execProcnode.c File Reference

#include "postgres.h"
#include "executor/executor.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/nodeIndexonlyscan.h"
#include "executor/nodeIndexscan.h"
#include "executor/nodeLimit.h"
#include "executor/nodeLockRows.h"
#include "executor/nodeMaterial.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/nodeTidscan.h"
#include "executor/nodeUnique.h"
#include "executor/nodeValuesscan.h"
#include "executor/nodeWindowAgg.h"
#include "executor/nodeWorktablescan.h"
#include "nodes/nodeFuncs.h"
#include "miscadmin.h"

Include dependency graph for execProcnode.c:

Go to the source code of this file.

Functions
static TupleTableSlot *	ExecProcNodeFirst (PlanState *node)
static TupleTableSlot *	ExecProcNodeInstr (PlanState *node)
PlanState *	ExecInitNode (Plan *node, EState *estate, int eflags)
void	ExecSetExecProcNode (PlanState *node, ExecProcNodeMtd function)
Node *	MultiExecProcNode (PlanState *node)
void	ExecEndNode (PlanState *node)
bool	ExecShutdownNode (PlanState *node)
void	ExecSetTupleBound (int64 tuples_needed, PlanState *child_node)

Function Documentation

ExecEndNode()

void ExecEndNode

(

PlanState *

node

)

Definition at line 539 of file execProcnode.c.

References bms_free(), check_stack_depth(), PlanState::chgParam, elog, ERROR, ExecEndAgg(), ExecEndAppend(), ExecEndBitmapAnd(), ExecEndBitmapHeapScan(), ExecEndBitmapIndexScan(), ExecEndBitmapOr(), ExecEndCteScan(), ExecEndCustomScan(), ExecEndForeignScan(), ExecEndFunctionScan(), ExecEndGather(), ExecEndGatherMerge(), ExecEndGroup(), ExecEndHash(), ExecEndHashJoin(), ExecEndIndexOnlyScan(), ExecEndIndexScan(), ExecEndLimit(), ExecEndLockRows(), ExecEndMaterial(), ExecEndMergeAppend(), ExecEndMergeJoin(), ExecEndModifyTable(), ExecEndNamedTuplestoreScan(), ExecEndNestLoop(), ExecEndProjectSet(), ExecEndRecursiveUnion(), ExecEndResult(), ExecEndSampleScan(), ExecEndSeqScan(), ExecEndSetOp(), ExecEndSort(), ExecEndSubqueryScan(), ExecEndTableFuncScan(), ExecEndTidScan(), ExecEndUnique(), ExecEndValuesScan(), ExecEndWindowAgg(), ExecEndWorkTableScan(), nodeTag, T_AggState, T_AppendState, T_BitmapAndState, T_BitmapHeapScanState, T_BitmapIndexScanState, T_BitmapOrState, T_CteScanState, T_CustomScanState, T_ForeignScanState, T_FunctionScanState, T_GatherMergeState, T_GatherState, T_GroupState, T_HashJoinState, T_HashState, T_IndexOnlyScanState, T_IndexScanState, T_LimitState, T_LockRowsState, T_MaterialState, T_MergeAppendState, T_MergeJoinState, T_ModifyTableState, T_NamedTuplestoreScanState, T_NestLoopState, T_ProjectSetState, T_RecursiveUnionState, T_ResultState, T_SampleScanState, T_SeqScanState, T_SetOpState, T_SortState, T_SubqueryScanState, T_TableFuncScanState, T_TidScanState, T_UniqueState, T_ValuesScanState, T_WindowAggState, and T_WorkTableScanState.

Referenced by EvalPlanQualEnd(), ExecEndAgg(), ExecEndAppend(), ExecEndBitmapAnd(), ExecEndBitmapHeapScan(), ExecEndBitmapOr(), ExecEndForeignScan(), ExecEndGather(), ExecEndGatherMerge(), ExecEndGroup(), ExecEndHash(), ExecEndHashJoin(), ExecEndLimit(), ExecEndLockRows(), ExecEndMaterial(), ExecEndMergeAppend(), ExecEndMergeJoin(), ExecEndModifyTable(), ExecEndNestLoop(), ExecEndPlan(), ExecEndProjectSet(), ExecEndRecursiveUnion(), ExecEndResult(), ExecEndSetOp(), ExecEndSort(), ExecEndSubqueryScan(), ExecEndUnique(), and ExecEndWindowAgg().

