PostgreSQL Source Code git master
All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Pages
nodeResult.c File Reference
#include "postgres.h"
#include "executor/executor.h"
#include "executor/nodeResult.h"
#include "miscadmin.h"
Include dependency graph for nodeResult.c:

Go to the source code of this file.

Functions

static TupleTableSlotExecResult (PlanState *pstate)
 
void ExecResultMarkPos (ResultState *node)
 
void ExecResultRestrPos (ResultState *node)
 
ResultStateExecInitResult (Result *node, EState *estate, int eflags)
 
void ExecEndResult (ResultState *node)
 
void ExecReScanResult (ResultState *node)
 

Function Documentation

◆ ExecEndResult()

void ExecEndResult ( ResultState node)

Definition at line 240 of file nodeResult.c.

241{
242 /*
243 * shut down subplans
244 */
246}
void ExecEndNode(PlanState *node)
Definition: execProcnode.c:562
#define outerPlanState(node)
Definition: execnodes.h:1221

References ExecEndNode(), and outerPlanState.

Referenced by ExecEndNode().

◆ ExecInitResult()

ResultState * ExecInitResult ( Result node,
EState estate,
int  eflags 
)

Definition at line 180 of file nodeResult.c.

181{
182 ResultState *resstate;
183
184 /* check for unsupported flags */
185 Assert(!(eflags & (EXEC_FLAG_MARK | EXEC_FLAG_BACKWARD)) ||
186 outerPlan(node) != NULL);
187
188 /*
189 * create state structure
190 */
191 resstate = makeNode(ResultState);
192 resstate->ps.plan = (Plan *) node;
193 resstate->ps.state = estate;
194 resstate->ps.ExecProcNode = ExecResult;
195
196 resstate->rs_done = false;
197 resstate->rs_checkqual = (node->resconstantqual != NULL);
198
199 /*
200 * Miscellaneous initialization
201 *
202 * create expression context for node
203 */
204 ExecAssignExprContext(estate, &resstate->ps);
205
206 /*
207 * initialize child nodes
208 */
209 outerPlanState(resstate) = ExecInitNode(outerPlan(node), estate, eflags);
210
211 /*
212 * we don't use inner plan
213 */
214 Assert(innerPlan(node) == NULL);
215
216 /*
217 * Initialize result slot, type and projection.
218 */
220 ExecAssignProjectionInfo(&resstate->ps, NULL);
221
222 /*
223 * initialize child expressions
224 */
225 resstate->ps.qual =
226 ExecInitQual(node->plan.qual, (PlanState *) resstate);
227 resstate->resconstantqual =
228 ExecInitQual((List *) node->resconstantqual, (PlanState *) resstate);
229
230 return resstate;
231}
#define Assert(condition)
Definition: c.h:812
ExprState * ExecInitQual(List *qual, PlanState *parent)
Definition: execExpr.c:224
PlanState * ExecInitNode(Plan *node, EState *estate, int eflags)
Definition: execProcnode.c:142
const TupleTableSlotOps TTSOpsVirtual
Definition: execTuples.c:84
void ExecInitResultTupleSlotTL(PlanState *planstate, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1986
void ExecAssignExprContext(EState *estate, PlanState *planstate)
Definition: execUtils.c:485
void ExecAssignProjectionInfo(PlanState *planstate, TupleDesc inputDesc)
Definition: execUtils.c:583
#define EXEC_FLAG_BACKWARD
Definition: executor.h:68
#define EXEC_FLAG_MARK
Definition: executor.h:69
static TupleTableSlot * ExecResult(PlanState *pstate)
Definition: nodeResult.c:67
#define makeNode(_type_)
Definition: nodes.h:155
#define innerPlan(node)
Definition: plannodes.h:182
#define outerPlan(node)
Definition: plannodes.h:183
Definition: pg_list.h:54
ExprState * qual
Definition: execnodes.h:1146
Plan * plan
Definition: execnodes.h:1125
EState * state
Definition: execnodes.h:1127
ExecProcNodeMtd ExecProcNode
Definition: execnodes.h:1131
List * qual
Definition: plannodes.h:154
ExprState * resconstantqual
Definition: execnodes.h:1329
bool rs_done
Definition: execnodes.h:1330
PlanState ps
Definition: execnodes.h:1328
bool rs_checkqual
Definition: execnodes.h:1331
Node * resconstantqual
Definition: plannodes.h:200
Plan plan
Definition: plannodes.h:199

References Assert, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, ExecAssignExprContext(), ExecAssignProjectionInfo(), ExecInitNode(), ExecInitQual(), ExecInitResultTupleSlotTL(), PlanState::ExecProcNode, ExecResult(), innerPlan, makeNode, outerPlan, outerPlanState, PlanState::plan, Result::plan, ResultState::ps, PlanState::qual, Plan::qual, ResultState::resconstantqual, Result::resconstantqual, ResultState::rs_checkqual, ResultState::rs_done, PlanState::state, and TTSOpsVirtual.

