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nodeSubqueryscan.c File Reference
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Functions

static TupleTableSlotSubqueryNext (SubqueryScanState *node)
 
static bool SubqueryRecheck (SubqueryScanState *node, TupleTableSlot *slot)
 
static TupleTableSlotExecSubqueryScan (PlanState *pstate)
 
SubqueryScanStateExecInitSubqueryScan (SubqueryScan *node, EState *estate, int eflags)
 
void ExecEndSubqueryScan (SubqueryScanState *node)
 
void ExecReScanSubqueryScan (SubqueryScanState *node)
 

Function Documentation

◆ ExecEndSubqueryScan()

void ExecEndSubqueryScan ( SubqueryScanState node)

Definition at line 168 of file nodeSubqueryscan.c.

References ExecClearTuple(), ExecEndNode(), ExecFreeExprContext(), ScanState::ps, PlanState::ps_ResultTupleSlot, SubqueryScanState::ss, ScanState::ss_ScanTupleSlot, and SubqueryScanState::subplan.

Referenced by ExecEndNode().

169 {
170  /*
171  * Free the exprcontext
172  */
173  ExecFreeExprContext(&node->ss.ps);
174 
175  /*
176  * clean out the upper tuple table
177  */
178  if (node->ss.ps.ps_ResultTupleSlot)
181 
182  /*
183  * close down subquery
184  */
185  ExecEndNode(node->subplan);
186 }
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:425
void ExecEndNode(PlanState *node)
Definition: execProcnode.c:537
TupleTableSlot * ss_ScanTupleSlot
Definition: execnodes.h:1329
void ExecFreeExprContext(PlanState *planstate)
Definition: execUtils.c:614
PlanState ps
Definition: execnodes.h:1326
TupleTableSlot * ps_ResultTupleSlot
Definition: execnodes.h:977
PlanState * subplan
Definition: execnodes.h:1633

◆ ExecInitSubqueryScan()

SubqueryScanState* ExecInitSubqueryScan ( SubqueryScan node,
EState estate,
int  eflags 
)

Definition at line 97 of file nodeSubqueryscan.c.

References Assert, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecAssignScanProjectionInfo(), ExecGetResultSlotOps(), ExecGetResultType(), ExecInitNode(), ExecInitQual(), ExecInitResultTypeTL(), ExecInitScanTupleSlot(), PlanState::ExecProcNode, ExecSubqueryScan(), innerPlan, makeNode, outerPlan, Scan::plan, PlanState::plan, ScanState::ps, Plan::qual, PlanState::qual, PlanState::resultops, PlanState::resultopsfixed, PlanState::resultopsset, SubqueryScan::scan, PlanState::scanops, PlanState::scanopsfixed, PlanState::scanopsset, SubqueryScanState::ss, PlanState::state, SubqueryScan::subplan, and SubqueryScanState::subplan.

Referenced by ExecInitNode().

98 {
99  SubqueryScanState *subquerystate;
100 
101  /* check for unsupported flags */
102  Assert(!(eflags & EXEC_FLAG_MARK));
103 
104  /* SubqueryScan should not have any "normal" children */
105  Assert(outerPlan(node) == NULL);
106  Assert(innerPlan(node) == NULL);
107 
108  /*
109  * create state structure
110  */
111  subquerystate = makeNode(SubqueryScanState);
112  subquerystate->ss.ps.plan = (Plan *) node;
113  subquerystate->ss.ps.state = estate;
114  subquerystate->ss.ps.ExecProcNode = ExecSubqueryScan;
115 
116  /*
117  * Miscellaneous initialization
118  *
119  * create expression context for node
120  */
121  ExecAssignExprContext(estate, &subquerystate->ss.ps);
122 
123  /*
124  * initialize subquery
125  */
126  subquerystate->subplan = ExecInitNode(node->subplan, estate, eflags);
127 
128  /*
129  * Initialize scan slot and type (needed by ExecAssignScanProjectionInfo)
130  */
131  ExecInitScanTupleSlot(estate, &subquerystate->ss,
132  ExecGetResultType(subquerystate->subplan),
133  ExecGetResultSlotOps(subquerystate->subplan, NULL));
134 
135  /*
136  * The slot used as the scantuple isn't the slot above (outside of EPQ),
137  * but the one from the node below.
138  */
139  subquerystate->ss.ps.scanopsset = true;
140  subquerystate->ss.ps.scanops = ExecGetResultSlotOps(subquerystate->subplan,
141  &subquerystate->ss.ps.scanopsfixed);
142  subquerystate->ss.ps.resultopsset = true;
143  subquerystate->ss.ps.resultops = subquerystate->ss.ps.scanops;
144  subquerystate->ss.ps.resultopsfixed = subquerystate->ss.ps.scanopsfixed;
145 
146  /*
147  * Initialize result type and projection.
148  */
149  ExecInitResultTypeTL(&subquerystate->ss.ps);
150  ExecAssignScanProjectionInfo(&subquerystate->ss);
151 
152  /*
153  * initialize child expressions
154  */
155  subquerystate->ss.ps.qual =
156  ExecInitQual(node->scan.plan.qual, (PlanState *) subquerystate);
157 
158  return subquerystate;
159 }
List * qual
Definition: plannodes.h:143
Plan plan
Definition: plannodes.h:344
static TupleTableSlot * ExecSubqueryScan(PlanState *pstate)
const TupleTableSlotOps * ExecGetResultSlotOps(PlanState *planstate, bool *isfixed)
Definition: execUtils.c:463
EState * state
Definition: execnodes.h:941
ExprState * ExecInitQual(List *qual, PlanState *parent)
Definition: execExpr.c:207
const TupleTableSlotOps * resultops
Definition: execnodes.h:1014
PlanState ps
Definition: execnodes.h:1326
void ExecAssignScanProjectionInfo(ScanState *node)
Definition: execScan.c:272
#define innerPlan(node)
Definition: plannodes.h:171
void ExecInitScanTupleSlot(EState *estate, ScanState *scanstate, TupleDesc tupledesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1781
const TupleTableSlotOps * scanops
Definition: execnodes.h:1011
void ExecInitResultTypeTL(PlanState *planstate)
Definition: execTuples.c:1725
PlanState * subplan
Definition: execnodes.h:1633
bool resultopsset
Definition: execnodes.h:1022
#define outerPlan(node)
Definition: plannodes.h:172
ExecProcNodeMtd ExecProcNode
Definition: execnodes.h:945
Plan * plan
Definition: execnodes.h:939
bool scanopsfixed
Definition: execnodes.h:1015
#define makeNode(_type_)
Definition: nodes.h:573
#define Assert(condition)
Definition: c.h:739
#define EXEC_FLAG_MARK
Definition: executor.h:59
void ExecAssignExprContext(EState *estate, PlanState *planstate)
Definition: execUtils.c:444
bool scanopsset
Definition: execnodes.h:1019
TupleDesc ExecGetResultType(PlanState *planstate)
Definition: execUtils.c:454
ExprState * qual
Definition: execnodes.h:960
bool resultopsfixed
Definition: execnodes.h:1018
PlanState * ExecInitNode(Plan *node, EState *estate, int eflags)
Definition: execProcnode.c:138
Plan * subplan
Definition: plannodes.h:515

