nodeValuesscan.h File Reference

#include "nodes/execnodes.h"

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Functions
ValuesScanState *	ExecInitValuesScan (ValuesScan *node, EState *estate, int eflags)
void	ExecReScanValuesScan (ValuesScanState *node)

Function Documentation

ExecInitValuesScan()

ValuesScanState * ExecInitValuesScan ( ValuesScan *  node, EState *  estate, int  eflags  )

extern

Definition at line 210 of file nodeValuesscan.c.

{
    ValuesScanState *scanstate;
    TupleDesc   tupdesc;
    ListCell   *vtl;
    int         i;
    PlanState  *planstate;
 
    /*
     * ValuesScan should not have any children.
     */
    Assert(outerPlan(node) == NULL);
    Assert(innerPlan(node) == NULL);
 
    /*
     * create new ScanState for node
     */
    scanstate = makeNode(ValuesScanState);
    scanstate->ss.ps.plan = (Plan *) node;
    scanstate->ss.ps.state = estate;
    scanstate->ss.ps.ExecProcNode = ExecValuesScan;
 
    /*
     * Miscellaneous initialization
     */
    planstate = &scanstate->ss.ps;
 
    /*
     * Create expression contexts.  We need two, one for per-sublist
     * processing and one for execScan.c to use for quals and projections. We
     * cheat a little by using ExecAssignExprContext() to build both.
     */
    ExecAssignExprContext(estate, planstate);
    scanstate->rowcontext = planstate->ps_ExprContext;
    ExecAssignExprContext(estate, planstate);
 
    /*
     * Get info about values list, initialize scan slot with it.
     */
    tupdesc = ExecTypeFromExprList((List *) linitial(node->values_lists));
    ExecInitScanTupleSlot(estate, &scanstate->ss, tupdesc, &TTSOpsVirtual);
 
    /*
     * Initialize result type and projection.
     */
    ExecInitResultTypeTL(&scanstate->ss.ps);
    ExecAssignScanProjectionInfo(&scanstate->ss);
 
    /*
     * initialize child expressions
     */
    scanstate->ss.ps.qual =
        ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
 
    /*
     * Other node-specific setup
     */
    scanstate->curr_idx = -1;
    scanstate->array_len = list_length(node->values_lists);
 
    /*
     * Convert the list of expression sublists into an array for easier
     * addressing at runtime.  Also, detect whether any sublists contain
     * SubPlans; for just those sublists, go ahead and do expression
     * initialization.  (This avoids problems with SubPlans wanting to connect
     * themselves up to the outer plan tree.  Notably, EXPLAIN won't see the
     * subplans otherwise; also we will have troubles with dangling pointers
     * and/or leaked resources if we try to handle SubPlans the same as
     * simpler expressions.)
     */
    scanstate->exprlists = (List **)
        palloc(scanstate->array_len * sizeof(List *));
    scanstate->exprstatelists = (List **)
        palloc0(scanstate->array_len * sizeof(List *));
    i = 0;
    foreach(vtl, node->values_lists)
    {
        List       *exprs = lfirst_node(List, vtl);
 
        scanstate->exprlists[i] = exprs;
 
        /*
         * We can avoid the cost of a contain_subplans() scan in the simple
         * case where there are no SubPlans anywhere.
         */
        if (estate->es_subplanstates &&
            contain_subplans((Node *) exprs))
        {
            int         saved_jit_flags;
 
            /*
             * As these expressions are only used once, disable JIT for them.
             * This is worthwhile because it's common to insert significant
             * amounts of data via VALUES().  Note that this doesn't prevent
             * use of JIT *within* a subplan, since that's initialized
             * separately; this just affects the upper-level subexpressions.
             */
            saved_jit_flags = estate->es_jit_flags;
            estate->es_jit_flags = PGJIT_NONE;
 
            scanstate->exprstatelists[i] = ExecInitExprList(exprs,
                                                            &scanstate->ss.ps);
 
            estate->es_jit_flags = saved_jit_flags;
        }
        i++;
    }
 
    return scanstate;
}

References Assert, contain_subplans(), EState::es_jit_flags, EState::es_subplanstates, ExecAssignExprContext(), ExecAssignScanProjectionInfo(), ExecInitExprList(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), ExecTypeFromExprList(), ExecValuesScan(), fb(), i, innerPlan, lfirst_node, linitial, list_length(), makeNode, outerPlan, palloc(), palloc0(), PGJIT_NONE, PlanState::ps_ExprContext, ValuesScan::scan, TTSOpsVirtual, and ValuesScan::values_lists.

Referenced by ExecInitNode().

ExecReScanValuesScan()

void ExecReScanValuesScan ( ValuesScanState *  node )

extern

Definition at line 328 of file nodeValuesscan.c.

{
    if (node->ss.ps.ps_ResultTupleSlot)
        ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
 
    ExecScanReScan(&node->ss);
 
    node->curr_idx = -1;
}

References ValuesScanState::curr_idx, ExecClearTuple(), ExecScanReScan(), ScanState::ps, PlanState::ps_ResultTupleSlot, and ValuesScanState::ss.

Referenced by ExecReScan().