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file_fdw.c
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1 /*-------------------------------------------------------------------------
2  *
3  * file_fdw.c
4  * foreign-data wrapper for server-side flat files (or programs).
5  *
6  * Copyright (c) 2010-2019, PostgreSQL Global Development Group
7  *
8  * IDENTIFICATION
9  * contrib/file_fdw/file_fdw.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 #include "postgres.h"
14 
15 #include <sys/stat.h>
16 #include <unistd.h>
17 
18 #include "access/htup_details.h"
19 #include "access/reloptions.h"
20 #include "access/sysattr.h"
21 #include "access/table.h"
22 #include "catalog/pg_authid.h"
24 #include "commands/copy.h"
25 #include "commands/defrem.h"
26 #include "commands/explain.h"
27 #include "commands/vacuum.h"
28 #include "foreign/fdwapi.h"
29 #include "foreign/foreign.h"
30 #include "miscadmin.h"
31 #include "nodes/makefuncs.h"
32 #include "optimizer/optimizer.h"
33 #include "optimizer/pathnode.h"
34 #include "optimizer/planmain.h"
35 #include "optimizer/restrictinfo.h"
36 #include "utils/memutils.h"
37 #include "utils/rel.h"
38 #include "utils/sampling.h"
39 
41 
42 /*
43  * Describes the valid options for objects that use this wrapper.
44  */
46 {
47  const char *optname;
48  Oid optcontext; /* Oid of catalog in which option may appear */
49 };
50 
51 /*
52  * Valid options for file_fdw.
53  * These options are based on the options for the COPY FROM command.
54  * But note that force_not_null and force_null are handled as boolean options
55  * attached to a column, not as table options.
56  *
57  * Note: If you are adding new option for user mapping, you need to modify
58  * fileGetOptions(), which currently doesn't bother to look at user mappings.
59  */
60 static const struct FileFdwOption valid_options[] = {
61  /* Data source options */
62  {"filename", ForeignTableRelationId},
63  {"program", ForeignTableRelationId},
64 
65  /* Format options */
66  /* oids option is not supported */
67  {"format", ForeignTableRelationId},
68  {"header", ForeignTableRelationId},
69  {"delimiter", ForeignTableRelationId},
70  {"quote", ForeignTableRelationId},
71  {"escape", ForeignTableRelationId},
72  {"null", ForeignTableRelationId},
73  {"encoding", ForeignTableRelationId},
74  {"force_not_null", AttributeRelationId},
75  {"force_null", AttributeRelationId},
76 
77  /*
78  * force_quote is not supported by file_fdw because it's for COPY TO.
79  */
80 
81  /* Sentinel */
82  {NULL, InvalidOid}
83 };
84 
85 /*
86  * FDW-specific information for RelOptInfo.fdw_private.
87  */
88 typedef struct FileFdwPlanState
89 {
90  char *filename; /* file or program to read from */
91  bool is_program; /* true if filename represents an OS command */
92  List *options; /* merged COPY options, excluding filename and
93  * is_program */
94  BlockNumber pages; /* estimate of file's physical size */
95  double ntuples; /* estimate of number of data rows */
97 
98 /*
99  * FDW-specific information for ForeignScanState.fdw_state.
