PostgreSQL Source Code  git master
nodeTableFuncscan.c
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1 /*-------------------------------------------------------------------------
2  *
3  * nodeTableFuncscan.c
4  * Support routines for scanning RangeTableFunc (XMLTABLE like functions).
5  *
6  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/executor/nodeTableFuncscan.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 /*
16  * INTERFACE ROUTINES
17  * ExecTableFuncscan scans a function.
18  * ExecFunctionNext retrieve next tuple in sequential order.
19  * ExecInitTableFuncscan creates and initializes a TableFuncscan node.
20  * ExecEndTableFuncscan releases any storage allocated.
21  * ExecReScanTableFuncscan rescans the function
22  */
23 #include "postgres.h"
24 
25 #include "executor/executor.h"
27 #include "executor/tablefunc.h"
28 #include "miscadmin.h"
29 #include "nodes/execnodes.h"
30 #include "utils/builtins.h"
31 #include "utils/lsyscache.h"
32 #include "utils/memutils.h"
33 #include "utils/xml.h"
34 
36 static bool TableFuncRecheck(TableFuncScanState *node, TupleTableSlot *slot);
37 
38 static void tfuncFetchRows(TableFuncScanState *tstate, ExprContext *econtext);
39 static void tfuncInitialize(TableFuncScanState *tstate, ExprContext *econtext, Datum doc);
40 static void tfuncLoadRows(TableFuncScanState *tstate, ExprContext *econtext);
41 
42 /* ----------------------------------------------------------------
43  * Scan Support
44  * ----------------------------------------------------------------
45  */
46 /* ----------------------------------------------------------------
47  * TableFuncNext
48  *
49  * This is a workhorse for ExecTableFuncscan
50  * ----------------------------------------------------------------
51  */
52 static TupleTableSlot *
54 {
55  TupleTableSlot *scanslot;
56 
57  scanslot = node->ss.ss_ScanTupleSlot;
58 
59  /*
60  * If first time through, read all tuples from function and put them in a
61  * tuplestore. Subsequent calls just fetch tuples from tuplestore.
62  */
63  if (node->tupstore == NULL)
64  tfuncFetchRows(node, node->ss.ps.ps_ExprContext);
65 
66  /*
67  * Get the next tuple from tuplestore.
68  */
69  (void) tuplestore_gettupleslot(node->tupstore,
70  true,
71  false,
72  scanslot);
73  return scanslot;
74 }
75 
76 /*
77  * TableFuncRecheck -- access method routine to recheck a tuple in EvalPlanQual
78  */
79 static bool
81 {
82  /* nothing to check */
83  return true;
84 }
85 
86 /* ----------------------------------------------------------------
87  * ExecTableFuncscan(node)
88  *
89  * Scans the function sequentially and returns the next qualifying
90  * tuple.
91  * We call the ExecScan() routine and pass it the appropriate
92  * access method functions.
93  * ----------------------------------------------------------------
94  */
95 static TupleTableSlot *
97 {
99 
100  return ExecScan(&node->ss,
103 }
104 
105 /* ----------------------------------------------------------------
106  * ExecInitTableFuncscan
107  * ----------------------------------------------------------------
108  */
110 ExecInitTableFuncScan(TableFuncScan *node, EState *estate, int eflags)
111 {
112  TableFuncScanState *scanstate;
113  TableFunc *tf = node->tablefunc;
114  TupleDesc tupdesc;
115  int i;
116 
117  /* check for unsupported flags */
118  Assert(!(eflags & EXEC_FLAG_MARK));
119 
120  /*
121  * TableFuncscan should not have any children.