{
    /*
     * do nothing when we get to the end of a leaf on tree.
     */
    if (node == NULL)
        return;

    /*
     * Make sure there's enough stack available. Need to check here, in
     * addition to ExecProcNode() (via ExecProcNodeFirst()), because it's not
     * guaranteed that ExecProcNode() is reached for all nodes.
     */
    check_stack_depth();

    if (node->chgParam != NULL)
    {
        bms_free(node->chgParam);
        node->chgParam = NULL;
    }

    switch (nodeTag(node))
    {
            /*
             * control nodes
             */
        case T_ResultState:
            ExecEndResult((ResultState *) node);
            break;

        case T_ProjectSetState:
            ExecEndProjectSet((ProjectSetState *) node);
            break;

        case T_ModifyTableState:
            ExecEndModifyTable((ModifyTableState *) node);
            break;

        case T_AppendState:
            ExecEndAppend((AppendState *) node);
            break;

        case T_MergeAppendState:
            ExecEndMergeAppend((MergeAppendState *) node);
            break;

        case T_RecursiveUnionState:
            ExecEndRecursiveUnion((RecursiveUnionState *) node);
            break;

        case T_BitmapAndState:
            ExecEndBitmapAnd((BitmapAndState *) node);
            break;

        case T_BitmapOrState:
            ExecEndBitmapOr((BitmapOrState *) node);
            break;

            /*
             * scan nodes
             */
        case T_SeqScanState:
            ExecEndSeqScan((SeqScanState *) node);
            break;

        case T_SampleScanState:
            ExecEndSampleScan((SampleScanState *) node);
            break;

        case T_GatherState:
            ExecEndGather((GatherState *) node);
            break;

        case T_GatherMergeState:
            ExecEndGatherMerge((GatherMergeState *) node);
            break;

        case T_IndexScanState:
            ExecEndIndexScan((IndexScanState *) node);
            break;

        case T_IndexOnlyScanState:
            ExecEndIndexOnlyScan((IndexOnlyScanState *) node);
            break;

        case T_BitmapIndexScanState:
            ExecEndBitmapIndexScan((BitmapIndexScanState *) node);
            break;

        case T_BitmapHeapScanState:
            ExecEndBitmapHeapScan((BitmapHeapScanState *) node);
            break;

        case T_TidScanState:
            ExecEndTidScan((TidScanState *) node);
            break;

        case T_SubqueryScanState:
            ExecEndSubqueryScan((SubqueryScanState *) node);
            break;

        case T_FunctionScanState:
            ExecEndFunctionScan((FunctionScanState *) node);
            break;

        case T_TableFuncScanState:
            ExecEndTableFuncScan((TableFuncScanState *) node);
            break;

        case T_ValuesScanState:
            ExecEndValuesScan((ValuesScanState *) node);
            break;

        case T_CteScanState:
            ExecEndCteScan((CteScanState *) node);
            break;

        case T_NamedTuplestoreScanState:
            ExecEndNamedTuplestoreScan((NamedTuplestoreScanState *) node);
            break;

        case T_WorkTableScanState:
            ExecEndWorkTableScan((WorkTableScanState *) node);
            break;

        case T_ForeignScanState:
            ExecEndForeignScan((ForeignScanState *) node);
            break;

        case T_CustomScanState:
            ExecEndCustomScan((CustomScanState *) node);
            break;

            /*
             * join nodes
             */
        case T_NestLoopState:
            ExecEndNestLoop((NestLoopState *) node);
            break;

        case T_MergeJoinState:
            ExecEndMergeJoin((MergeJoinState *) node);
            break;

        case T_HashJoinState:
            ExecEndHashJoin((HashJoinState *) node);
            break;