100  */
101 typedef struct FileFdwExecutionState
102 {
103  char *filename; /* file or program to read from */
104  bool is_program; /* true if filename represents an OS command */
105  List *options; /* merged COPY options, excluding filename and
106  * is_program */
107  CopyState cstate; /* COPY execution state */
109 
110 /*
111  * SQL functions
112  */
115 
116 /*
117  * FDW callback routines
118  */
119 static void fileGetForeignRelSize(PlannerInfo *root,
120  RelOptInfo *baserel,
121  Oid foreigntableid);
122 static void fileGetForeignPaths(PlannerInfo *root,
123  RelOptInfo *baserel,
124  Oid foreigntableid);
126  RelOptInfo *baserel,
127  Oid foreigntableid,
128  ForeignPath *best_path,
129  List *tlist,
130  List *scan_clauses,
131  Plan *outer_plan);
133 static void fileBeginForeignScan(ForeignScanState *node, int eflags);
135 static void fileReScanForeignScan(ForeignScanState *node);
136 static void fileEndForeignScan(ForeignScanState *node);
137 static bool fileAnalyzeForeignTable(Relation relation,
138  AcquireSampleRowsFunc *func,
139  BlockNumber *totalpages);
141  RangeTblEntry *rte);
142 
143 /*
144  * Helper functions
145  */
146 static bool is_valid_option(const char *option, Oid context);
147 static void fileGetOptions(Oid foreigntableid,
148  char **filename,
149  bool *is_program,
150  List **other_options);
152 static bool check_selective_binary_conversion(RelOptInfo *baserel,
153  Oid foreigntableid,
154  List **columns);
155 static void estimate_size(PlannerInfo *root, RelOptInfo *baserel,
156  FileFdwPlanState *fdw_private);
157 static void estimate_costs(PlannerInfo *root, RelOptInfo *baserel,
158  FileFdwPlanState *fdw_private,
159  Cost *startup_cost, Cost *total_cost);
160 static int file_acquire_sample_rows(Relation onerel, int elevel,
161  HeapTuple *rows, int targrows,
162  double *totalrows, double *totaldeadrows);
163 
164 
165 /*
166  * Foreign-data wrapper handler function: return a struct with pointers
167  * to my callback routines.
168  */
169 Datum
171 {
172  FdwRoutine *fdwroutine = makeNode(FdwRoutine);
173 
175  fdwroutine->GetForeignPaths = fileGetForeignPaths;
176  fdwroutine->GetForeignPlan = fileGetForeignPlan;
181  fdwroutine->EndForeignScan = fileEndForeignScan;
184 
185  PG_RETURN_POINTER(fdwroutine);
186 }
187 
188 /*
189  * Validate the generic options given to a FOREIGN DATA WRAPPER, SERVER,
190  * USER MAPPING or FOREIGN TABLE that uses file_fdw.
191  *
192  * Raise an ERROR if the option or its value is considered invalid.
193  */
194 Datum
196 {
197  List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
198  Oid catalog = PG_GETARG_OID(1);
199  char *filename = NULL;
200  DefElem *force_not_null = NULL;
201  DefElem *force_null = NULL;
202  List *other_options = NIL;
203  ListCell *cell;
204 
205  /*
206  * Check that only options supported by file_fdw, and allowed for the
207  * current object type, are given.
208  */
209  foreach(cell, options_list)
210  {
211  DefElem *def = (DefElem *) lfirst(cell);
212 
213  if (!is_valid_option(def->defname, catalog))
214  {
215  const struct FileFdwOption *opt;
217 
218  /*
219  * Unknown option specified, complain about it. Provide a hint
220  * with list of valid options for the object.
221  */
222  initStringInfo(&buf);
223  for (opt = valid_options; opt->optname; opt++)
224  {
225  if (catalog == opt->optcontext)
226  appendStringInfo(&buf, "%s%s", (buf.len > 0) ? ", " : "",
227  opt->optname);
228  }
229 
230  ereport(ERROR,
231  (errcode(ERRCODE_FDW_INVALID_OPTION_NAME),
232  errmsg("invalid option \"%s\"", def->defname),
233  buf.len > 0
234  ? errhint("Valid options in this context are: %s",
235  buf.data)
236  : errhint("There are no valid options in this context.")));
237  }
238 
239  /*
240  * Separate out filename, program, and column-specific options, since
241  * ProcessCopyOptions won't accept them.
242  */
243  if (strcmp(def->defname, "filename") == 0 ||
244  strcmp(def->defname, "program") == 0)
245  {
246  if (filename)
247  ereport(ERROR,
248  (errcode(ERRCODE_SYNTAX_ERROR),
249  errmsg("conflicting or redundant options")));
250 
251  /*
252  * Check permissions for changing which file or program is used by
253  * the file_fdw.
