PostgreSQL Source Code git master
Functions
nodeNamedtuplestorescan.c File Reference
#include "postgres.h"
#include "executor/executor.h"
#include "executor/nodeNamedtuplestorescan.h"
#include "utils/queryenvironment.h"
Include dependency graph for nodeNamedtuplestorescan.c:

Go to the source code of this file.

Functions

static TupleTableSlot *  NamedTuplestoreScanNext (NamedTuplestoreScanState *node)
 
static bool  NamedTuplestoreScanRecheck (NamedTuplestoreScanState *node, TupleTableSlot *slot)
 
static TupleTableSlot *  ExecNamedTuplestoreScan (PlanState *pstate)
 
NamedTuplestoreScanState *  ExecInitNamedTuplestoreScan (NamedTuplestoreScan *node, EState *estate, int eflags)
 
void  ExecReScanNamedTuplestoreScan (NamedTuplestoreScanState *node)
 

Function Documentation

◆ ExecInitNamedTuplestoreScan()

NamedTuplestoreScanState * ExecInitNamedTuplestoreScan ( NamedTuplestoreScan *  node,
EState *  estate,
int  eflags 
)

Definition at line 82 of file nodeNamedtuplestorescan.c.

83{
84 NamedTuplestoreScanState *scanstate;
86
87 /* check for unsupported flags */
89
90 /*
91 * NamedTuplestoreScan should not have any children.
92 */
93 Assert(outerPlan(node) == NULL);
94 Assert(innerPlan(node) == NULL);
95
96 /*
97 * create new NamedTuplestoreScanState for node
98 */
100 scanstate->ss.ps.plan = (Plan *) node;
101 scanstate->ss.ps.state = estate;
103
104 enr = get_ENR(estate->es_queryEnv, node->enrname);
105 if (!enr)
106 elog(ERROR, "executor could not find named tuplestore \"%s\"",
107 node->enrname);
108
109 Assert(enr->reldata);
110 scanstate->relation = (Tuplestorestate *) enr->reldata;
111 scanstate->tupdesc = ENRMetadataGetTupDesc(&(enr->md));
112 scanstate->readptr =
114
115 /*
116 * The new read pointer copies its position from read pointer 0, which
117 * could be anywhere, so explicitly rewind it.
118 */
119 tuplestore_select_read_pointer(scanstate->relation, scanstate->readptr);
120 tuplestore_rescan(scanstate->relation);
121
122 /*
123 * XXX: Should we add a function to free that read pointer when done?
124 *
125 * This was attempted, but it did not improve performance or memory usage
126 * in any tested cases.
127 */
128
129 /*
130 * Miscellaneous initialization
131 *
132 * create expression context for node
133 */
134 ExecAssignExprContext(estate, &scanstate->ss.ps);
135
136 /*
137 * The scan tuple type is specified for the tuplestore.
138 */
139 ExecInitScanTupleSlot(estate, &scanstate->ss, scanstate->tupdesc,
141
142 /*
143 * Initialize result type and projection.
144 */
145 ExecInitResultTypeTL(&scanstate->ss.ps);
146 ExecAssignScanProjectionInfo(&scanstate->ss);
147
148 /*
149 * initialize child expressions
150 */
151 scanstate->ss.ps.qual =
152 ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
153
154 return scanstate;
155}
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226
ExprState * ExecInitQual(List *qual, PlanState *parent)
Definition: execExpr.c:229
void ExecAssignScanProjectionInfo(ScanState *node)
Definition: execScan.c:81
void ExecInitScanTupleSlot(EState *estate, ScanState *scanstate, TupleDesc tupledesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:2000
void ExecInitResultTypeTL(PlanState *planstate)
Definition: execTuples.c:1944
const TupleTableSlotOps TTSOpsMinimalTuple
Definition: execTuples.c:86
void ExecAssignExprContext(EState *estate, PlanState *planstate)
Definition: execUtils.c:485
#define EXEC_FLAG_BACKWARD
Definition: executor.h:69
#define EXEC_FLAG_REWIND
Definition: executor.h:68
#define EXEC_FLAG_MARK
Definition: executor.h:70
Assert(PointerIsAligned(start, uint64))
static TupleTableSlot * ExecNamedTuplestoreScan(PlanState *pstate)
#define makeNode(_type_)
Definition: nodes.h:161
#define innerPlan(node)
Definition: plannodes.h:251
#define outerPlan(node)
Definition: plannodes.h:252
TupleDesc ENRMetadataGetTupDesc(EphemeralNamedRelationMetadata enrmd)
EphemeralNamedRelation get_ENR(QueryEnvironment *queryEnv, const char *name)
QueryEnvironment * es_queryEnv
Definition: execnodes.h:707
EphemeralNamedRelationMetadataData md
Tuplestorestate * relation
Definition: execnodes.h:2080
ExprState * qual
Definition: execnodes.h:1180
Plan * plan
Definition: execnodes.h:1159
EState * state
Definition: execnodes.h:1161
ExecProcNodeMtd ExecProcNode
Definition: execnodes.h:1165
Definition: plannodes.h:177
PlanState ps
Definition: execnodes.h:1615
void tuplestore_select_read_pointer(Tuplestorestate *state, int ptr)
Definition: tuplestore.c:507
void tuplestore_rescan(Tuplestorestate *state)
Definition: tuplestore.c:1285
int tuplestore_alloc_read_pointer(Tuplestorestate *state, int eflags)
Definition: tuplestore.c:395

