nodeTidscan.h File Reference

#include "nodes/execnodes.h"

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Functions
TidScanState *	ExecInitTidScan (TidScan *node, EState *estate, int eflags)
void	ExecEndTidScan (TidScanState *node)
void	ExecReScanTidScan (TidScanState *node)

Function Documentation

ExecEndTidScan()

void ExecEndTidScan

(

TidScanState *

node

)

Definition at line 471 of file nodeTidscan.c.

{
    if (node->ss.ss_currentScanDesc)
        table_endscan(node->ss.ss_currentScanDesc);
 
    /*
     * Free the exprcontext
     */
    ExecFreeExprContext(&node->ss.ps);
 
    /*
     * clear out tuple table slots
     */
    if (node->ss.ps.ps_ResultTupleSlot)
        ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
    ExecClearTuple(node->ss.ss_ScanTupleSlot);
}

References ExecClearTuple(), ExecFreeExprContext(), ScanState::ps, PlanState::ps_ResultTupleSlot, TidScanState::ss, ScanState::ss_currentScanDesc, ScanState::ss_ScanTupleSlot, and table_endscan().

Referenced by ExecEndNode().

ExecInitTidScan()

TidScanState* ExecInitTidScan	(	TidScan *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 501 of file nodeTidscan.c.

{
    TidScanState *tidstate;
    Relation    currentRelation;
 
    /*
     * create state structure
     */
    tidstate = makeNode(TidScanState);
    tidstate->ss.ps.plan = (Plan *) node;
    tidstate->ss.ps.state = estate;
    tidstate->ss.ps.ExecProcNode = ExecTidScan;
 
    /*
     * Miscellaneous initialization
     *
     * create expression context for node
     */
    ExecAssignExprContext(estate, &tidstate->ss.ps);
 
    /*
     * mark tid list as not computed yet
     */
    tidstate->tss_TidList = NULL;
    tidstate->tss_NumTids = 0;
    tidstate->tss_TidPtr = -1;
 
    /*
     * open the scan relation
     */
    currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);
 
    tidstate->ss.ss_currentRelation = currentRelation;
    tidstate->ss.ss_currentScanDesc = NULL; /* no heap scan here */
 
    /*
     * get the scan type from the relation descriptor.
     */
    ExecInitScanTupleSlot(estate, &tidstate->ss,
                          RelationGetDescr(currentRelation),
                          table_slot_callbacks(currentRelation));
 
    /*
     * Initialize result type and projection.
     */
    ExecInitResultTypeTL(&tidstate->ss.ps);
    ExecAssignScanProjectionInfo(&tidstate->ss);
 
    /*
     * initialize child expressions
     */
    tidstate->ss.ps.qual =
        ExecInitQual(node->scan.plan.qual, (PlanState *) tidstate);
 
    TidExprListCreate(tidstate);
 
    /*
     * all done.
     */
    return tidstate;
}

References ExecAssignExprContext(), ExecAssignScanProjectionInfo(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), ExecOpenScanRelation(), PlanState::ExecProcNode, ExecTidScan(), makeNode, PlanState::plan, ScanState::ps, PlanState::qual, RelationGetDescr, TidScan::scan, Scan::scanrelid, TidScanState::ss, ScanState::ss_currentRelation, ScanState::ss_currentScanDesc, PlanState::state, table_slot_callbacks(), TidExprListCreate(), TidScanState::tss_NumTids, TidScanState::tss_TidList, and TidScanState::tss_TidPtr.

Referenced by ExecInitNode().

ExecReScanTidScan()

void ExecReScanTidScan

(

TidScanState *

node

)

Definition at line 448 of file nodeTidscan.c.

{
    if (node->tss_TidList)
        pfree(node->tss_TidList);
    node->tss_TidList = NULL;
    node->tss_NumTids = 0;
    node->tss_TidPtr = -1;
 
    /* not really necessary, but seems good form */
    if (node->ss.ss_currentScanDesc)
        table_rescan(node->ss.ss_currentScanDesc, NULL);
 
    ExecScanReScan(&node->ss);
}

References ExecScanReScan(), pfree(), TidScanState::ss, ScanState::ss_currentScanDesc, table_rescan(), TidScanState::tss_NumTids, TidScanState::tss_TidList, and TidScanState::tss_TidPtr.

Referenced by ExecReScan().