254  *
255  * Only members of the role 'pg_read_server_files' are allowed to
256  * set the 'filename' option of a file_fdw foreign table, while
257  * only members of the role 'pg_execute_server_program' are
258  * allowed to set the 'program' option. This is because we don't
259  * want regular users to be able to control which file gets read
260  * or which program gets executed.
261  *
262  * Putting this sort of permissions check in a validator is a bit
263  * of a crock, but there doesn't seem to be any other place that
264  * can enforce the check more cleanly.
265  *
266  * Note that the valid_options[] array disallows setting filename
267  * and program at any options level other than foreign table ---
268  * otherwise there'd still be a security hole.
269  */
270  if (strcmp(def->defname, "filename") == 0 &&
271  !is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_SERVER_FILES))
272  ereport(ERROR,
273  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
274  errmsg("only superuser or a member of the pg_read_server_files role may specify the filename option of a file_fdw foreign table")));
275 
276  if (strcmp(def->defname, "program") == 0 &&
277  !is_member_of_role(GetUserId(), DEFAULT_ROLE_EXECUTE_SERVER_PROGRAM))
278  ereport(ERROR,
279  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
280  errmsg("only superuser or a member of the pg_execute_server_program role may specify the program option of a file_fdw foreign table")));
281 
282  filename = defGetString(def);
283  }
284 
285  /*
286  * force_not_null is a boolean option; after validation we can discard
287  * it - it will be retrieved later in get_file_fdw_attribute_options()
288  */
289  else if (strcmp(def->defname, "force_not_null") == 0)
290  {
291  if (force_not_null)
292  ereport(ERROR,
293  (errcode(ERRCODE_SYNTAX_ERROR),
294  errmsg("conflicting or redundant options"),
295  errhint("Option \"force_not_null\" supplied more than once for a column.")));
296  force_not_null = def;
297  /* Don't care what the value is, as long as it's a legal boolean */
298  (void) defGetBoolean(def);
299  }
300  /* See comments for force_not_null above */
301  else if (strcmp(def->defname, "force_null") == 0)
302  {
303  if (force_null)
304  ereport(ERROR,
305  (errcode(ERRCODE_SYNTAX_ERROR),
306  errmsg("conflicting or redundant options"),
307  errhint("Option \"force_null\" supplied more than once for a column.")));
308  force_null = def;
309  (void) defGetBoolean(def);
310  }
311  else
312  other_options = lappend(other_options, def);
313  }
314 
315  /*
316  * Now apply the core COPY code's validation logic for more checks.
317  */
318  ProcessCopyOptions(NULL, NULL, true, other_options);
319 
320  /*
321  * Either filename or program option is required for file_fdw foreign
322  * tables.
323  */
324  if (catalog == ForeignTableRelationId && filename == NULL)
325  ereport(ERROR,
326  (errcode(ERRCODE_FDW_DYNAMIC_PARAMETER_VALUE_NEEDED),
327  errmsg("either filename or program is required for file_fdw foreign tables")));
328 
329  PG_RETURN_VOID();
330 }
331 
332 /*
333  * Check if the provided option is one of the valid options.
334  * context is the Oid of the catalog holding the object the option is for.
335  */
336 static bool
337 is_valid_option(const char *option, Oid context)
338 {
339  const struct FileFdwOption *opt;
340 
341  for (opt = valid_options; opt->optname; opt++)
342  {
343  if (context == opt->optcontext && strcmp(opt->optname, option) == 0)
344  return true;
345  }
346  return false;
347 }
348 
349 /*
350  * Fetch the options for a file_fdw foreign table.
351  *
352  * We have to separate out filename/program from the other options because
353  * those must not appear in the options list passed to the core COPY code.
