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nodeMaterial.h File Reference
#include "nodes/execnodes.h"
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Functions

MaterialStateExecInitMaterial (Material *node, EState *estate, int eflags)
 
void ExecEndMaterial (MaterialState *node)
 
void ExecMaterialMarkPos (MaterialState *node)
 
void ExecMaterialRestrPos (MaterialState *node)
 
void ExecReScanMaterial (MaterialState *node)
 

Function Documentation

◆ ExecEndMaterial()

void ExecEndMaterial ( MaterialState node)

Definition at line 240 of file nodeMaterial.c.

241 {
242  /*
243  * Release tuplestore resources
244  */
245  if (node->tuplestorestate != NULL)
247  node->tuplestorestate = NULL;
248 
249  /*
250  * shut down the subplan
251  */
253 }
void ExecEndNode(PlanState *node)
Definition: execProcnode.c:557
#define outerPlanState(node)
Definition: execnodes.h:1139
Tuplestorestate * tuplestorestate
Definition: execnodes.h:2151
void tuplestore_end(Tuplestorestate *state)
Definition: tuplestore.c:453

References ExecEndNode(), outerPlanState, tuplestore_end(), and MaterialState::tuplestorestate.

Referenced by ExecEndNode().

◆ ExecInitMaterial()

MaterialState* ExecInitMaterial ( Material node,
EState estate,
int  eflags 
)

Definition at line 164 of file nodeMaterial.c.

165 {
166  MaterialState *matstate;
167  Plan *outerPlan;
168 
169  /*
170  * create state structure
171  */
172  matstate = makeNode(MaterialState);
173  matstate->ss.ps.plan = (Plan *) node;
174  matstate->ss.ps.state = estate;
175  matstate->ss.ps.ExecProcNode = ExecMaterial;
176 
177  /*
178  * We must have a tuplestore buffering the subplan output to do backward
179  * scan or mark/restore. We also prefer to materialize the subplan output
180  * if we might be called on to rewind and replay it many times. However,
181  * if none of these cases apply, we can skip storing the data.
182  */
183  matstate->eflags = (eflags & (EXEC_FLAG_REWIND |
185  EXEC_FLAG_MARK));
186 
187  /*
188  * Tuplestore's interpretation of the flag bits is subtly different from
189  * the general executor meaning: it doesn't think BACKWARD necessarily
190  * means "backwards all the way to start". If told to support BACKWARD we
191  * must include REWIND in the tuplestore eflags, else tuplestore_trim
192  * might throw away too much.
193  */
194  if (eflags & EXEC_FLAG_BACKWARD)
195  matstate->eflags |= EXEC_FLAG_REWIND;
196 
197  matstate->eof_underlying = false;
198  matstate->tuplestorestate = NULL;
199 
200  /*
201  * Miscellaneous initialization
202  *
203  * Materialization nodes don't need ExprContexts because they never call
204  * ExecQual or ExecProject.
205  */
206 
207  /*
208  * initialize child nodes
209  *
210  * We shield the child node from the need to support REWIND, BACKWARD, or
211  * MARK/RESTORE.
212  */
214 
215  outerPlan = outerPlan(node);
216  outerPlanState(matstate) = ExecInitNode(outerPlan, estate, eflags);
217 
218  /*
219  * Initialize result type and slot. No need to initialize projection info
220  * because this node doesn't do projections.
221  *
222  * material nodes only return tuples from their materialized relation.
223  */
225  matstate->ss.ps.ps_ProjInfo = NULL;
226 
227  /*
228  * initialize tuple type.
229  */
231 
232  return matstate;
233 }
PlanState * ExecInitNode(Plan *node, EState *estate, int eflags)
Definition: execProcnode.c:142
void ExecInitResultTupleSlotTL(PlanState *planstate, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1798
const TupleTableSlotOps TTSOpsMinimalTuple
Definition: execTuples.c:85
void ExecCreateScanSlotFromOuterPlan(EState *estate, ScanState *scanstate, const TupleTableSlotOps *tts_ops)
Definition: execUtils.c:664
#define EXEC_FLAG_BACKWARD
Definition: executor.h:68
#define EXEC_FLAG_REWIND
Definition: executor.h:67
#define EXEC_FLAG_MARK
Definition: executor.h:69
static TupleTableSlot * ExecMaterial(PlanState *pstate)
Definition: nodeMaterial.c:39
#define makeNode(_type_)
Definition: nodes.h:155
#define outerPlan(node)
Definition: plannodes.h:182
bool eof_underlying
Definition: execnodes.h:2150
ScanState ss
Definition: execnodes.h:2148
Plan * plan
Definition: execnodes.h:1043
EState * state
Definition: execnodes.h:1045
ProjectionInfo * ps_ProjInfo
Definition: execnodes.h:1083
ExecProcNodeMtd ExecProcNode
Definition: execnodes.h:1049
PlanState ps
Definition: execnodes.h:1480