122  */
123  Assert(outerPlan(node) == NULL);
124  Assert(innerPlan(node) == NULL);
125 
126  /*
127  * create new ScanState for node
128  */
129  scanstate = makeNode(TableFuncScanState);
130  scanstate->ss.ps.plan = (Plan *) node;
131  scanstate->ss.ps.state = estate;
132  scanstate->ss.ps.ExecProcNode = ExecTableFuncScan;
133 
134  /*
135  * Miscellaneous initialization
136  *
137  * create expression context for node
138  */
139  ExecAssignExprContext(estate, &scanstate->ss.ps);
140 
141  /*
142  * initialize source tuple type
143  */
144  tupdesc = BuildDescFromLists(tf->colnames,
145  tf->coltypes,
146  tf->coltypmods,
147  tf->colcollations);
148  /* and the corresponding scan slot */
149  ExecInitScanTupleSlot(estate, &scanstate->ss, tupdesc,
151 
152  /*
153  * Initialize result type and projection.
154  */
155  ExecInitResultTypeTL(&scanstate->ss.ps);
156  ExecAssignScanProjectionInfo(&scanstate->ss);
157 
158  /*
159  * initialize child expressions
160  */
161  scanstate->ss.ps.qual =
162  ExecInitQual(node->scan.plan.qual, &scanstate->ss.ps);
163 
164  /* Only XMLTABLE is supported currently */
165  scanstate->routine = &XmlTableRoutine;
166 
167  scanstate->perTableCxt =
169  "TableFunc per value context",
171  scanstate->opaque = NULL; /* initialized at runtime */
172 
173  scanstate->ns_names = tf->ns_names;
174 
175  scanstate->ns_uris =
176  ExecInitExprList(tf->ns_uris, (PlanState *) scanstate);
177  scanstate->docexpr =
178  ExecInitExpr((Expr *) tf->docexpr, (PlanState *) scanstate);
179  scanstate->rowexpr =
180  ExecInitExpr((Expr *) tf->rowexpr, (PlanState *) scanstate);
181  scanstate->colexprs =
182  ExecInitExprList(tf->colexprs, (PlanState *) scanstate);
183  scanstate->coldefexprs =
184  ExecInitExprList(tf->coldefexprs, (PlanState *) scanstate);
185 
186  scanstate->notnulls = tf->notnulls;
187 
188  /* these are allocated now and initialized later */
189  scanstate->in_functions = palloc(sizeof(FmgrInfo) * tupdesc->natts);
190  scanstate->typioparams = palloc(sizeof(Oid) * tupdesc->natts);
191 
192  /*
193  * Fill in the necessary fmgr infos.
194  */
195  for (i = 0; i < tupdesc->natts; i++)
196  {
197  Oid in_funcid;
198 
200  &in_funcid, &scanstate->typioparams[i]);
201  fmgr_info(in_funcid, &scanstate->in_functions[i]);
202  }
203 
204  return scanstate;
205 }
206 
207 /* ----------------------------------------------------------------
208  * ExecEndTableFuncscan
209  *
210  * frees any storage allocated through C routines.
211  * ----------------------------------------------------------------
212  */
213 void
215 {
216  /*
217  * Free the exprcontext
218  */
219  ExecFreeExprContext(&node->ss.ps);
220 
221  /*
222  * clean out the tuple table
223  */
224  if (node->ss.ps.ps_ResultTupleSlot)
227 
228  /*
229  * Release tuplestore resources
230  */
231  if (node->tupstore != NULL)
232  tuplestore_end(node->tupstore);
233  node->tupstore = NULL;
234 }
235 
236 /* ----------------------------------------------------------------
237  * ExecReScanTableFuncscan
238  *
239  * Rescans the relation.
240  * ----------------------------------------------------------------
241  */
242 void
244 {
245  Bitmapset *chgparam = node->ss.ps.chgParam;
246 
247  if (node->ss.ps.ps_ResultTupleSlot)
249  ExecScanReScan(&node->ss);
250 
251  /*
252  * Recompute when parameters are changed.