354  */
355 static void
356 fileGetOptions(Oid foreigntableid,
357  char **filename, bool *is_program, List **other_options)
358 {
359  ForeignTable *table;
360  ForeignServer *server;
361  ForeignDataWrapper *wrapper;
362  List *options;
363  ListCell *lc;
364 
365  /*
366  * Extract options from FDW objects. We ignore user mappings because
367  * file_fdw doesn't have any options that can be specified there.
368  *
369  * (XXX Actually, given the current contents of valid_options[], there's
370  * no point in examining anything except the foreign table's own options.
371  * Simplify?)
372  */
373  table = GetForeignTable(foreigntableid);
374  server = GetForeignServer(table->serverid);
375  wrapper = GetForeignDataWrapper(server->fdwid);
376 
377  options = NIL;
378  options = list_concat(options, wrapper->options);
379  options = list_concat(options, server->options);
380  options = list_concat(options, table->options);
381  options = list_concat(options, get_file_fdw_attribute_options(foreigntableid));
382 
383  /*
384  * Separate out the filename or program option (we assume there is only
385  * one).
386  */
387  *filename = NULL;
388  *is_program = false;
389  foreach(lc, options)
390  {
391  DefElem *def = (DefElem *) lfirst(lc);
392 
393  if (strcmp(def->defname, "filename") == 0)
394  {
395  *filename = defGetString(def);
396  options = foreach_delete_current(options, lc);
397  break;
398  }
399  else if (strcmp(def->defname, "program") == 0)
400  {
401  *filename = defGetString(def);
402  *is_program = true;
403  options = foreach_delete_current(options, lc);
404  break;
405  }
406  }
407 
408  /*
409  * The validator should have checked that filename or program was included
410  * in the options, but check again, just in case.
411  */
412  if (*filename == NULL)
413  elog(ERROR, "either filename or program is required for file_fdw foreign tables");
414 
415  *other_options = options;
416 }
417 
418 /*
419  * Retrieve per-column generic options from pg_attribute and construct a list
420  * of DefElems representing them.
421  *
422  * At the moment we only have "force_not_null", and "force_null",
423  * which should each be combined into a single DefElem listing all such
424  * columns, since that's what COPY expects.
425  */
426 static List *
428 {
429  Relation rel;
430  TupleDesc tupleDesc;
431  AttrNumber natts;
433  List *fnncolumns = NIL;
434  List *fncolumns = NIL;
435 
436  List *options = NIL;
437 
438  rel = table_open(relid, AccessShareLock);
439  tupleDesc = RelationGetDescr(rel);
440  natts = tupleDesc->natts;
441 
442  /* Retrieve FDW options for all user-defined attributes. */
443  for (attnum = 1; attnum <= natts; attnum++)
444  {
445  Form_pg_attribute attr = TupleDescAttr(tupleDesc, attnum - 1);
446  List *options;
447  ListCell *lc;
448 
449  /* Skip dropped attributes. */
450  if (attr->attisdropped)
451  continue;
452 
453  options = GetForeignColumnOptions(relid, attnum);
454  foreach(lc, options)
455  {
456  DefElem *def = (DefElem *) lfirst(lc);
457 
458  if (strcmp(def->defname, "force_not_null") == 0)
459  {
460  if (defGetBoolean(def))
461  {
462  char *attname = pstrdup(NameStr(attr->attname));
463 
464  fnncolumns = lappend(fnncolumns, makeString(attname));
465  }
466  }
467  else if (strcmp(def->defname, "force_null") == 0)
468  {
469  if (defGetBoolean(def))
470  {
471  char *attname = pstrdup(NameStr(attr->attname));
472 
473  fncolumns = lappend(fncolumns, makeString(attname));
474  }
475  }
476  /* maybe in future handle other options here */
477  }
478  }
479 
481 
482  /*
483  * Return DefElem only when some column(s) have force_not_null /
484  * force_null options set
485  */
486  if (fnncolumns != NIL)
487  options = lappend(options, makeDefElem("force_not_null", (Node *) fnncolumns, -1));
488 
489  if (fncolumns != NIL)
490  options = lappend(options, makeDefElem("force_null", (Node *) fncolumns, -1));
491 
492  return options;
493 }
494 
495 /*
496  * fileGetForeignRelSize
497  * Obtain relation size estimates for a foreign table
498  */
499 static void
501  RelOptInfo *baserel,
502  Oid foreigntableid)
503 {
504  FileFdwPlanState *fdw_private;
505 
506  /*
507  * Fetch options. We only need filename (or program) at this point, but
508  * we might as well get everything and not need to re-fetch it later in
509  * planning.
