nodeTidrangescan.h File Reference

#include "nodes/execnodes.h"

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Functions
TidRangeScanState *	ExecInitTidRangeScan (TidRangeScan *node, EState *estate, int eflags)
void	ExecEndTidRangeScan (TidRangeScanState *node)
void	ExecReScanTidRangeScan (TidRangeScanState *node)

Function Documentation

ExecEndTidRangeScan()

void ExecEndTidRangeScan

(

TidRangeScanState *

node

)

Definition at line 328 of file nodeTidrangescan.c.

{
    TableScanDesc scan = node->ss.ss_currentScanDesc;
 
    if (scan != NULL)
        table_endscan(scan);
 
    /*
     * 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, TidRangeScanState::ss, ScanState::ss_currentScanDesc, ScanState::ss_ScanTupleSlot, and table_endscan().

Referenced by ExecEndNode().

ExecInitTidRangeScan()

TidRangeScanState* ExecInitTidRangeScan	(	TidRangeScan *	node,
		EState *	estate,
		int	eflags
	)

Definition at line 360 of file nodeTidrangescan.c.

{
    TidRangeScanState *tidrangestate;
    Relation    currentRelation;
 
    /*
     * create state structure
     */
    tidrangestate = makeNode(TidRangeScanState);
    tidrangestate->ss.ps.plan = (Plan *) node;
    tidrangestate->ss.ps.state = estate;
    tidrangestate->ss.ps.ExecProcNode = ExecTidRangeScan;
 
    /*
     * Miscellaneous initialization
     *
     * create expression context for node
     */
    ExecAssignExprContext(estate, &tidrangestate->ss.ps);
 
    /*
     * mark scan as not in progress, and TID range as not computed yet
     */
    tidrangestate->trss_inScan = false;
 
    /*
     * open the scan relation
     */
    currentRelation = ExecOpenScanRelation(estate, node->scan.scanrelid, eflags);
 
    tidrangestate->ss.ss_currentRelation = currentRelation;
    tidrangestate->ss.ss_currentScanDesc = NULL;    /* no table scan here */
 
    /*
     * get the scan type from the relation descriptor.
     */
    ExecInitScanTupleSlot(estate, &tidrangestate->ss,
                          RelationGetDescr(currentRelation),
                          table_slot_callbacks(currentRelation));
 
    /*
     * Initialize result type and projection.
     */
    ExecInitResultTypeTL(&tidrangestate->ss.ps);
    ExecAssignScanProjectionInfo(&tidrangestate->ss);
 
    /*
     * initialize child expressions
     */
    tidrangestate->ss.ps.qual =
        ExecInitQual(node->scan.plan.qual, (PlanState *) tidrangestate);
 
    TidExprListCreate(tidrangestate);
 
    /*
     * all done.
     */
    return tidrangestate;
}

References ExecAssignExprContext(), ExecAssignScanProjectionInfo(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), ExecOpenScanRelation(), PlanState::ExecProcNode, ExecTidRangeScan(), makeNode, PlanState::plan, ScanState::ps, PlanState::qual, RelationGetDescr, TidRangeScan::scan, Scan::scanrelid, TidRangeScanState::ss, ScanState::ss_currentRelation, ScanState::ss_currentScanDesc, PlanState::state, table_slot_callbacks(), TidExprListCreate(), and TidRangeScanState::trss_inScan.

Referenced by ExecInitNode().

ExecReScanTidRangeScan()

void ExecReScanTidRangeScan

(

TidRangeScanState *

node

)

Definition at line 309 of file nodeTidrangescan.c.

{
    /* mark scan as not in progress, and tid range list as not computed yet */
    node->trss_inScan = false;
 
    /*
     * We must wait until TidRangeNext before calling table_rescan_tidrange.
     */
    ExecScanReScan(&node->ss);
}

References ExecScanReScan(), TidRangeScanState::ss, and TidRangeScanState::trss_inScan.

Referenced by ExecReScan().