◆ ExecReScanSubqueryScan()

void ExecReScanSubqueryScan ( SubqueryScanState node)

Definition at line 195 of file nodeSubqueryscan.c.

References PlanState::chgParam, ExecReScan(), ExecScanReScan(), ScanState::ps, SubqueryScanState::ss, SubqueryScanState::subplan, and UpdateChangedParamSet().

Referenced by ExecReScan().

196 {
197  ExecScanReScan(&node->ss);
198 
199  /*
200  * ExecReScan doesn't know about my subplan, so I have to do
201  * changed-parameter signaling myself. This is just as well, because the
202  * subplan has its own memory context in which its chgParam state lives.
203  */
204  if (node->ss.ps.chgParam != NULL)
206 
207  /*
208  * if chgParam of subnode is not null then plan will be re-scanned by
209  * first ExecProcNode.
210  */
211  if (node->subplan->chgParam == NULL)
212  ExecReScan(node->subplan);
213 }
void ExecReScan(PlanState *node)
Definition: execAmi.c:75
PlanState ps
Definition: execnodes.h:1326
PlanState * subplan
Definition: execnodes.h:1633
Bitmapset * chgParam
Definition: execnodes.h:971
void UpdateChangedParamSet(PlanState *node, Bitmapset *newchg)
Definition: execUtils.c:802
void ExecScanReScan(ScanState *node)
Definition: execScan.c:299

◆ ExecSubqueryScan()

static TupleTableSlot* ExecSubqueryScan ( PlanState pstate)
static

Definition at line 83 of file nodeSubqueryscan.c.

References castNode, ExecScan(), SubqueryScanState::ss, SubqueryNext(), and SubqueryRecheck().

Referenced by ExecInitSubqueryScan().

84 {
86 
87  return ExecScan(&node->ss,
90 }
#define castNode(_type_, nodeptr)
Definition: nodes.h:594
TupleTableSlot * ExecScan(ScanState *node, ExecScanAccessMtd accessMtd, ExecScanRecheckMtd recheckMtd)
Definition: execScan.c:158
static TupleTableSlot * SubqueryNext(SubqueryScanState *node)
bool(* ExecScanRecheckMtd)(ScanState *node, TupleTableSlot *slot)
Definition: executor.h:426
static bool SubqueryRecheck(SubqueryScanState *node, TupleTableSlot *slot)
TupleTableSlot *(* ExecScanAccessMtd)(ScanState *node)
Definition: executor.h:425

◆ SubqueryNext()

static TupleTableSlot * SubqueryNext ( SubqueryScanState node)
static

Definition at line 46 of file nodeSubqueryscan.c.

References ExecProcNode(), and SubqueryScanState::subplan.

Referenced by ExecSubqueryScan().

47 {
48  TupleTableSlot *slot;
49 
50  /*
51  * Get the next tuple from the sub-query.
52  */
53  slot = ExecProcNode(node->subplan);
54 
55  /*
56  * We just return the subplan's result slot, rather than expending extra
57  * cycles for ExecCopySlot(). (Our own ScanTupleSlot is used only for
58  * EvalPlanQual rechecks.)
59  */
60  return slot;
61 }
PlanState * subplan
Definition: execnodes.h:1633
static TupleTableSlot * ExecProcNode(PlanState *node)
Definition: executor.h:235

◆ SubqueryRecheck()

static bool SubqueryRecheck ( SubqueryScanState node,
TupleTableSlot slot 
)
static

Definition at line 67 of file nodeSubqueryscan.c.

Referenced by ExecSubqueryScan().

68 {
69  /* nothing to check */
70  return true;
71 }