510  */
511  fdw_private = (FileFdwPlanState *) palloc(sizeof(FileFdwPlanState));
512  fileGetOptions(foreigntableid,
513  &fdw_private->filename,
514  &fdw_private->is_program,
515  &fdw_private->options);
516  baserel->fdw_private = (void *) fdw_private;
517 
518  /* Estimate relation size */
519  estimate_size(root, baserel, fdw_private);
520 }
521 
522 /*
523  * fileGetForeignPaths
524  * Create possible access paths for a scan on the foreign table
525  *
526  * Currently we don't support any push-down feature, so there is only one
527  * possible access path, which simply returns all records in the order in
528  * the data file.
529  */
530 static void
532  RelOptInfo *baserel,
533  Oid foreigntableid)
534 {
535  FileFdwPlanState *fdw_private = (FileFdwPlanState *) baserel->fdw_private;
536  Cost startup_cost;
537  Cost total_cost;
538  List *columns;
539  List *coptions = NIL;
540 
541  /* Decide whether to selectively perform binary conversion */
543  foreigntableid,
544  &columns))
545  coptions = list_make1(makeDefElem("convert_selectively",
546  (Node *) columns, -1));
547 
548  /* Estimate costs */
549  estimate_costs(root, baserel, fdw_private,
550  &startup_cost, &total_cost);
551 
552  /*
553  * Create a ForeignPath node and add it as only possible path. We use the
554  * fdw_private list of the path to carry the convert_selectively option;
555  * it will be propagated into the fdw_private list of the Plan node.
556  *
557  * We don't support pushing join clauses into the quals of this path, but
558  * it could still have required parameterization due to LATERAL refs in
559  * its tlist.
560  */
561  add_path(baserel, (Path *)
562  create_foreignscan_path(root, baserel,
563  NULL, /* default pathtarget */
564  baserel->rows,
565  startup_cost,
566  total_cost,
567  NIL, /* no pathkeys */
568  baserel->lateral_relids,
569  NULL, /* no extra plan */
570  coptions));
571 
572  /*
573  * If data file was sorted, and we knew it somehow, we could insert
574  * appropriate pathkeys into the ForeignPath node to tell the planner
575  * that.
576  */
577 }
578 
579 /*
580  * fileGetForeignPlan
581  * Create a ForeignScan plan node for scanning the foreign table
582  */
583 static ForeignScan *
585  RelOptInfo *baserel,
586  Oid foreigntableid,
587  ForeignPath *best_path,
588  List *tlist,
589  List *scan_clauses,
590  Plan *outer_plan)
591 {
592  Index scan_relid = baserel->relid;
593 
594  /*
595  * We have no native ability to evaluate restriction clauses, so we just
596  * put all the scan_clauses into the plan node's qual list for the
597  * executor to check. So all we have to do here is strip RestrictInfo
598  * nodes from the clauses and ignore pseudoconstants (which will be
599  * handled elsewhere).