            /*
             * materialization nodes
             */
        case T_MaterialState:
            ExecEndMaterial((MaterialState *) node);
            break;

        case T_SortState:
            ExecEndSort((SortState *) node);
            break;

        case T_GroupState:
            ExecEndGroup((GroupState *) node);
            break;

        case T_AggState:
            ExecEndAgg((AggState *) node);
            break;

        case T_WindowAggState:
            ExecEndWindowAgg((WindowAggState *) node);
            break;

        case T_UniqueState:
            ExecEndUnique((UniqueState *) node);
            break;

        case T_HashState:
            ExecEndHash((HashState *) node);
            break;

        case T_SetOpState:
            ExecEndSetOp((SetOpState *) node);
            break;

        case T_LockRowsState:
            ExecEndLockRows((LockRowsState *) node);
            break;

        case T_LimitState:
            ExecEndLimit((LimitState *) node);
            break;

        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
            break;
    }
}

ExecInitNode()

PlanState* ExecInitNode	(	Plan *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 139 of file execProcnode.c.

References Assert, check_stack_depth(), elog, ERROR, EState::es_instrument, ExecInitAgg(), ExecInitAppend(), ExecInitBitmapAnd(), ExecInitBitmapHeapScan(), ExecInitBitmapIndexScan(), ExecInitBitmapOr(), ExecInitCteScan(), ExecInitCustomScan(), ExecInitForeignScan(), ExecInitFunctionScan(), ExecInitGather(), ExecInitGatherMerge(), ExecInitGroup(), ExecInitHash(), ExecInitHashJoin(), ExecInitIndexOnlyScan(), ExecInitIndexScan(), ExecInitLimit(), ExecInitLockRows(), ExecInitMaterial(), ExecInitMergeAppend(), ExecInitMergeJoin(), ExecInitModifyTable(), ExecInitNamedTuplestoreScan(), ExecInitNestLoop(), ExecInitProjectSet(), ExecInitRecursiveUnion(), ExecInitResult(), ExecInitSampleScan(), ExecInitSeqScan(), ExecInitSetOp(), ExecInitSort(), ExecInitSubPlan(), ExecInitSubqueryScan(), ExecInitTableFuncScan(), ExecInitTidScan(), ExecInitUnique(), ExecInitValuesScan(), ExecInitWindowAgg(), ExecInitWorkTableScan(), PlanState::ExecProcNode, ExecSetExecProcNode(), Plan::initPlan, PlanState::initPlan, InstrAlloc(), PlanState::instrument, IsA, lappend(), lfirst, NIL, nodeTag, T_Agg, T_Append, T_BitmapAnd, T_BitmapHeapScan, T_BitmapIndexScan, T_BitmapOr, T_CteScan, T_CustomScan, T_ForeignScan, T_FunctionScan, T_Gather, T_GatherMerge, T_Group, T_Hash, T_HashJoin, T_IndexOnlyScan, T_IndexScan, T_Limit, T_LockRows, T_Material, T_MergeAppend, T_MergeJoin, T_ModifyTable, T_NamedTuplestoreScan, T_NestLoop, T_ProjectSet, T_RecursiveUnion, T_Result, T_SampleScan, T_SeqScan, T_SetOp, T_Sort, T_SubqueryScan, T_TableFuncScan, T_TidScan, T_Unique, T_ValuesScan, T_WindowAgg, and T_WorkTableScan.

Referenced by EvalPlanQualStart(), ExecInitAgg(), ExecInitAppend(), ExecInitBitmapAnd(), ExecInitBitmapHeapScan(), ExecInitBitmapOr(), ExecInitForeignScan(), ExecInitGather(), ExecInitGatherMerge(), ExecInitGroup(), ExecInitHash(), ExecInitHashJoin(), ExecInitLimit(), ExecInitLockRows(), ExecInitMaterial(), ExecInitMergeAppend(), ExecInitMergeJoin(), ExecInitModifyTable(), ExecInitNestLoop(), ExecInitProjectSet(), ExecInitRecursiveUnion(), ExecInitResult(), ExecInitSetOp(), ExecInitSort(), ExecInitSubqueryScan(), ExecInitUnique(), ExecInitWindowAgg(), and InitPlan().

