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nodeFunctionscan.c
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1 /*-------------------------------------------------------------------------
2  *
3  * nodeFunctionscan.c
4  * Support routines for scanning RangeFunctions (functions in rangetable).
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/executor/nodeFunctionscan.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 /*
16  * INTERFACE ROUTINES
17  * ExecFunctionScan scans a function.
18  * ExecFunctionNext retrieve next tuple in sequential order.
19  * ExecInitFunctionScan creates and initializes a functionscan node.
20  * ExecEndFunctionScan releases any storage allocated.
21  * ExecReScanFunctionScan rescans the function
22  */
23 #include "postgres.h"
24 
25 #include "catalog/pg_type.h"
27 #include "funcapi.h"
28 #include "nodes/nodeFuncs.h"
29 #include "utils/builtins.h"
30 #include "utils/memutils.h"
31 
32 
33 /*
34  * Runtime data for each function being scanned.
35  */
37 {
38  SetExprState *setexpr; /* state of the expression being evaluated */
39  TupleDesc tupdesc; /* desc of the function result type */
40  int colcount; /* expected number of result columns */
41  Tuplestorestate *tstore; /* holds the function result set */
42  int64 rowcount; /* # of rows in result set, -1 if not known */
43  TupleTableSlot *func_slot; /* function result slot (or NULL) */
45 
47 
48 
49 /* ----------------------------------------------------------------
50  * Scan Support
51  * ----------------------------------------------------------------
52  */
53 /* ----------------------------------------------------------------
54  * FunctionNext
55  *
56  * This is a workhorse for ExecFunctionScan
57  * ----------------------------------------------------------------
58  */
59 static TupleTableSlot *
61 {
62  EState *estate;
63  ScanDirection direction;
64  TupleTableSlot *scanslot;
65  bool alldone;
66  int64 oldpos;
67  int funcno;
68  int att;
69 
70  /*
71  * get information from the estate and scan state
72  */
73  estate = node->ss.ps.state;
74  direction = estate->es_direction;
75  scanslot = node->ss.ss_ScanTupleSlot;
76 
77  if (node->simple)
78  {
79  /*
80  * Fast path for the trivial case: the function return type and scan
81  * result type are the same, so we fetch the function result straight
82  * into the scan result slot. No need to update ordinality or
83  * rowcounts either.
84  */
85  Tuplestorestate *tstore = node->funcstates[0].tstore;
86 
87  /*
88  * If first time through, read all tuples from function and put them
89  * in a tuplestore. Subsequent calls just fetch tuples from
90  * tuplestore.
91  */
92  if (tstore == NULL)
93  {
94  node->funcstates[0].tstore = tstore =
96  node->ss.ps.ps_ExprContext,
97  node->argcontext,
98  node->funcstates[0].tupdesc,
99  node->eflags & EXEC_FLAG_BACKWARD);
100 
101  /*
102  * paranoia - cope if the function, which may have constructed the
103  * tuplestore itself, didn't leave it pointing at the start. This
104  * call is fast, so the overhead shouldn't be an issue.
105  */
106  tuplestore_rescan(tstore);
107  }
108 
109  /*
110  * Get the next tuple from tuplestore.
111  */
112  (void) tuplestore_gettupleslot(tstore,
113  ScanDirectionIsForward(direction),
114  false,
115  scanslot);
116  return scanslot;
117  }
118 
119  /*
120  * Increment or decrement ordinal counter before checking for end-of-data,
121  * so that we can move off either end of the result by 1 (and no more than
122  * 1) without losing correct count. See PortalRunSelect for why we can
123  * assume that we won't be called repeatedly in the end-of-data state.
124  */
125  oldpos = node->ordinal;
126  if (ScanDirectionIsForward(direction))
127  node->ordinal++;
128  else
129  node->ordinal--;
130 
131  /*
132  * Main loop over functions.
133  *
134  * We fetch the function results into func_slots (which match the function
135  * return types), and then copy the values to scanslot (which matches the
136  * scan result type), setting the ordinal column (if any) as well.
137  */
138  ExecClearTuple(scanslot);
139  att = 0;
140  alldone = true;
141  for (funcno = 0; funcno < node->nfuncs; funcno++)
142  {
143  FunctionScanPerFuncState *fs = &node->funcstates[funcno];
144  int i;
145 
146  /*
147  * If first time through, read all tuples from function and put them
148  * in a tuplestore. Subsequent calls just fetch tuples from
149  * tuplestore.
150  */
151  if (fs->tstore == NULL)
152  {
153  fs->tstore =
155  node->ss.ps.ps_ExprContext,
156  node->argcontext,
157  fs->tupdesc,
158  node->eflags & EXEC_FLAG_BACKWARD);
159 
160  /*
161  * paranoia - cope if the function, which may have constructed the
162  * tuplestore itself, didn't leave it pointing at the start. This
163  * call is fast, so the overhead shouldn't be an issue.