253  */
254  if (chgparam)
255  {
256  if (node->tupstore != NULL)
257  {
258  tuplestore_end(node->tupstore);
259  node->tupstore = NULL;
260  }
261  }
262 
263  if (node->tupstore != NULL)
265 }
266 
267 /* ----------------------------------------------------------------
268  * tfuncFetchRows
269  *
270  * Read rows from a TableFunc producer
271  * ----------------------------------------------------------------
272  */
273 static void
275 {
276  const TableFuncRoutine *routine = tstate->routine;
277  MemoryContext oldcxt;
278  Datum value;
279  bool isnull;
280 
281  Assert(tstate->opaque == NULL);
282 
283  /* build tuplestore for the result */
284  oldcxt = MemoryContextSwitchTo(econtext->ecxt_per_query_memory);
285  tstate->tupstore = tuplestore_begin_heap(false, false, work_mem);
286 
287  /*
288  * Each call to fetch a new set of rows - of which there may be very many
289  * if XMLTABLE is being used in a lateral join - will allocate a possibly
290  * substantial amount of memory, so we cannot use the per-query context
291  * here. perTableCxt now serves the same function as "argcontext" does in
292  * FunctionScan - a place to store per-one-call (i.e. one result table)
293  * lifetime data (as opposed to per-query or per-result-tuple).
294  */
296 
297  PG_TRY();
298  {
299  routine->InitOpaque(tstate,
301 
302  /*
303  * If evaluating the document expression returns NULL, the table
304  * expression is empty and we return immediately.
305  */
306  value = ExecEvalExpr(tstate->docexpr, econtext, &isnull);
307 
308  if (!isnull)
309  {
310  /* otherwise, pass the document value to the table builder */
311  tfuncInitialize(tstate, econtext, value);
312 
313  /* initialize ordinality counter */
314  tstate->ordinal = 1;
315 
316  /* Load all rows into the tuplestore, and we're done */
317  tfuncLoadRows(tstate, econtext);
318  }
319  }
320  PG_CATCH();
321  {
322  if (tstate->opaque != NULL)
323  routine->DestroyOpaque(tstate);
324  PG_RE_THROW();
325  }
326  PG_END_TRY();
327 
328  /* clean up and return to original memory context */
329 
330  if (tstate->opaque != NULL)
331  {
332  routine->DestroyOpaque(tstate);
333  tstate->opaque = NULL;
334  }
335 
336  MemoryContextSwitchTo(oldcxt);
338 }
339 
340 /*
341  * Fill in namespace declarations, the row filter, and column filters in a
342  * table expression builder context.
343  */
344 static void
346 {
347  const TableFuncRoutine *routine = tstate->routine;
348  TupleDesc tupdesc;
349  ListCell *lc1,
350  *lc2;
351  bool isnull;
352  int colno;
353  Datum value;
354  int ordinalitycol =
355  ((TableFuncScan *) (tstate->ss.ps.plan))->tablefunc->ordinalitycol;
356 
357  /*
358  * Install the document as a possibly-toasted Datum into the tablefunc
359  * context.
360  */
361  routine->SetDocument(tstate, doc);
362 
363  /* Evaluate namespace specifications */
364  forboth(lc1, tstate->ns_uris, lc2, tstate->ns_names)
365  {
366  ExprState *expr = (ExprState *) lfirst(lc1);
367  Value *ns_node = (Value *) lfirst(lc2);
368  char *ns_uri;
369  char *ns_name;
370 
371  value = ExecEvalExpr((ExprState *) expr, econtext, &isnull);
372  if (isnull)
373  ereport(ERROR,
374  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
375  errmsg("namespace URI must not be null")));
376  ns_uri = TextDatumGetCString(value);
377 
378  /* DEFAULT is passed down to SetNamespace as NULL */
379  ns_name = ns_node ? strVal(ns_node) : NULL;
380 
381  routine->SetNamespace(tstate, ns_name, ns_uri);
382  }
383 
384  /* Install the row filter expression into the table builder context */
385  value = ExecEvalExpr(tstate->rowexpr, econtext, &isnull);
386  if (isnull)
387  ereport(ERROR,
388  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
389  errmsg("row filter expression must not be null")));
390 
391  routine->SetRowFilter(tstate, TextDatumGetCString(value));
392 
393  /*
394  * Install the column filter expressions into the table builder context.
395  * If an expression is given, use that; otherwise the column name itself
396  * is the column filter.