{
    PlanState  *result;
    List       *subps;
    ListCell   *l;

    /*
     * do nothing when we get to the end of a leaf on tree.
     */
    if (node == NULL)
        return NULL;

    /*
     * Make sure there's enough stack available. Need to check here, in
     * addition to ExecProcNode() (via ExecProcNodeFirst()), to ensure the
     * stack isn't overrun while initializing the node tree.
     */
    check_stack_depth();

    switch (nodeTag(node))
    {
            /*
             * control nodes
             */
        case T_Result:
            result = (PlanState *) ExecInitResult((Result *) node,
                                                  estate, eflags);
            break;

        case T_ProjectSet:
            result = (PlanState *) ExecInitProjectSet((ProjectSet *) node,
                                                      estate, eflags);
            break;

        case T_ModifyTable:
            result = (PlanState *) ExecInitModifyTable((ModifyTable *) node,
                                                       estate, eflags);
            break;

        case T_Append:
            result = (PlanState *) ExecInitAppend((Append *) node,
                                                  estate, eflags);
            break;

        case T_MergeAppend:
            result = (PlanState *) ExecInitMergeAppend((MergeAppend *) node,
                                                       estate, eflags);
            break;

        case T_RecursiveUnion:
            result = (PlanState *) ExecInitRecursiveUnion((RecursiveUnion *) node,
                                                          estate, eflags);
            break;

        case T_BitmapAnd:
            result = (PlanState *) ExecInitBitmapAnd((BitmapAnd *) node,
                                                     estate, eflags);
            break;

        case T_BitmapOr:
            result = (PlanState *) ExecInitBitmapOr((BitmapOr *) node,
                                                    estate, eflags);
            break;

            /*
             * scan nodes
             */
        case T_SeqScan:
            result = (PlanState *) ExecInitSeqScan((SeqScan *) node,
                                                   estate, eflags);
            break;

        case T_SampleScan:
            result = (PlanState *) ExecInitSampleScan((SampleScan *) node,
                                                      estate, eflags);
            break;

        case T_IndexScan:
            result = (PlanState *) ExecInitIndexScan((IndexScan *) node,
                                                     estate, eflags);
            break;

        case T_IndexOnlyScan:
            result = (PlanState *) ExecInitIndexOnlyScan((IndexOnlyScan *) node,
                                                         estate, eflags);
            break;

        case T_BitmapIndexScan:
            result = (PlanState *) ExecInitBitmapIndexScan((BitmapIndexScan *) node,
                                                           estate, eflags);
            break;

        case T_BitmapHeapScan:
            result = (PlanState *) ExecInitBitmapHeapScan((BitmapHeapScan *) node,
                                                          estate, eflags);
            break;

        case T_TidScan:
            result = (PlanState *) ExecInitTidScan((TidScan *) node,
                                                   estate, eflags);
            break;

        case T_SubqueryScan:
            result = (PlanState *) ExecInitSubqueryScan((SubqueryScan *) node,
                                                        estate, eflags);
            break;

        case T_FunctionScan:
            result = (PlanState *) ExecInitFunctionScan((FunctionScan *) node,
                                                        estate, eflags);
            break;

        case T_TableFuncScan:
            result = (PlanState *) ExecInitTableFuncScan((TableFuncScan *) node,
                                                         estate, eflags);
            break;

        case T_ValuesScan:
            result = (PlanState *) ExecInitValuesScan((ValuesScan *) node,
                                                      estate, eflags);
            break;

        case T_CteScan:
            result = (PlanState *) ExecInitCteScan((CteScan *) node,
                                                   estate, eflags);
            break;

        case T_NamedTuplestoreScan:
            result = (PlanState *) ExecInitNamedTuplestoreScan((NamedTuplestoreScan *) node,
                                                               estate, eflags);
            break;

        case T_WorkTableScan:
            result = (PlanState *) ExecInitWorkTableScan((WorkTableScan *) node,
                                                         estate, eflags);
            break;

        case T_ForeignScan:
            result = (PlanState *) ExecInitForeignScan((ForeignScan *) node,
                                                       estate, eflags);
            break;

        case T_CustomScan:
            result = (PlanState *) ExecInitCustomScan((CustomScan *) node,
                                                      estate, eflags);
            break;