164  */
166  }
167 
168  /*
169  * Get the next tuple from tuplestore.
170  *
171  * If we have a rowcount for the function, and we know the previous
172  * read position was out of bounds, don't try the read. This allows
173  * backward scan to work when there are mixed row counts present.
174  */
175  if (fs->rowcount != -1 && fs->rowcount < oldpos)
177  else
178  (void) tuplestore_gettupleslot(fs->tstore,
179  ScanDirectionIsForward(direction),
180  false,
181  fs->func_slot);
182 
183  if (TupIsNull(fs->func_slot))
184  {
185  /*
186  * If we ran out of data for this function in the forward
187  * direction then we now know how many rows it returned. We need
188  * to know this in order to handle backwards scans. The row count
189  * we store is actually 1+ the actual number, because we have to
190  * position the tuplestore 1 off its end sometimes.
191  */
192  if (ScanDirectionIsForward(direction) && fs->rowcount == -1)
193  fs->rowcount = node->ordinal;
194 
195  /*
196  * populate the result cols with nulls
197  */
198  for (i = 0; i < fs->colcount; i++)
199  {
200  scanslot->tts_values[att] = (Datum) 0;
201  scanslot->tts_isnull[att] = true;
202  att++;
203  }
204  }
205  else
206  {
207  /*
208  * we have a result, so just copy it to the result cols.
209  */
211 
212  for (i = 0; i < fs->colcount; i++)
213  {
214  scanslot->tts_values[att] = fs->func_slot->tts_values[i];
215  scanslot->tts_isnull[att] = fs->func_slot->tts_isnull[i];
216  att++;
217  }
218 
219  /*
220  * We're not done until every function result is exhausted; we pad
221  * the shorter results with nulls until then.
222  */
223  alldone = false;
224  }
225  }
226 
227  /*
228  * ordinal col is always last, per spec.
229  */
230  if (node->ordinality)
231  {
232  scanslot->tts_values[att] = Int64GetDatumFast(node->ordinal);
233  scanslot->tts_isnull[att] = false;
234  }
235 
236  /*
237  * If alldone, we just return the previously-cleared scanslot. Otherwise,
238  * finish creating the virtual tuple.
239  */
240  if (!alldone)
241  ExecStoreVirtualTuple(scanslot);
242 
243  return scanslot;
244 }
245 
246 /*
247  * FunctionRecheck -- access method routine to recheck a tuple in EvalPlanQual
248  */
249 static bool
251 {
252  /* nothing to check */
253  return true;
254 }
255 
256 /* ----------------------------------------------------------------
257  * ExecFunctionScan(node)
258  *
259  * Scans the function sequentially and returns the next qualifying
260  * tuple.
261  * We call the ExecScan() routine and pass it the appropriate
262  * access method functions.
263  * ----------------------------------------------------------------
264  */
265 static TupleTableSlot *
267 {
269 
270  return ExecScan(&node->ss,
273 }
274 
275 /* ----------------------------------------------------------------
276  * ExecInitFunctionScan
277  * ----------------------------------------------------------------
278  */
280 ExecInitFunctionScan(FunctionScan *node, EState *estate, int eflags)
281 {
282  FunctionScanState *scanstate;
283  int nfuncs = list_length(node->functions);
284  TupleDesc scan_tupdesc;
285  int i,
286  natts;
287  ListCell *lc;
288 
289  /* check for unsupported flags */
290  Assert(!(eflags & EXEC_FLAG_MARK));
291 
292  /*
293  * FunctionScan should not have any children.
294  */
295  Assert(outerPlan(node) == NULL);
296  Assert(innerPlan(node) == NULL);
297 
298  /*
299  * create new ScanState for node
300  */
301  scanstate = makeNode(FunctionScanState);
302  scanstate->ss.ps.plan = (Plan *) node;
303  scanstate->ss.ps.state = estate;
304  scanstate->ss.ps.ExecProcNode = ExecFunctionScan;
305  scanstate->eflags = eflags;
306 
307  /*
308  * are we adding an ordinality column?
309  */
310  scanstate->ordinality = node->funcordinality;
311 
312  scanstate->nfuncs = nfuncs;
313  if (nfuncs == 1 && !node->funcordinality)
314  scanstate->simple = true;
315  else
316  scanstate->simple = false;
317 
318  /*
319  * Ordinal 0 represents the "before the first row" position.
320  *
321  * We need to track ordinal position even when not adding an ordinality
322  * column to the result, in order to handle backwards scanning properly
323  * with multiple functions with different result sizes. (We can't position
324  * any individual function's tuplestore any more than 1 place beyond its
325  * end, so when scanning backwards, we need to know when to start
326  * including the function in the scan again.)