600  */
601  scan_clauses = extract_actual_clauses(scan_clauses, false);
602 
603  /* Create the ForeignScan node */
604  return make_foreignscan(tlist,
605  scan_clauses,
606  scan_relid,
607  NIL, /* no expressions to evaluate */
608  best_path->fdw_private,
609  NIL, /* no custom tlist */
610  NIL, /* no remote quals */
611  outer_plan);
612 }
613 
614 /*
615  * fileExplainForeignScan
616  * Produce extra output for EXPLAIN
617  */
618 static void
620 {
621  char *filename;
622  bool is_program;
623  List *options;
624 
625  /* Fetch options --- we only need filename and is_program at this point */
627  &filename, &is_program, &options);
628 
629  if (is_program)
630  ExplainPropertyText("Foreign Program", filename, es);
631  else
632  ExplainPropertyText("Foreign File", filename, es);
633 
634  /* Suppress file size if we're not showing cost details */
635  if (es->costs)
636  {
637  struct stat stat_buf;
638 
639  if (!is_program &&
640  stat(filename, &stat_buf) == 0)
641  ExplainPropertyInteger("Foreign File Size", "b",
642  (int64) stat_buf.st_size, es);
643  }
644 }
645 
646 /*
647  * fileBeginForeignScan
648  * Initiate access to the file by creating CopyState
649  */
650 static void
652 {
653  ForeignScan *plan = (ForeignScan *) node->ss.ps.plan;
654  char *filename;
655  bool is_program;
656  List *options;
657  CopyState cstate;
658  FileFdwExecutionState *festate;
659 
660  /*
661  * Do nothing in EXPLAIN (no ANALYZE) case. node->fdw_state stays NULL.
662  */
663  if (eflags & EXEC_FLAG_EXPLAIN_ONLY)
664  return;
665 
666  /* Fetch options of foreign table */
668  &filename, &is_program, &options);
669 
670  /* Add any options from the plan (currently only convert_selectively) */
672 
673  /*
674  * Create CopyState from FDW options. We always acquire all columns, so
675  * as to match the expected ScanTupleSlot signature.
676  */
677  cstate = BeginCopyFrom(NULL,
678  node->ss.ss_currentRelation,
679  filename,
680  is_program,
681  NULL,
682  NIL,
683  options);
684 
685  /*
686  * Save state in node->fdw_state. We must save enough information to call
687  * BeginCopyFrom() again.
688  */
689  festate = (FileFdwExecutionState *) palloc(sizeof(FileFdwExecutionState));
690  festate->filename = filename;
691  festate->is_program = is_program;
692  festate->options = options;
693  festate->cstate = cstate;
694 
695  node->fdw_state = (void *) festate;
696 }
697 
698 /*
699  * fileIterateForeignScan
700  * Read next record from the data file and store it into the
701  * ScanTupleSlot as a virtual tuple
702  */
703 static TupleTableSlot *
705 {
707  TupleTableSlot *slot = node->ss.ss_ScanTupleSlot;
708  bool found;
709  ErrorContextCallback errcallback;
710 
711  /* Set up callback to identify error line number. */
712  errcallback.callback = CopyFromErrorCallback;
713  errcallback.arg = (void *) festate->cstate;
714  errcallback.previous = error_context_stack;
715  error_context_stack = &errcallback;
716 
717  /*
718  * The protocol for loading a virtual tuple into a slot is first
719  * ExecClearTuple, then fill the values/isnull arrays, then
720  * ExecStoreVirtualTuple. If we don't find another row in the file, we
721  * just skip the last step, leaving the slot empty as required.
722  *
723  * We can pass ExprContext = NULL because we read all columns from the
724  * file, so no need to evaluate default expressions.
725  *
726  * We can also pass tupleOid = NULL because we don't allow oids for
727  * foreign tables.