            /*
             * join nodes
             */
        case T_NestLoop:
            result = (PlanState *) ExecInitNestLoop((NestLoop *) node,
                                                    estate, eflags);
            break;

        case T_MergeJoin:
            result = (PlanState *) ExecInitMergeJoin((MergeJoin *) node,
                                                     estate, eflags);
            break;

        case T_HashJoin:
            result = (PlanState *) ExecInitHashJoin((HashJoin *) node,
                                                    estate, eflags);
            break;

            /*
             * materialization nodes
             */
        case T_Material:
            result = (PlanState *) ExecInitMaterial((Material *) node,
                                                    estate, eflags);
            break;

        case T_Sort:
            result = (PlanState *) ExecInitSort((Sort *) node,
                                                estate, eflags);
            break;

        case T_Group:
            result = (PlanState *) ExecInitGroup((Group *) node,
                                                 estate, eflags);
            break;

        case T_Agg:
            result = (PlanState *) ExecInitAgg((Agg *) node,
                                               estate, eflags);
            break;

        case T_WindowAgg:
            result = (PlanState *) ExecInitWindowAgg((WindowAgg *) node,
                                                     estate, eflags);
            break;

        case T_Unique:
            result = (PlanState *) ExecInitUnique((Unique *) node,
                                                  estate, eflags);
            break;

        case T_Gather:
            result = (PlanState *) ExecInitGather((Gather *) node,
                                                  estate, eflags);
            break;

        case T_GatherMerge:
            result = (PlanState *) ExecInitGatherMerge((GatherMerge *) node,
                                                       estate, eflags);
            break;

        case T_Hash:
            result = (PlanState *) ExecInitHash((Hash *) node,
                                                estate, eflags);
            break;

        case T_SetOp:
            result = (PlanState *) ExecInitSetOp((SetOp *) node,
                                                 estate, eflags);
            break;

        case T_LockRows:
            result = (PlanState *) ExecInitLockRows((LockRows *) node,
                                                    estate, eflags);
            break;

        case T_Limit:
            result = (PlanState *) ExecInitLimit((Limit *) node,
                                                 estate, eflags);
            break;

        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
            result = NULL;      /* keep compiler quiet */
            break;
    }

    ExecSetExecProcNode(result, result->ExecProcNode);

    /*
     * Initialize any initPlans present in this node.  The planner put them in
     * a separate list for us.
     */
    subps = NIL;
    foreach(l, node->initPlan)
    {
        SubPlan    *subplan = (SubPlan *) lfirst(l);
        SubPlanState *sstate;

        Assert(IsA(subplan, SubPlan));
        sstate = ExecInitSubPlan(subplan, result);
        subps = lappend(subps, sstate);
    }
    result->initPlan = subps;

    /* Set up instrumentation for this node if requested */
    if (estate->es_instrument)
        result->instrument = InstrAlloc(1, estate->es_instrument);

    return result;
}

ExecProcNodeFirst()

static TupleTableSlot * ExecProcNodeFirst ( PlanState *  node )

static

Definition at line 425 of file execProcnode.c.

References check_stack_depth(), PlanState::ExecProcNode, ExecProcNodeInstr(), PlanState::ExecProcNodeReal, and PlanState::instrument.

Referenced by ExecSetExecProcNode().

{
    /*
     * Perform stack depth check during the first execution of the node.  We
     * only do so the first time round because it turns out to not be cheap on
     * some common architectures (eg. x86).  This relies on the assumption
     * that ExecProcNode calls for a given plan node will always be made at
     * roughly the same stack depth.
     */
    check_stack_depth();

    /*
     * If instrumentation is required, change the wrapper to one that just
     * does instrumentation.  Otherwise we can dispense with all wrappers and
     * have ExecProcNode() directly call the relevant function from now on.
     */
    if (node->instrument)
        node->ExecProcNode = ExecProcNodeInstr;
    else
        node->ExecProcNode = node->ExecProcNodeReal;

    return node->ExecProcNode(node);
}

ExecProcNodeInstr()

static TupleTableSlot * ExecProcNodeInstr ( PlanState *  node )

static

Definition at line 456 of file execProcnode.c.