327  */
328  scanstate->ordinal = 0;
329 
330  /*
331  * Miscellaneous initialization
332  *
333  * create expression context for node
334  */
335  ExecAssignExprContext(estate, &scanstate->ss.ps);
336 
337  /*
338  * tuple table initialization
339  */
340  ExecInitResultTupleSlot(estate, &scanstate->ss.ps);
341  ExecInitScanTupleSlot(estate, &scanstate->ss);
342 
343  /*
344  * initialize child expressions
345  */
346  scanstate->ss.ps.qual =
347  ExecInitQual(node->scan.plan.qual, (PlanState *) scanstate);
348 
349  scanstate->funcstates = palloc(nfuncs * sizeof(FunctionScanPerFuncState));
350 
351  natts = 0;
352  i = 0;
353  foreach(lc, node->functions)
354  {
355  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
356  Node *funcexpr = rtfunc->funcexpr;
357  int colcount = rtfunc->funccolcount;
358  FunctionScanPerFuncState *fs = &scanstate->funcstates[i];
359  TypeFuncClass functypclass;
360  Oid funcrettype;
361  TupleDesc tupdesc;
362 
363  fs->setexpr =
364  ExecInitTableFunctionResult((Expr *) funcexpr,
365  scanstate->ss.ps.ps_ExprContext,
366  &scanstate->ss.ps);
367 
368  /*
369  * Don't allocate the tuplestores; the actual calls to the functions
370  * do that. NULL means that we have not called the function yet (or
371  * need to call it again after a rescan).
372  */
373  fs->tstore = NULL;
374  fs->rowcount = -1;
375 
376  /*
377  * Now determine if the function returns a simple or composite type,
378  * and build an appropriate tupdesc. Note that in the composite case,
379  * the function may now return more columns than it did when the plan
380  * was made; we have to ignore any columns beyond "colcount".
381  */
382  functypclass = get_expr_result_type(funcexpr,
383  &funcrettype,
384  &tupdesc);
385 
386  if (functypclass == TYPEFUNC_COMPOSITE)
387  {
388  /* Composite data type, e.g. a table's row type */
389  Assert(tupdesc);
390  Assert(tupdesc->natts >= colcount);
391  /* Must copy it out of typcache for safety */
392  tupdesc = CreateTupleDescCopy(tupdesc);
393  }
394  else if (functypclass == TYPEFUNC_SCALAR)
395  {
396  /* Base data type, i.e. scalar */
397  tupdesc = CreateTemplateTupleDesc(1, false);
398  TupleDescInitEntry(tupdesc,
399  (AttrNumber) 1,
400  NULL, /* don't care about the name here */
401  funcrettype,
402  -1,
403  0);
405  (AttrNumber) 1,
406  exprCollation(funcexpr));
407  }
408  else if (functypclass == TYPEFUNC_RECORD)
409  {
410  tupdesc = BuildDescFromLists(rtfunc->funccolnames,
411  rtfunc->funccoltypes,
412  rtfunc->funccoltypmods,
413  rtfunc->funccolcollations);
414 
415  /*
416  * For RECORD results, make sure a typmod has been assigned. (The
417  * function should do this for itself, but let's cover things in
418  * case it doesn't.)
419  */
420  BlessTupleDesc(tupdesc);
421  }
422  else
423  {
424  /* crummy error message, but parser should have caught this */
425  elog(ERROR, "function in FROM has unsupported return type");
426  }
427 
428  fs->tupdesc = tupdesc;
429  fs->colcount = colcount;
430 
431  /*
432  * We only need separate slots for the function results if we are
433  * doing ordinality or multiple functions; otherwise, we'll fetch
434  * function results directly into the scan slot.
435  */
436  if (!scanstate->simple)
437  {
438  fs->func_slot = ExecInitExtraTupleSlot(estate);
440  }
441  else
442  fs->func_slot = NULL;
443 
444  natts += colcount;
445  i++;
446  }
447 
448  /*
449  * Create the combined TupleDesc
450  *
451  * If there is just one function without ordinality, the scan result
452  * tupdesc is the same as the function result tupdesc --- except that we
453  * may stuff new names into it below, so drop any rowtype label.