397  */
398  colno = 0;
399  tupdesc = tstate->ss.ss_ScanTupleSlot->tts_tupleDescriptor;
400  foreach(lc1, tstate->colexprs)
401  {
402  char *colfilter;
403  Form_pg_attribute att = TupleDescAttr(tupdesc, colno);
404 
405  if (colno != ordinalitycol)
406  {
407  ExprState *colexpr = lfirst(lc1);
408 
409  if (colexpr != NULL)
410  {
411  value = ExecEvalExpr(colexpr, econtext, &isnull);
412  if (isnull)
413  ereport(ERROR,
414  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
415  errmsg("column filter expression must not be null"),
416  errdetail("Filter for column \"%s\" is null.",
417  NameStr(att->attname))));
418  colfilter = TextDatumGetCString(value);
419  }
420  else
421  colfilter = NameStr(att->attname);
422 
423  routine->SetColumnFilter(tstate, colfilter, colno);
424  }
425 
426  colno++;
427  }
428 }
429 
430 /*
431  * Load all the rows from the TableFunc table builder into a tuplestore.
432  */
433 static void
435 {
436  const TableFuncRoutine *routine = tstate->routine;
437  TupleTableSlot *slot = tstate->ss.ss_ScanTupleSlot;
438  TupleDesc tupdesc = slot->tts_tupleDescriptor;
439  Datum *values = slot->tts_values;
440  bool *nulls = slot->tts_isnull;
441  int natts = tupdesc->natts;
442  MemoryContext oldcxt;
443  int ordinalitycol;
444 
445  ordinalitycol =
446  ((TableFuncScan *) (tstate->ss.ps.plan))->tablefunc->ordinalitycol;
447 
448  /*
449  * We need a short-lived memory context that we can clean up each time
450  * around the loop, to avoid wasting space. Our default per-tuple context
451  * is fine for the job, since we won't have used it for anything yet in
452  * this tuple cycle.
453  */
454  oldcxt = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
455 
456  /*
457  * Keep requesting rows from the table builder until there aren't any.
458  */
459  while (routine->FetchRow(tstate))
460  {
461  ListCell *cell = list_head(tstate->coldefexprs);
462  int colno;
463 
465 
467 
468  /*
469  * Obtain the value of each column for this row, installing them into
470  * the slot; then add the tuple to the tuplestore.
471  */
472  for (colno = 0; colno < natts; colno++)
473  {
474  Form_pg_attribute att = TupleDescAttr(tupdesc, colno);
475 
476  if (colno == ordinalitycol)
477  {
478  /* Fast path for ordinality column */
479  values[colno] = Int32GetDatum(tstate->ordinal++);
480  nulls[colno] = false;
481  }
482  else
483  {
484  bool isnull;
485 
486  values[colno] = routine->GetValue(tstate,
487  colno,
488  att->atttypid,
489  att->atttypmod,
490  &isnull);
491 
492  /* No value? Evaluate and apply the default, if any */
493  if (isnull && cell != NULL)
494  {
495  ExprState *coldefexpr = (ExprState *) lfirst(cell);
496 
497  if (coldefexpr != NULL)
498  values[colno] = ExecEvalExpr(coldefexpr, econtext,
499  &isnull);
500  }
501 
502  /* Verify a possible NOT NULL constraint */
503  if (isnull && bms_is_member(colno, tstate->notnulls))
504  ereport(ERROR,
505  (errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
506  errmsg("null is not allowed in column \"%s\"",
507  NameStr(att->attname))));
508 
509  nulls[colno] = isnull;
510  }
511 
512  /* advance list of default expressions */
513  if (cell != NULL)
514  cell = lnext(tstate->coldefexprs, cell);
515  }
516 
517  tuplestore_putvalues(tstate->tupstore, tupdesc, values, nulls);
518 
520  }
521 
522  MemoryContextSwitchTo(oldcxt);
523 }
void tuplestore_putvalues(Tuplestorestate *state, TupleDesc tdesc, Datum *values, bool *isnull)
Definition: tuplestore.c:750
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#define strVal(v)
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