSampleScan(), ExecReScanSeqScan(), ExecReScanSetOp(), ExecReScanSetParamPlan(), ExecReScanSort(), ExecReScanSubqueryScan(), ExecReScanTableFuncScan(), ExecReScanTidRangeScan(), ExecReScanTidScan(), ExecReScanUnique(), ExecReScanValuesScan(), ExecReScanWindowAgg(), ExecReScanWorkTableScan(), PlanState::initPlan, innerPlanState, InstrEndLoop(), PlanState::instrument, lfirst, nodeTag, outerPlanState, SubPlanState::planstate, PlanState::ps_ExprContext, ReScanExprContext(), splan, PlanState::subPlan, and UpdateChangedParamSet().

Referenced by buildSubPlanHash(), ExecAsyncRequest(), ExecIndexOnlyScan(), ExecIndexScan(), ExecNestLoop(), ExecProcNode(), ExecReScanAgg(), ExecReScanAppend(), ExecReScanBitmapAnd(), ExecReScanBitmapHeapScan(), ExecReScanBitmapOr(), ExecReScanForeignScan(), ExecReScanGather(), ExecReScanGatherMerge(), ExecReScanGroup(), ExecReScanHash(), ExecReScanHashJoin(), ExecReScanIncrementalSort(), ExecReScanLimit(), ExecReScanLockRows(), ExecReScanMaterial(), ExecReScanMemoize(), ExecReScanMergeAppend(), ExecReScanMergeJoin(), ExecReScanNestLoop(), ExecReScanProjectSet(), ExecReScanRecursiveUnion(), ExecReScanResult(), ExecReScanSetOp(), ExecReScanSort(), ExecReScanSubqueryScan(), ExecReScanUnique(), ExecReScanWindowAgg(), ExecScanSubPlan(), ExecutorRewind(), MultiExecBitmapIndexScan(), and MultiExecProcNode().

ExecRestrPos()

void ExecRestrPos

(

PlanState *

node

)

Definition at line 375 of file execAmi.c.

{
    switch (nodeTag(node))
    {
        case T_IndexScanState:
            ExecIndexRestrPos((IndexScanState *) node);
            break;
 
        case T_IndexOnlyScanState:
            ExecIndexOnlyRestrPos((IndexOnlyScanState *) node);
            break;
 
        case T_CustomScanState:
            ExecCustomRestrPos((CustomScanState *) node);
            break;
 
        case T_MaterialState:
            ExecMaterialRestrPos((MaterialState *) node);
            break;
 
        case T_SortState:
            ExecSortRestrPos((SortState *) node);
            break;
 
        case T_ResultState:
            ExecResultRestrPos((ResultState *) node);
            break;
 
        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
            break;
    }
}

References elog, ERROR, ExecCustomRestrPos(), ExecIndexOnlyRestrPos(), ExecIndexRestrPos(), ExecMaterialRestrPos(), ExecResultRestrPos(), ExecSortRestrPos(), and nodeTag.

Referenced by ExecMergeJoin(), and ExecResultRestrPos().

ExecSupportsBackwardScan()

bool ExecSupportsBackwardScan

(

Plan *

node

)

Definition at line 510 of file execAmi.c.

{
    if (node == NULL)
        return false;
 
    /*
     * Parallel-aware nodes return a subset of the tuples in each worker, and
     * in general we can't expect to have enough bookkeeping state to know
     * which ones we returned in this worker as opposed to some other worker.
     */
    if (node->parallel_aware)
        return false;
 
    switch (nodeTag(node))
    {
        case T_Result:
            if (outerPlan(node) != NULL)
                return ExecSupportsBackwardScan(outerPlan(node));
            else
                return false;
 
        case T_Append:
            {
                ListCell   *l;
 
                /* With async, tuples may be interleaved, so can't back up. */
                if (((Append *) node)->nasyncplans > 0)
                    return false;
 
                foreach(l, ((Append *) node)->appendplans)
                {
                    if (!ExecSupportsBackwardScan((Plan *) lfirst(l)))
                        return false;
                }
                /* need not check tlist because Append doesn't evaluate it */
                return true;
            }
 
        case T_SampleScan:
            /* Simplify life for tablesample methods by disallowing this */
            return false;
 
        case T_Gather:
            return false;
 
        case T_IndexScan:
            return IndexSupportsBackwardScan(((IndexScan *) node)->indexid);
 
        case T_IndexOnlyScan:
            return IndexSupportsBackwardScan(((IndexOnlyScan *) node)->indexid);
 
        case T_SubqueryScan:
            return ExecSupportsBackwardScan(((SubqueryScan *) node)->subplan);
 
        case T_CustomScan:
            if (((CustomScan *) node)->flags & CUSTOMPATH_SUPPORT_BACKWARD_SCAN)
                return true;
            return false;
 
        case T_SeqScan:
        case T_TidScan:
        case T_TidRangeScan:
        case T_FunctionScan:
        case T_ValuesScan:
        case T_CteScan:
        case T_Material:
        case T_Sort:
            /* these don't evaluate tlist */
            return true;
 
        case T_IncrementalSort:
 
            /*
             * Unlike full sort, incremental sort keeps only a single group of
             * tuples in memory, so it can't scan backwards.
             */
            return false;
 
        case T_LockRows:
        case T_Limit:
            return ExecSupportsBackwardScan(outerPlan(node));
 
        default:
            return false;
    }
}

References CUSTOMPATH_SUPPORT_BACKWARD_SCAN, IndexSupportsBackwardScan(), lfirst, nodeTag, outerPlan, and Plan::parallel_aware.