Referenced by ExecInitNode().

◆ ExecReScanResult()

void ExecReScanResult ( ResultState node)

Definition at line 249 of file nodeResult.c.

250{
252
253 node->rs_done = false;
254 node->rs_checkqual = (node->resconstantqual != NULL);
255
256 /*
257 * If chgParam of subnode is not null then plan will be re-scanned by
258 * first ExecProcNode.
259 */
260 if (outerPlan && outerPlan->chgParam == NULL)
262}
void ExecReScan(PlanState *node)
Definition: execAmi.c:76

References ExecReScan(), outerPlan, outerPlanState, ResultState::resconstantqual, ResultState::rs_checkqual, and ResultState::rs_done.

Referenced by ExecReScan().

◆ ExecResult()

static TupleTableSlot * ExecResult ( PlanState pstate)
static

Definition at line 67 of file nodeResult.c.

68{
69 ResultState *node = castNode(ResultState, pstate);
70 TupleTableSlot *outerTupleSlot;
72 ExprContext *econtext;
73
75
76 econtext = node->ps.ps_ExprContext;
77
78 /*
79 * check constant qualifications like (2 > 1), if not already done
80 */
81 if (node->rs_checkqual)
82 {
83 bool qualResult = ExecQual(node->resconstantqual, econtext);
84
85 node->rs_checkqual = false;
86 if (!qualResult)
87 {
88 node->rs_done = true;
89 return NULL;
90 }
91 }
92
93 /*
94 * Reset per-tuple memory context to free any expression evaluation
95 * storage allocated in the previous tuple cycle.
96 */
97 ResetExprContext(econtext);
98
99 /*
100 * if rs_done is true then it means that we were asked to return a
101 * constant tuple and we already did the last time ExecResult() was
102 * called, OR that we failed the constant qual check. Either way, now we
103 * are through.
104 */
105 if (!node->rs_done)
106 {
108
109 if (outerPlan != NULL)
110 {
111 /*
112 * retrieve tuples from the outer plan until there are no more.
113 */
114 outerTupleSlot = ExecProcNode(outerPlan);
115
116 if (TupIsNull(outerTupleSlot))
117 return NULL;
118
119 /*
120 * prepare to compute projection expressions, which will expect to
121 * access the input tuples as varno OUTER.
122 */
123 econtext->ecxt_outertuple = outerTupleSlot;
124 }
125 else
126 {
127 /*
128 * if we don't have an outer plan, then we are just generating the
129 * results from a constant target list. Do it only once.
130 */
131 node->rs_done = true;
132 }
133
134 /* form the result tuple using ExecProject(), and return it */
135 return ExecProject(node->ps.ps_ProjInfo);
136 }
137
138 return NULL;
139}
static TupleTableSlot * ExecProject(ProjectionInfo *projInfo)
Definition: executor.h:389
#define ResetExprContext(econtext)
Definition: executor.h:557
static bool ExecQual(ExprState *state, ExprContext *econtext)
Definition: executor.h:426
static TupleTableSlot * ExecProcNode(PlanState *node)
Definition: executor.h:267
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:122
#define castNode(_type_, nodeptr)
Definition: nodes.h:176
TupleTableSlot * ecxt_outertuple
Definition: execnodes.h:262
ExprContext * ps_ExprContext
Definition: execnodes.h:1164
ProjectionInfo * ps_ProjInfo
Definition: execnodes.h:1165
#define TupIsNull(slot)
Definition: tuptable.h:306

References castNode, CHECK_FOR_INTERRUPTS, ExprContext::ecxt_outertuple, ExecProcNode(), ExecProject(), ExecQual(), outerPlan, outerPlanState, ResultState::ps, PlanState::ps_ExprContext, PlanState::ps_ProjInfo, ResultState::resconstantqual, ResetExprContext, ResultState::rs_checkqual, ResultState::rs_done, and TupIsNull.

Referenced by ExecInitResult().

◆ ExecResultMarkPos()

void ExecResultMarkPos ( ResultState node)

Definition at line 146 of file nodeResult.c.

147{
149
150 if (outerPlan != NULL)
152 else
153 elog(DEBUG2, "Result nodes do not support mark/restore");
154}
#define DEBUG2
Definition: elog.h:29
#define elog(elevel,...)
Definition: elog.h:225
void ExecMarkPos(PlanState *node)
Definition: execAmi.c:326

References DEBUG2, elog, ExecMarkPos(), outerPlan, and outerPlanState.

Referenced by ExecMarkPos().

◆ ExecResultRestrPos()

void ExecResultRestrPos ( ResultState node)

Definition at line 161 of file nodeResult.c.

162{
164
165 if (outerPlan != NULL)
167 else
168 elog(ERROR, "Result nodes do not support mark/restore");
169}
#define ERROR
Definition: elog.h:39
void ExecRestrPos(PlanState *node)
Definition: execAmi.c:375

References elog, ERROR, ExecRestrPos(), outerPlan, and outerPlanState.

Referenced by ExecRestrPos().