References PlanState::ExecProcNodeReal, InstrStartNode(), InstrStopNode(), PlanState::instrument, and TupIsNull.

Referenced by ExecProcNodeFirst().

{
    TupleTableSlot *result;

    InstrStartNode(node->instrument);

    result = node->ExecProcNodeReal(node);

    InstrStopNode(node->instrument, TupIsNull(result) ? 0.0 : 1.0);

    return result;
}

ExecSetExecProcNode()

void ExecSetExecProcNode	(	PlanState *	node,
		ExecProcNodeMtd	function
	)

Definition at line 406 of file execProcnode.c.

References PlanState::ExecProcNode, ExecProcNodeFirst(), and PlanState::ExecProcNodeReal.

Referenced by ExecHashJoinInitializeDSM(), ExecHashJoinInitializeWorker(), and ExecInitNode().

{
    /*
     * Add a wrapper around the ExecProcNode callback that checks stack depth
     * during the first execution and maybe adds an instrumentation
     * wrapper. When the callback is changed after execution has already begun
     * that means we'll superfluously execute ExecProcNodeFirst, but that seems
     * ok.
     */
    node->ExecProcNodeReal = function;
    node->ExecProcNode = ExecProcNodeFirst;
}

ExecSetTupleBound()

void ExecSetTupleBound	(	int64	tuples_needed,
		PlanState *	child_node
	)

Definition at line 800 of file execProcnode.c.

References SortState::bound, SortState::bounded, ExecSetTupleBound(), i, IsA, MergeAppendState::mergeplans, MergeAppendState::ms_nplans, outerPlanState, ScanState::ps, PlanState::qual, SubqueryScanState::ss, SubqueryScanState::subplan, GatherState::tuples_needed, and GatherMergeState::tuples_needed.

Referenced by ExecSetTupleBound(), ParallelQueryMain(), and recompute_limits().

{
    /*
     * Since this function recurses, in principle we should check stack depth
     * here.  In practice, it's probably pointless since the earlier node
     * initialization tree traversal would surely have consumed more stack.
     */

    if (IsA(child_node, SortState))
    {
        /*
         * If it is a Sort node, notify it that it can use bounded sort.
         *
         * Note: it is the responsibility of nodeSort.c to react properly to
         * changes of these parameters.  If we ever redesign this, it'd be a
         * good idea to integrate this signaling with the parameter-change
         * mechanism.
         */
        SortState  *sortState = (SortState *) child_node;

        if (tuples_needed < 0)
        {
            /* make sure flag gets reset if needed upon rescan */
            sortState->bounded = false;
        }
        else
        {
            sortState->bounded = true;
            sortState->bound = tuples_needed;
        }
    }
    else if (IsA(child_node, MergeAppendState))
    {
        /*
         * If it is a MergeAppend, we can apply the bound to any nodes that
         * are children of the MergeAppend, since the MergeAppend surely need
         * read no more than that many tuples from any one input.
         */
        MergeAppendState *maState = (MergeAppendState *) child_node;
        int         i;

        for (i = 0; i < maState->ms_nplans; i++)
            ExecSetTupleBound(tuples_needed, maState->mergeplans[i]);
    }
    else if (IsA(child_node, ResultState))
    {
        /*
         * Similarly, for a projecting Result, we can apply the bound to its
         * child node.
         *
         * If Result supported qual checking, we'd have to punt on seeing a
         * qual.  Note that having a resconstantqual is not a showstopper: if
         * that condition succeeds it affects nothing, while if it fails, no
         * rows will be demanded from the Result child anyway.
         */
        if (outerPlanState(child_node))
            ExecSetTupleBound(tuples_needed, outerPlanState(child_node));
    }
    else if (IsA(child_node, SubqueryScanState))
    {
        /*
         * We can also descend through SubqueryScan, but only if it has no
         * qual (otherwise it might discard rows).
         */
        SubqueryScanState *subqueryState = (SubqueryScanState *) child_node;

        if (subqueryState->ss.ps.qual == NULL)
            ExecSetTupleBound(tuples_needed, subqueryState->subplan);
    }
    else if (IsA(child_node, GatherState))
    {
        /*
         * A Gather node can propagate the bound to its workers.  As with
         * MergeAppend, no one worker could possibly need to return more
         * tuples than the Gather itself needs to.
         *
         * Note: As with Sort, the Gather node is responsible for reacting
         * properly to changes to this parameter.
         */
        GatherState *gstate = (GatherState *) child_node;

        gstate->tuples_needed = tuples_needed;

