nodeResult.h File Reference

#include "nodes/execnodes.h"

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Functions
ResultState *	ExecInitResult (Result *node, EState *estate, int eflags)
void	ExecEndResult (ResultState *node)
void	ExecResultMarkPos (ResultState *node)
void	ExecResultRestrPos (ResultState *node)
void	ExecReScanResult (ResultState *node)

Function Documentation

ExecEndResult()

void ExecEndResult

(

ResultState *

node

)

Definition at line 241 of file nodeResult.c.

{
    /*
     * Free the exprcontext
     */
    ExecFreeExprContext(&node->ps);
 
    /*
     * clean out the tuple table
     */
    ExecClearTuple(node->ps.ps_ResultTupleSlot);
 
    /*
     * shut down subplans
     */
    ExecEndNode(outerPlanState(node));
}

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

Referenced by ExecEndNode().

ExecInitResult()

ResultState* ExecInitResult	(	Result *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 181 of file nodeResult.c.

{
    ResultState *resstate;
 
    /* check for unsupported flags */
    Assert(!(eflags & (EXEC_FLAG_MARK | EXEC_FLAG_BACKWARD)) ||
           outerPlan(node) != NULL);
 
    /*
     * create state structure
     */
    resstate = makeNode(ResultState);
    resstate->ps.plan = (Plan *) node;
    resstate->ps.state = estate;
    resstate->ps.ExecProcNode = ExecResult;
 
    resstate->rs_done = false;
    resstate->rs_checkqual = (node->resconstantqual != NULL);
 
    /*
     * Miscellaneous initialization
     *
     * create expression context for node
     */
    ExecAssignExprContext(estate, &resstate->ps);
 
    /*
     * initialize child nodes
     */
    outerPlanState(resstate) = ExecInitNode(outerPlan(node), estate, eflags);
 
    /*
     * we don't use inner plan
     */
    Assert(innerPlan(node) == NULL);
 
    /*
     * Initialize result slot, type and projection.
     */
    ExecInitResultTupleSlotTL(&resstate->ps, &TTSOpsVirtual);
    ExecAssignProjectionInfo(&resstate->ps, NULL);
 
    /*
     * initialize child expressions
     */
    resstate->ps.qual =
        ExecInitQual(node->plan.qual, (PlanState *) resstate);
    resstate->resconstantqual =
        ExecInitQual((List *) node->resconstantqual, (PlanState *) resstate);
 
    return resstate;
}

References Assert(), EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecAssignProjectionInfo(), ExecInitNode(), ExecInitQual(), ExecInitResultTupleSlotTL(), PlanState::ExecProcNode, ExecResult(), innerPlan, makeNode, outerPlan, outerPlanState, PlanState::plan, Result::plan, ResultState::ps, PlanState::qual, Plan::qual, ResultState::resconstantqual, Result::resconstantqual, ResultState::rs_checkqual, ResultState::rs_done, PlanState::state, and TTSOpsVirtual.

Referenced by ExecInitNode().

ExecReScanResult()

void ExecReScanResult

(

ResultState *

node

)

Definition at line 260 of file nodeResult.c.

{
    PlanState  *outerPlan = outerPlanState(node);
 
    node->rs_done = false;
    node->rs_checkqual = (node->resconstantqual != NULL);
 
    /*
     * If chgParam of subnode is not null then plan will be re-scanned by
     * first ExecProcNode.
     */
    if (outerPlan && outerPlan->chgParam == NULL)
        ExecReScan(outerPlan);
}

References ExecReScan(), outerPlan, outerPlanState, ResultState::resconstantqual, ResultState::rs_checkqual, and ResultState::rs_done.

Referenced by ExecReScan().

ExecResultMarkPos()

void ExecResultMarkPos

(

ResultState *

node

)

Definition at line 147 of file nodeResult.c.

{
    PlanState  *outerPlan = outerPlanState(node);
 
    if (outerPlan != NULL)
        ExecMarkPos(outerPlan);
    else
        elog(DEBUG2, "Result nodes do not support mark/restore");
}

References DEBUG2, elog(), ExecMarkPos(), outerPlan, and outerPlanState.

Referenced by ExecMarkPos().

ExecResultRestrPos()

void ExecResultRestrPos

(

ResultState *

node

)

Definition at line 162 of file nodeResult.c.

{
    PlanState  *outerPlan = outerPlanState(node);
 
    if (outerPlan != NULL)
        ExecRestrPos(outerPlan);
    else
        elog(ERROR, "Result nodes do not support mark/restore");
}

References elog(), ERROR, ExecRestrPos(), outerPlan, and outerPlanState.

Referenced by ExecRestrPos().