Referenced by PerformCursorOpen(), SPI_cursor_open_internal(), and standard_planner().

ExecSupportsMarkRestore()

bool ExecSupportsMarkRestore

(

Path *

pathnode

)

Definition at line 417 of file execAmi.c.

{
    /*
     * For consistency with the routines above, we do not examine the nodeTag
     * but rather the pathtype, which is the Plan node type the Path would
     * produce.
     */
    switch (pathnode->pathtype)
    {
        case T_IndexScan:
        case T_IndexOnlyScan:
 
            /*
             * Not all index types support mark/restore.
             */
            return castNode(IndexPath, pathnode)->indexinfo->amcanmarkpos;
 
        case T_Material:
        case T_Sort:
            return true;
 
        case T_CustomScan:
            if (castNode(CustomPath, pathnode)->flags & CUSTOMPATH_SUPPORT_MARK_RESTORE)
                return true;
            return false;
 
        case T_Result:
 
            /*
             * Result supports mark/restore iff it has a child plan that does.
             *
             * We have to be careful here because there is more than one Path
             * type that can produce a Result plan node.
             */
            if (IsA(pathnode, ProjectionPath))
                return ExecSupportsMarkRestore(((ProjectionPath *) pathnode)->subpath);
            else if (IsA(pathnode, MinMaxAggPath))
                return false;   /* childless Result */
            else if (IsA(pathnode, GroupResultPath))
                return false;   /* childless Result */
            else
            {
                /* Simple RTE_RESULT base relation */
                Assert(IsA(pathnode, Path));
                return false;   /* childless Result */
            }
 
        case T_Append:
            {
                AppendPath *appendPath = castNode(AppendPath, pathnode);
 
                /*
                 * If there's exactly one child, then there will be no Append
                 * in the final plan, so we can handle mark/restore if the
                 * child plan node can.
                 */
                if (list_length(appendPath->subpaths) == 1)
                    return ExecSupportsMarkRestore((Path *) linitial(appendPath->subpaths));
                /* Otherwise, Append can't handle it */
                return false;
            }
 
        case T_MergeAppend:
            {
                MergeAppendPath *mapath = castNode(MergeAppendPath, pathnode);
 
                /*
                 * Like the Append case above, single-subpath MergeAppends
                 * won't be in the final plan, so just return the child's
                 * mark/restore ability.
                 */
                if (list_length(mapath->subpaths) == 1)
                    return ExecSupportsMarkRestore((Path *) linitial(mapath->subpaths));
                /* Otherwise, MergeAppend can't handle it */
                return false;
            }
 
        default:
            break;
    }
 
    return false;
}

References Assert, castNode, CUSTOMPATH_SUPPORT_MARK_RESTORE, IsA, linitial, list_length(), Path::pathtype, subpath(), AppendPath::subpaths, and MergeAppendPath::subpaths.

Referenced by final_cost_mergejoin().

IndexSupportsBackwardScan()

static bool IndexSupportsBackwardScan ( Oid  indexid )

static

Definition at line 602 of file execAmi.c.

{
    bool        result;
    HeapTuple   ht_idxrel;
    Form_pg_class idxrelrec;
    IndexAmRoutine *amroutine;
 
    /* Fetch the pg_class tuple of the index relation */
    ht_idxrel = SearchSysCache1(RELOID, ObjectIdGetDatum(indexid));
    if (!HeapTupleIsValid(ht_idxrel))
        elog(ERROR, "cache lookup failed for relation %u", indexid);
    idxrelrec = (Form_pg_class) GETSTRUCT(ht_idxrel);
 
    /* Fetch the index AM's API struct */
    amroutine = GetIndexAmRoutineByAmId(idxrelrec->relam, false);
 
    result = amroutine->amcanbackward;
 
    pfree(amroutine);
    ReleaseSysCache(ht_idxrel);
 
    return result;
}

References IndexAmRoutine::amcanbackward, elog, ERROR, GetIndexAmRoutineByAmId(), GETSTRUCT, HeapTupleIsValid, ObjectIdGetDatum(), pfree(), ReleaseSysCache(), and SearchSysCache1().

Referenced by ExecSupportsBackwardScan().