References MaterialState::eflags, MaterialState::eof_underlying, EXEC_FLAG_BACKWARD, EXEC_FLAG_MARK, EXEC_FLAG_REWIND, ExecCreateScanSlotFromOuterPlan(), ExecInitNode(), ExecInitResultTupleSlotTL(), ExecMaterial(), PlanState::ExecProcNode, makeNode, outerPlan, outerPlanState, PlanState::plan, ScanState::ps, PlanState::ps_ProjInfo, MaterialState::ss, PlanState::state, TTSOpsMinimalTuple, and MaterialState::tuplestorestate.

Referenced by ExecInitNode().

◆ ExecMaterialMarkPos()

void ExecMaterialMarkPos ( MaterialState node)

Definition at line 262 of file nodeMaterial.c.

263 {
264  Assert(node->eflags & EXEC_FLAG_MARK);
265 
266  /*
267  * if we haven't materialized yet, just return.
268  */
269  if (!node->tuplestorestate)
270  return;
271 
272  /*
273  * copy the active read pointer to the mark.
274  */
276 
277  /*
278  * since we may have advanced the mark, try to truncate the tuplestore.
279  */
281 }
Assert(fmt[strlen(fmt) - 1] !='\n')
void tuplestore_trim(Tuplestorestate *state)
Definition: tuplestore.c:1360
void tuplestore_copy_read_pointer(Tuplestorestate *state, int srcptr, int destptr)
Definition: tuplestore.c:1268

References Assert(), MaterialState::eflags, EXEC_FLAG_MARK, tuplestore_copy_read_pointer(), tuplestore_trim(), and MaterialState::tuplestorestate.

Referenced by ExecMarkPos().

◆ ExecMaterialRestrPos()

void ExecMaterialRestrPos ( MaterialState node)

Definition at line 290 of file nodeMaterial.c.

291 {
292  Assert(node->eflags & EXEC_FLAG_MARK);
293 
294  /*
295  * if we haven't materialized yet, just return.
296  */
297  if (!node->tuplestorestate)
298  return;
299 
300  /*
301  * copy the mark to the active read pointer.
302  */
304 }

References Assert(), MaterialState::eflags, EXEC_FLAG_MARK, tuplestore_copy_read_pointer(), and MaterialState::tuplestorestate.

Referenced by ExecRestrPos().

◆ ExecReScanMaterial()

void ExecReScanMaterial ( MaterialState node)

Definition at line 313 of file nodeMaterial.c.

314 {
316 
318 
319  if (node->eflags != 0)
320  {
321  /*
322  * If we haven't materialized yet, just return. If outerplan's
323  * chgParam is not NULL then it will be re-scanned by ExecProcNode,
324  * else no reason to re-scan it at all.
325  */
326  if (!node->tuplestorestate)
327  return;
328 
329  /*
330  * If subnode is to be rescanned then we forget previous stored
331  * results; we have to re-read the subplan and re-store. Also, if we
332  * told tuplestore it needn't support rescan, we lose and must
333  * re-read. (This last should not happen in common cases; else our
334  * caller lied by not passing EXEC_FLAG_REWIND to us.)
335  *
336  * Otherwise we can just rewind and rescan the stored output. The
337  * state of the subnode does not change.
338  */
339  if (outerPlan->chgParam != NULL ||
340  (node->eflags & EXEC_FLAG_REWIND) == 0)
341  {
343  node->tuplestorestate = NULL;
344  if (outerPlan->chgParam == NULL)
346  node->eof_underlying = false;
347  }
348  else
350  }
351  else
352  {
353  /* In this case we are just passing on the subquery's output */
354 
355  /*
356  * if chgParam of subnode is not null then plan will be re-scanned by
357  * first ExecProcNode.
358  */
359  if (outerPlan->chgParam == NULL)
361  node->eof_underlying = false;
362  }
363 }
void ExecReScan(PlanState *node)
Definition: execAmi.c:78
TupleTableSlot * ps_ResultTupleSlot
Definition: execnodes.h:1081
void tuplestore_rescan(Tuplestorestate *state)
Definition: tuplestore.c:1233
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:433

References MaterialState::eflags, MaterialState::eof_underlying, EXEC_FLAG_REWIND, ExecClearTuple(), ExecReScan(), outerPlan, outerPlanState, ScanState::ps, PlanState::ps_ResultTupleSlot, MaterialState::ss, tuplestore_end(), tuplestore_rescan(), and MaterialState::tuplestorestate.

Referenced by ExecReScan().