        /* Also pass down the bound to our own copy of the child plan */
        ExecSetTupleBound(tuples_needed, outerPlanState(child_node));
    }
    else if (IsA(child_node, GatherMergeState))
    {
        /* Same comments as for Gather */
        GatherMergeState *gstate = (GatherMergeState *) child_node;

        gstate->tuples_needed = tuples_needed;

        ExecSetTupleBound(tuples_needed, outerPlanState(child_node));
    }

    /*
     * In principle we could descend through any plan node type that is
     * certain not to discard or combine input rows; but on seeing a node that
     * can do that, we can't propagate the bound any further.  For the moment
     * it's unclear that any other cases are worth checking here.
     */
}

ExecShutdownNode()

bool ExecShutdownNode

(

PlanState *

node

)

Definition at line 747 of file execProcnode.c.

References check_stack_depth(), ExecShutdownCustomScan(), ExecShutdownForeignScan(), ExecShutdownGather(), ExecShutdownGatherMerge(), ExecShutdownHash(), ExecShutdownHashJoin(), ExecShutdownNode(), nodeTag, planstate_tree_walker(), T_CustomScanState, T_ForeignScanState, T_GatherMergeState, T_GatherState, T_HashJoinState, and T_HashState.

Referenced by ExecShutdownNode(), and ExecutePlan().

{
    if (node == NULL)
        return false;

    check_stack_depth();

    planstate_tree_walker(node, ExecShutdownNode, NULL);

    switch (nodeTag(node))
    {
        case T_GatherState:
            ExecShutdownGather((GatherState *) node);
            break;
        case T_ForeignScanState:
            ExecShutdownForeignScan((ForeignScanState *) node);
            break;
        case T_CustomScanState:
            ExecShutdownCustomScan((CustomScanState *) node);
            break;
        case T_GatherMergeState:
            ExecShutdownGatherMerge((GatherMergeState *) node);
            break;
        case T_HashState:
            ExecShutdownHash((HashState *) node);
            break;
        case T_HashJoinState:
            ExecShutdownHashJoin((HashJoinState *) node);
            break;
        default:
            break;
    }

    return false;
}

MultiExecProcNode()

Node* MultiExecProcNode

(

PlanState *

node

)

Definition at line 484 of file execProcnode.c.

References CHECK_FOR_INTERRUPTS, check_stack_depth(), PlanState::chgParam, elog, ERROR, ExecReScan(), MultiExecBitmapAnd(), MultiExecBitmapIndexScan(), MultiExecBitmapOr(), MultiExecHash(), nodeTag, T_BitmapAndState, T_BitmapIndexScanState, T_BitmapOrState, and T_HashState.

Referenced by BitmapHeapNext(), ExecHashJoinImpl(), MultiExecBitmapAnd(), and MultiExecBitmapOr().

{
    Node       *result;

    check_stack_depth();

    CHECK_FOR_INTERRUPTS();

    if (node->chgParam != NULL) /* something changed */
        ExecReScan(node);       /* let ReScan handle this */

    switch (nodeTag(node))
    {
            /*
             * Only node types that actually support multiexec will be listed
             */

        case T_HashState:
            result = MultiExecHash((HashState *) node);
            break;

        case T_BitmapIndexScanState:
            result = MultiExecBitmapIndexScan((BitmapIndexScanState *) node);
            break;

        case T_BitmapAndState:
            result = MultiExecBitmapAnd((BitmapAndState *) node);
            break;

        case T_BitmapOrState:
            result = MultiExecBitmapOr((BitmapOrState *) node);
            break;

        default:
            elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node));
            result = NULL;
            break;
    }

    return result;
}