728  */
729  ExecClearTuple(slot);
730  found = NextCopyFrom(festate->cstate, NULL,
731  slot->tts_values, slot->tts_isnull);
732  if (found)
733  ExecStoreVirtualTuple(slot);
734 
735  /* Remove error callback. */
736  error_context_stack = errcallback.previous;
737 
738  return slot;
739 }
740 
741 /*
742  * fileReScanForeignScan
743  * Rescan table, possibly with new parameters
744  */
745 static void
747 {
749 
750  EndCopyFrom(festate->cstate);
751 
752  festate->cstate = BeginCopyFrom(NULL,
753  node->ss.ss_currentRelation,
754  festate->filename,
755  festate->is_program,
756  NULL,
757  NIL,
758  festate->options);
759 }
760 
761 /*
762  * fileEndForeignScan
763  * Finish scanning foreign table and dispose objects used for this scan
764  */
765 static void
767 {
769 
770  /* if festate is NULL, we are in EXPLAIN; nothing to do */
771  if (festate)
772  EndCopyFrom(festate->cstate);
773 }
774 
775 /*
776  * fileAnalyzeForeignTable
777  * Test whether analyzing this foreign table is supported
778  */
779 static bool
781  AcquireSampleRowsFunc *func,
782  BlockNumber *totalpages)
783 {
784  char *filename;
785  bool is_program;
786  List *options;
787  struct stat stat_buf;
788 
789  /* Fetch options of foreign table */
790  fileGetOptions(RelationGetRelid(relation), &filename, &is_program, &options);
791 
792  /*
793  * If this is a program instead of a file, just return false to skip
794  * analyzing the table. We could run the program and collect stats on
795  * whatever it currently returns, but it seems likely that in such cases
796  * the output would be too volatile for the stats to be useful. Maybe
797  * there should be an option to enable doing this?
798  */
799  if (is_program)
800  return false;
801 
802  /*
803  * Get size of the file. (XXX if we fail here, would it be better to just
804  * return false to skip analyzing the table?)
805  */
806  if (stat(filename, &stat_buf) < 0)
807  ereport(ERROR,
809  errmsg("could not stat file \"%s\": %m",
810  filename)));
811 
812  /*
813  * Convert size to pages. Must return at least 1 so that we can tell
814  * later on that pg_class.relpages is not default.
815  */
816  *totalpages = (stat_buf.st_size + (BLCKSZ - 1)) / BLCKSZ;
817  if (*totalpages < 1)
818  *totalpages = 1;
819 
820  *func = file_acquire_sample_rows;
821 
822  return true;
823 }
824 
825 /*
826  * fileIsForeignScanParallelSafe
827  * Reading a file, or external program, in a parallel worker should work
828  * just the same as reading it in the leader, so mark scans safe.
829  */
830 static bool
832  RangeTblEntry *rte)
833 {
834  return true;
835 }
836 
837 /*
838  * check_selective_binary_conversion
839  *
840  * Check to see if it's useful to convert only a subset of the file's columns
841  * to binary. If so, construct a list of the column names to be converted,
842  * return that at *columns, and return true. (Note that it's possible to
843  * determine that no columns need be converted, for instance with a COUNT(*)
844  * query. So we can't use returning a NIL list to indicate failure.)
845  */
846 static bool
848  Oid foreigntableid,
849  List **columns)
850 {
851  ForeignTable *table;
852  ListCell *lc;
853  Relation rel;
854  TupleDesc tupleDesc;
856  Bitmapset *attrs_used = NULL;
857  bool has_wholerow = false;
858  int numattrs;
859  int i;
860 
861  *columns = NIL; /* default result */
862 
863  /*
864  * Check format of the file. If binary format, this is irrelevant.