References Assert(), elog, ENRMetadataGetTupDesc(), NamedTuplestoreScan::enrname, ERROR, EState::es_queryEnv, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, EXEC_FLAG_REWIND, ExecAssignExprContext(), ExecAssignScanProjectionInfo(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), ExecNamedTuplestoreScan(), PlanState::ExecProcNode, get_ENR(), innerPlan, makeNode, EphemeralNamedRelationData::md, outerPlan, PlanState::plan, ScanState::ps, PlanState::qual, NamedTuplestoreScanState::readptr, NamedTuplestoreScanState::relation, EphemeralNamedRelationData::reldata, NamedTuplestoreScan::scan, NamedTuplestoreScanState::ss, PlanState::state, TTSOpsMinimalTuple, NamedTuplestoreScanState::tupdesc, tuplestore_alloc_read_pointer(), tuplestore_rescan(), and tuplestore_select_read_pointer().

Referenced by ExecInitNode().

◆ ExecNamedTuplestoreScan()

static TupleTableSlot * ExecNamedTuplestoreScan ( PlanState *  pstate )
static

Definition at line 67 of file nodeNamedtuplestorescan.c.

68{
70
71 return ExecScan(&node->ss,
74}
TupleTableSlot * ExecScan(ScanState *node, ExecScanAccessMtd accessMtd, ExecScanRecheckMtd recheckMtd)
Definition: execScan.c:47
bool(* ExecScanRecheckMtd)(ScanState *node, TupleTableSlot *slot)
Definition: executor.h:577
TupleTableSlot *(* ExecScanAccessMtd)(ScanState *node)
Definition: executor.h:576
static TupleTableSlot * NamedTuplestoreScanNext(NamedTuplestoreScanState *node)
static bool NamedTuplestoreScanRecheck(NamedTuplestoreScanState *node, TupleTableSlot *slot)
#define castNode(_type_, nodeptr)
Definition: nodes.h:182

References castNode, ExecScan(), NamedTuplestoreScanNext(), NamedTuplestoreScanRecheck(), and NamedTuplestoreScanState::ss.

Referenced by ExecInitNamedTuplestoreScan().

◆ ExecReScanNamedTuplestoreScan()

void ExecReScanNamedTuplestoreScan ( NamedTuplestoreScanState *  node )

Definition at line 164 of file nodeNamedtuplestorescan.c.

165{
166 Tuplestorestate *tuplestorestate = node->relation;
167
168 if (node->ss.ps.ps_ResultTupleSlot)
170
171 ExecScanReScan(&node->ss);
172
173 /*
174 * Rewind my own pointer.
175 */
176 tuplestore_select_read_pointer(tuplestorestate, node->readptr);
177 tuplestore_rescan(tuplestorestate);
178}
void ExecScanReScan(ScanState *node)
Definition: execScan.c:108
TupleTableSlot * ps_ResultTupleSlot
Definition: execnodes.h:1197
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:458

References ExecClearTuple(), ExecScanReScan(), ScanState::ps, PlanState::ps_ResultTupleSlot, NamedTuplestoreScanState::readptr, NamedTuplestoreScanState::relation, NamedTuplestoreScanState::ss, tuplestore_rescan(), and tuplestore_select_read_pointer().

Referenced by ExecReScan().

◆ NamedTuplestoreScanNext()

static TupleTableSlot * NamedTuplestoreScanNext ( NamedTuplestoreScanState *  node )
static

Definition at line 31 of file nodeNamedtuplestorescan.c.

32{
33 TupleTableSlot *slot;
34
35 /* We intentionally do not support backward scan. */
37
38 /*
39 * Get the next tuple from tuplestore. Return NULL if no more tuples.
40 */
41 slot = node->ss.ss_ScanTupleSlot;
43 (void) tuplestore_gettupleslot(node->relation, true, false, slot);
44 return slot;
45}
#define ScanDirectionIsForward(direction)
Definition: sdir.h:64
ScanDirection es_direction
Definition: execnodes.h:659
TupleTableSlot * ss_ScanTupleSlot
Definition: execnodes.h:1618
bool tuplestore_gettupleslot(Tuplestorestate *state, bool forward, bool copy, TupleTableSlot *slot)
Definition: tuplestore.c:1130

References Assert(), EState::es_direction, ScanState::ps, NamedTuplestoreScanState::readptr, NamedTuplestoreScanState::relation, ScanDirectionIsForward, NamedTuplestoreScanState::ss, ScanState::ss_ScanTupleSlot, PlanState::state, tuplestore_gettupleslot(), and tuplestore_select_read_pointer().

Referenced by ExecNamedTuplestoreScan().

◆ NamedTuplestoreScanRecheck()

static bool NamedTuplestoreScanRecheck ( NamedTuplestoreScanState *  node,
TupleTableSlot *  slot 
)
static

Definition at line 52 of file nodeNamedtuplestorescan.c.

53{
54 /* nothing to check */
55 return true;
56}

Referenced by ExecNamedTuplestoreScan().

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