nodeUnique.h File Reference

#include "nodes/execnodes.h"

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Functions
UniqueState *	ExecInitUnique (Unique *node, EState *estate, int eflags)
void	ExecEndUnique (UniqueState *node)
void	ExecReScanUnique (UniqueState *node)

Function Documentation

ExecEndUnique()

void ExecEndUnique

(

UniqueState *

node

)

Definition at line 169 of file nodeUnique.c.

{
    /* clean up tuple table */
    ExecClearTuple(node->ps.ps_ResultTupleSlot);
 
    ExecFreeExprContext(&node->ps);
 
    ExecEndNode(outerPlanState(node));
}

References ExecClearTuple(), ExecEndNode(), ExecFreeExprContext(), outerPlanState, UniqueState::ps, and PlanState::ps_ResultTupleSlot.

Referenced by ExecEndNode().

ExecInitUnique()

UniqueState* ExecInitUnique	(	Unique *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 115 of file nodeUnique.c.

{
    UniqueState *uniquestate;
 
    /* check for unsupported flags */
    Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
 
    /*
     * create state structure
     */
    uniquestate = makeNode(UniqueState);
    uniquestate->ps.plan = (Plan *) node;
    uniquestate->ps.state = estate;
    uniquestate->ps.ExecProcNode = ExecUnique;
 
    /*
     * create expression context
     */
    ExecAssignExprContext(estate, &uniquestate->ps);
 
    /*
     * then initialize outer plan
     */
    outerPlanState(uniquestate) = ExecInitNode(outerPlan(node), estate, eflags);
 
    /*
     * Initialize result slot and type. Unique nodes do no projections, so
     * initialize projection info for this node appropriately.
     */
    ExecInitResultTupleSlotTL(&uniquestate->ps, &TTSOpsMinimalTuple);
    uniquestate->ps.ps_ProjInfo = NULL;
 
    /*
     * Precompute fmgr lookup data for inner loop
     */
    uniquestate->eqfunction =
        execTuplesMatchPrepare(ExecGetResultType(outerPlanState(uniquestate)),
                               node->numCols,
                               node->uniqColIdx,
                               node->uniqOperators,
                               node->uniqCollations,
                               &uniquestate->ps);
 
    return uniquestate;
}

References Assert(), UniqueState::eqfunction, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecGetResultType(), ExecInitNode(), ExecInitResultTupleSlotTL(), PlanState::ExecProcNode, execTuplesMatchPrepare(), ExecUnique(), makeNode, Unique::numCols, outerPlan, outerPlanState, PlanState::plan, UniqueState::ps, PlanState::ps_ProjInfo, PlanState::state, and TTSOpsMinimalTuple.

Referenced by ExecInitNode().

ExecReScanUnique()

void ExecReScanUnique

(

UniqueState *

node

)

Definition at line 181 of file nodeUnique.c.

{
    PlanState  *outerPlan = outerPlanState(node);
 
    /* must clear result tuple so first input tuple is returned */
    ExecClearTuple(node->ps.ps_ResultTupleSlot);
 
    /*
     * 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(), outerPlan, outerPlanState, UniqueState::ps, and PlanState::ps_ResultTupleSlot.

Referenced by ExecReScan().