nodeWorktablescan.h File Reference

#include "nodes/execnodes.h"

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Functions
WorkTableScanState *	ExecInitWorkTableScan (WorkTableScan *node, EState *estate, int eflags)
void	ExecReScanWorkTableScan (WorkTableScanState *node)

Function Documentation

ExecInitWorkTableScan()

WorkTableScanState * ExecInitWorkTableScan ( WorkTableScan *  node, EState *  estate, int  eflags  )

extern

Definition at line 131 of file nodeWorktablescan.c.

{
    WorkTableScanState *scanstate;
 
    /* check for unsupported flags */
    Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
 
    /*
     * WorkTableScan should not have any children.
     */
    Assert(outerPlan(node) == NULL);
    Assert(innerPlan(node) == NULL);
 
    /*
     * create new WorkTableScanState for node
     */
    scanstate = makeNode(WorkTableScanState);
    scanstate->ss.ps.plan = (Plan *) node;
    scanstate->ss.ps.state = estate;
    scanstate->ss.ps.ExecProcNode = ExecWorkTableScan;
    scanstate->rustate = NULL;  /* we'll set this later */
 
    /*
     * Miscellaneous initialization
     *
     * create expression context for node
     */
    ExecAssignExprContext(estate, &scanstate->ss.ps);
 
    /*
     * tuple table initialization
     */
    ExecInitResultTypeTL(&scanstate->ss.ps);
 
    /* signal that return type is not yet known */
    scanstate->ss.ps.resultopsset = true;
    scanstate->ss.ps.resultopsfixed = false;
 
    ExecInitScanTupleSlot(estate, &scanstate->ss, NULL, &TTSOpsMinimalTuple, 0);
 
    /*
     * initialize child expressions
     */
    scanstate->ss.ps.qual =
        ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
 
    /*
     * Do not yet initialize projection info, see ExecWorkTableScan() for
     * details.
     */
 
    return scanstate;
}

References Assert, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), ExecWorkTableScan(), fb(), innerPlan, makeNode, outerPlan, WorkTableScan::scan, and TTSOpsMinimalTuple.

Referenced by ExecInitNode().

ExecReScanWorkTableScan()

void ExecReScanWorkTableScan ( WorkTableScanState *  node )

extern

Definition at line 192 of file nodeWorktablescan.c.

{
    if (node->ss.ps.ps_ResultTupleSlot)
        ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
 
    ExecScanReScan(&node->ss);
 
    /* No need (or way) to rescan if ExecWorkTableScan not called yet */
    if (node->rustate)
        tuplestore_rescan(node->rustate->working_table);
}

References ExecClearTuple(), ExecScanReScan(), ScanState::ps, PlanState::ps_ResultTupleSlot, WorkTableScanState::rustate, WorkTableScanState::ss, tuplestore_rescan(), and RecursiveUnionState::working_table.

Referenced by ExecReScan().