execScan.c File Reference

#include "postgres.h"
#include "executor/executor.h"
#include "executor/execScan.h"
#include "miscadmin.h"

Include dependency graph for execScan.c:

Go to the source code of this file.

Functions
TupleTableSlot *	ExecScan (ScanState *node, ExecScanAccessMtd accessMtd, ExecScanRecheckMtd recheckMtd)
void	ExecAssignScanProjectionInfo (ScanState *node)
void	ExecAssignScanProjectionInfoWithVarno (ScanState *node, int varno)
void	ExecScanReScan (ScanState *node)

Function Documentation

ExecAssignScanProjectionInfo()

void ExecAssignScanProjectionInfo

(

ScanState *

node

)

Definition at line 81 of file execScan.c.

{
    Scan       *scan = (Scan *) node->ps.plan;
    TupleDesc   tupdesc = node->ss_ScanTupleSlot->tts_tupleDescriptor;
 
    ExecConditionalAssignProjectionInfo(&node->ps, tupdesc, scan->scanrelid);
}

References ExecConditionalAssignProjectionInfo(), PlanState::plan, ScanState::ps, Scan::scanrelid, ScanState::ss_ScanTupleSlot, and TupleTableSlot::tts_tupleDescriptor.

Referenced by ExecInitBitmapHeapScan(), ExecInitCteScan(), ExecInitFunctionScan(), ExecInitIndexScan(), ExecInitNamedTuplestoreScan(), ExecInitSampleScan(), ExecInitSeqScan(), ExecInitSubqueryScan(), ExecInitTableFuncScan(), ExecInitTidRangeScan(), ExecInitTidScan(), ExecInitValuesScan(), and ExecWorkTableScan().

ExecAssignScanProjectionInfoWithVarno()

void ExecAssignScanProjectionInfoWithVarno	(	ScanState *	node,
		int	varno
	)

Definition at line 94 of file execScan.c.

{
    TupleDesc   tupdesc = node->ss_ScanTupleSlot->tts_tupleDescriptor;
 
    ExecConditionalAssignProjectionInfo(&node->ps, tupdesc, varno);
}

References ExecConditionalAssignProjectionInfo(), ScanState::ps, ScanState::ss_ScanTupleSlot, and TupleTableSlot::tts_tupleDescriptor.

Referenced by ExecInitCustomScan(), ExecInitForeignScan(), and ExecInitIndexOnlyScan().

ExecScan()

TupleTableSlot * ExecScan	(	ScanState *	node,
		ExecScanAccessMtd	accessMtd,
		ExecScanRecheckMtd	recheckMtd
	)

Definition at line 47 of file execScan.c.

{
    EPQState   *epqstate;
    ExprState  *qual;
    ProjectionInfo *projInfo;
 
    epqstate = node->ps.state->es_epq_active;
    qual = node->ps.qual;
    projInfo = node->ps.ps_ProjInfo;
 
    return ExecScanExtended(node,
                            accessMtd,
                            recheckMtd,
                            epqstate,
                            qual,
                            projInfo);
}

References EState::es_epq_active, ExecScanExtended(), ScanState::ps, PlanState::ps_ProjInfo, PlanState::qual, and PlanState::state.

Referenced by ExecBitmapHeapScan(), ExecCteScan(), ExecForeignScan(), ExecFunctionScan(), ExecIndexOnlyScan(), ExecIndexScan(), ExecNamedTuplestoreScan(), ExecSampleScan(), ExecSeqScanEPQ(), ExecSubqueryScan(), ExecTableFuncScan(), ExecTidRangeScan(), ExecTidScan(), ExecValuesScan(), and ExecWorkTableScan().

ExecScanReScan()

void ExecScanReScan

(

ScanState *

node

)

Definition at line 108 of file execScan.c.

{
    EState     *estate = node->ps.state;
 
    /*
     * We must clear the scan tuple so that observers (e.g., execCurrent.c)
     * can tell that this plan node is not positioned on a tuple.
     */
    ExecClearTuple(node->ss_ScanTupleSlot);
 
    /*
     * Rescan EvalPlanQual tuple(s) if we're inside an EvalPlanQual recheck.
     * But don't lose the "blocked" status of blocked target relations.
     */
    if (estate->es_epq_active != NULL)
    {
        EPQState   *epqstate = estate->es_epq_active;
        Index       scanrelid = ((Scan *) node->ps.plan)->scanrelid;
 
        if (scanrelid > 0)
            epqstate->relsubs_done[scanrelid - 1] =
                epqstate->relsubs_blocked[scanrelid - 1];
        else
        {
            Bitmapset  *relids;
            int         rtindex = -1;
 
            /*
             * If an FDW or custom scan provider has replaced the join with a
             * scan, there are multiple RTIs; reset the epqScanDone flag for
             * all of them.
             */
            if (IsA(node->ps.plan, ForeignScan))
                relids = ((ForeignScan *) node->ps.plan)->fs_base_relids;
            else if (IsA(node->ps.plan, CustomScan))
                relids = ((CustomScan *) node->ps.plan)->custom_relids;
            else
                elog(ERROR, "unexpected scan node: %d",
                     (int) nodeTag(node->ps.plan));
 
            while ((rtindex = bms_next_member(relids, rtindex)) >= 0)
            {
                Assert(rtindex > 0);
                epqstate->relsubs_done[rtindex - 1] =
                    epqstate->relsubs_blocked[rtindex - 1];
            }
        }
    }
}

References Assert(), bms_next_member(), elog, ERROR, EState::es_epq_active, ExecClearTuple(), IsA, nodeTag, PlanState::plan, ScanState::ps, EPQState::relsubs_blocked, EPQState::relsubs_done, ScanState::ss_ScanTupleSlot, and PlanState::state.

Referenced by ExecReScanBitmapHeapScan(), ExecReScanCteScan(), ExecReScanForeignScan(), ExecReScanFunctionScan(), ExecReScanIndexOnlyScan(), ExecReScanIndexScan(), ExecReScanNamedTuplestoreScan(), ExecReScanSampleScan(), ExecReScanSeqScan(), ExecReScanSubqueryScan(), ExecReScanTableFuncScan(), ExecReScanTidRangeScan(), ExecReScanTidScan(), ExecReScanValuesScan(), and ExecReScanWorkTableScan().