nodeGroup.h File Reference

#include "nodes/execnodes.h"

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Functions
GroupState *	ExecInitGroup (Group *node, EState *estate, int eflags)
void	ExecEndGroup (GroupState *node)
void	ExecReScanGroup (GroupState *node)

Function Documentation

ExecEndGroup()

void ExecEndGroup

(

GroupState *

node

)

Definition at line 227 of file nodeGroup.c.

{
    PlanState  *outerPlan;
 
    ExecFreeExprContext(&node->ss.ps);
 
    /* clean up tuple table */
    ExecClearTuple(node->ss.ss_ScanTupleSlot);
 
    outerPlan = outerPlanState(node);
    ExecEndNode(outerPlan);
}

References ExecClearTuple(), ExecEndNode(), ExecFreeExprContext(), outerPlan, outerPlanState, ScanState::ps, GroupState::ss, and ScanState::ss_ScanTupleSlot.

Referenced by ExecEndNode().

ExecInitGroup()

GroupState* ExecInitGroup	(	Group *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 162 of file nodeGroup.c.

{
    GroupState *grpstate;
    const TupleTableSlotOps *tts_ops;
 
    /* check for unsupported flags */
    Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
 
    /*
     * create state structure
     */
    grpstate = makeNode(GroupState);
    grpstate->ss.ps.plan = (Plan *) node;
    grpstate->ss.ps.state = estate;
    grpstate->ss.ps.ExecProcNode = ExecGroup;
    grpstate->grp_done = false;
 
    /*
     * create expression context
     */
    ExecAssignExprContext(estate, &grpstate->ss.ps);
 
    /*
     * initialize child nodes
     */
    outerPlanState(grpstate) = ExecInitNode(outerPlan(node), estate, eflags);
 
    /*
     * Initialize scan slot and type.
     */
    tts_ops = ExecGetResultSlotOps(outerPlanState(&grpstate->ss), NULL);
    ExecCreateScanSlotFromOuterPlan(estate, &grpstate->ss, tts_ops);
 
    /*
     * Initialize result slot, type and projection.
     */
    ExecInitResultTupleSlotTL(&grpstate->ss.ps, &TTSOpsVirtual);
    ExecAssignProjectionInfo(&grpstate->ss.ps, NULL);
 
    /*
     * initialize child expressions
     */
    grpstate->ss.ps.qual =
        ExecInitQual(node->plan.qual, (PlanState *) grpstate);
 
    /*
     * Precompute fmgr lookup data for inner loop
     */
    grpstate->eqfunction =
        execTuplesMatchPrepare(ExecGetResultType(outerPlanState(grpstate)),
                               node->numCols,
                               node->grpColIdx,
                               node->grpOperators,
                               node->grpCollations,
                               &grpstate->ss.ps);
 
    return grpstate;
}

References Assert(), GroupState::eqfunction, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecAssignProjectionInfo(), ExecCreateScanSlotFromOuterPlan(), ExecGetResultSlotOps(), ExecGetResultType(), ExecGroup(), ExecInitNode(), ExecInitQual(), ExecInitResultTupleSlotTL(), PlanState::ExecProcNode, execTuplesMatchPrepare(), GroupState::grp_done, makeNode, Group::numCols, outerPlan, outerPlanState, PlanState::plan, Group::plan, ScanState::ps, PlanState::qual, Plan::qual, GroupState::ss, PlanState::state, and TTSOpsVirtual.

Referenced by ExecInitNode().

ExecReScanGroup()

void ExecReScanGroup

(

GroupState *

node

)

Definition at line 241 of file nodeGroup.c.

{
    PlanState  *outerPlan = outerPlanState(node);
 
    node->grp_done = false;
    /* must clear first tuple */
    ExecClearTuple(node->ss.ss_ScanTupleSlot);
 
    /*
     * if chgParam of subnode is not null then plan will be re-scanned by
     * first ExecProcNode.
     */
    if (outerPlan->chgParam == NULL)
        ExecReScan(outerPlan);
}

References ExecClearTuple(), ExecReScan(), GroupState::grp_done, outerPlan, outerPlanState, GroupState::ss, and ScanState::ss_ScanTupleSlot.

Referenced by ExecReScan().