454  */
455  if (scanstate->simple)
456  {
457  scan_tupdesc = CreateTupleDescCopy(scanstate->funcstates[0].tupdesc);
458  scan_tupdesc->tdtypeid = RECORDOID;
459  scan_tupdesc->tdtypmod = -1;
460  }
461  else
462  {
463  AttrNumber attno = 0;
464 
465  if (node->funcordinality)
466  natts++;
467 
468  scan_tupdesc = CreateTemplateTupleDesc(natts, false);
469 
470  for (i = 0; i < nfuncs; i++)
471  {
472  TupleDesc tupdesc = scanstate->funcstates[i].tupdesc;
473  int colcount = scanstate->funcstates[i].colcount;
474  int j;
475 
476  for (j = 1; j <= colcount; j++)
477  TupleDescCopyEntry(scan_tupdesc, ++attno, tupdesc, j);
478  }
479 
480  /* If doing ordinality, add a column of type "bigint" at the end */
481  if (node->funcordinality)
482  {
483  TupleDescInitEntry(scan_tupdesc,
484  ++attno,
485  NULL, /* don't care about the name here */
486  INT8OID,
487  -1,
488  0);
489  }
490 
491  Assert(attno == natts);
492  }
493 
494  ExecAssignScanType(&scanstate->ss, scan_tupdesc);
495 
496  /*
497  * Initialize result tuple type and projection info.
498  */
499  ExecAssignResultTypeFromTL(&scanstate->ss.ps);
500  ExecAssignScanProjectionInfo(&scanstate->ss);
501 
502  /*
503  * Create a memory context that ExecMakeTableFunctionResult can use to
504  * evaluate function arguments in. We can't use the per-tuple context for
505  * this because it gets reset too often; but we don't want to leak
506  * evaluation results into the query-lifespan context either. We just
507  * need one context, because we evaluate each function separately.
508  */
510  "Table function arguments",
512 
513  return scanstate;
514 }
515 
516 /* ----------------------------------------------------------------
517  * ExecEndFunctionScan
518  *
519  * frees any storage allocated through C routines.
520  * ----------------------------------------------------------------
521  */
522 void
524 {
525  int i;
526 
527  /*
528  * Free the exprcontext
529  */
530  ExecFreeExprContext(&node->ss.ps);
531 
532  /*
533  * clean out the tuple table
534  */
537 
538  /*
539  * Release slots and tuplestore resources
540  */
541  for (i = 0; i < node->nfuncs; i++)
542  {
543  FunctionScanPerFuncState *fs = &node->funcstates[i];
544 
545  if (fs->func_slot)
547 
548  if (fs->tstore != NULL)
549  {
550  tuplestore_end(node->funcstates[i].tstore);
551  fs->tstore = NULL;
552  }
553  }
554 }
555 
556 /* ----------------------------------------------------------------
557  * ExecReScanFunctionScan
558  *
559  * Rescans the relation.
560  * ----------------------------------------------------------------
561  */
562 void
564 {
565  FunctionScan *scan = (FunctionScan *) node->ss.ps.plan;
566  int i;
567  Bitmapset *chgparam = node->ss.ps.chgParam;
568 
570  for (i = 0; i < node->nfuncs; i++)
571  {
572  FunctionScanPerFuncState *fs = &node->funcstates[i];
573 
574  if (fs->func_slot)
576  }
577 
578  ExecScanReScan(&node->ss);
579 
580  /*
581  * Here we have a choice whether to drop the tuplestores (and recompute
582  * the function outputs) or just rescan them. We must recompute if an
583  * expression contains changed parameters, else we rescan.
584  *
585  * XXX maybe we should recompute if the function is volatile? But in
586  * general the executor doesn't conditionalize its actions on that.
587  */
588  if (chgparam)
589  {
590  ListCell *lc;
591 
592  i = 0;
593  foreach(lc, scan->functions)
594  {
595  RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
596 
597  if (bms_overlap(chgparam, rtfunc->funcparams))
598  {
599  if (node->funcstates[i].tstore != NULL)
600  {
602  node->funcstates[i].tstore = NULL;
603  }
604  node->funcstates[i].rowcount = -1;
605  }
606  i++;
607  }
608  }
609 
610  /* Reset ordinality counter */
611  node->ordinal = 0;
612 
613  /* Make sure we rewind any remaining tuplestores */
614  for (i = 0; i < node->nfuncs; i++)
615  {
616  if (node->funcstates[i].tstore != NULL)
618  }
619 }
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Definition: tuplestore.c:1233
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Definition: plannodes.h:145
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Definition: tupdesc.c:102
Plan plan
Definition: plannodes.h:328
static TupleTableSlot * ExecFunctionScan(PlanState *pstate)
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Definition: execTuples.c:852
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Definition: tupdesc.h:74
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Definition: execUtils.c:445
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Definition: executor.h:411
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Definition: execnodes.h:880
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Definition: execScan.c:237
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Definition: tupdesc.c:664
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ScanDirection
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static bool FunctionRecheck(FunctionScanState *node, TupleTableSlot *slot)
int i
void ExecScanReScan(ScanState *node)
Definition: execScan.c:329
void ExecAssignScanType(ScanState *scanstate, TupleDesc tupDesc)
Definition: execUtils.c:545
#define elog
Definition: elog.h:219
int16 AttrNumber
Definition: attnum.h:21
TupleTableSlot * ExecStoreVirtualTuple(TupleTableSlot *slot)
Definition: execTuples.c:488