865  */
866  table = GetForeignTable(foreigntableid);
867  foreach(lc, table->options)
868  {
869  DefElem *def = (DefElem *) lfirst(lc);
870 
871  if (strcmp(def->defname, "format") == 0)
872  {
873  char *format = defGetString(def);
874 
875  if (strcmp(format, "binary") == 0)
876  return false;
877  break;
878  }
879  }
880 
881  /* Collect all the attributes needed for joins or final output. */
882  pull_varattnos((Node *) baserel->reltarget->exprs, baserel->relid,
883  &attrs_used);
884 
885  /* Add all the attributes used by restriction clauses. */
886  foreach(lc, baserel->baserestrictinfo)
887  {
888  RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
889 
890  pull_varattnos((Node *) rinfo->clause, baserel->relid,
891  &attrs_used);
892  }
893 
894  /* Convert attribute numbers to column names. */
895  rel = table_open(foreigntableid, AccessShareLock);
896  tupleDesc = RelationGetDescr(rel);
897 
898  while ((attnum = bms_first_member(attrs_used)) >= 0)
899  {
900  /* Adjust for system attributes. */
902 
903  if (attnum == 0)
904  {
905  has_wholerow = true;
906  break;
907  }
908 
909  /* Ignore system attributes. */
910  if (attnum < 0)
911  continue;
912 
913  /* Get user attributes. */
914  if (attnum > 0)
915  {
916  Form_pg_attribute attr = TupleDescAttr(tupleDesc, attnum - 1);
917  char *attname = NameStr(attr->attname);
918 
919  /* Skip dropped attributes (probably shouldn't see any here). */
920  if (attr->attisdropped)
921  continue;
922 
923  /*
924  * Skip generated columns (COPY won't accept them in the column
925  * list)
926  */
927  if (attr->attgenerated)
928  continue;
929  *columns = lappend(*columns, makeString(pstrdup(attname)));
930  }
931  }
932 
933  /* Count non-dropped user attributes while we have the tupdesc. */
934  numattrs = 0;
935  for (i = 0; i < tupleDesc->natts; i++)
936  {
937  Form_pg_attribute attr = TupleDescAttr(tupleDesc, i);
938 
939  if (attr->attisdropped)
940  continue;
941  numattrs++;
942  }
943 
945 
946  /* If there's a whole-row reference, fail: we need all the columns. */
947  if (has_wholerow)
948  {
949  *columns = NIL;
950  return false;
951  }
952 
953  /* If all the user attributes are needed, fail. */
954  if (numattrs == list_length(*columns))
955  {
956  *columns = NIL;
957  return false;
958  }
959 
960  return true;
961 }
962 
963 /*
964  * Estimate size of a foreign table.
965  *
966  * The main result is returned in baserel->rows. We also set
967  * fdw_private->pages and fdw_private->ntuples for later use in the cost
968  * calculation.
969  */
970 static void
972  FileFdwPlanState *fdw_private)
973 {
974  struct stat stat_buf;
975  BlockNumber pages;
976  double ntuples;
977  double nrows;
978 
979  /*
980  * Get size of the file. It might not be there at plan time, though, in
981  * which case we have to use a default estimate. We also have to fall
982  * back to the default if using a program as the input.
983  */
984  if (fdw_private->is_program || stat(fdw_private->filename, &stat_buf) < 0)
985  stat_buf.st_size = 10 * BLCKSZ;
986 
987  /*
988  * Convert size to pages for use in I/O cost estimate later.
989  */
990  pages = (stat_buf.st_size + (BLCKSZ - 1)) / BLCKSZ;
991  if (pages < 1)
992  pages = 1;
993  fdw_private->pages = pages;
994 
995  /*
996  * Estimate the number of tuples in the file.
997  */
998  if (baserel->pages > 0)
999  {
1000  /*
1001  * We have # of pages and # of tuples from pg_class (that is, from a
1002  * previous ANALYZE), so compute a tuples-per-page estimate and scale
1003  * that by the current file size.
1004  */
1005  double density;
1006 
1007  density = baserel->tuples / (double) baserel->pages;
1008  ntuples = clamp_row_est(density * (double) pages);
1009  }
1010  else
1011  {
1012  /*
1013  * Otherwise we have to fake it. We back into this estimate using the
1014  * planner's idea of the relation width; which is bogus if not all
1015  * columns are being read, not to mention that the text representation
1016  * of a row probably isn't the same size as its internal
1017  * representation. Possibly we could do something better, but the
1018  * real answer to anyone who complains is "ANALYZE" ...
1019  */
1020  int tuple_width;
1021 
1022  tuple_width = MAXALIGN(baserel->reltarget->width) +
1024  ntuples = clamp_row_est((double) stat_buf.st_size /
1025  (double) tuple_width);
1026  }
1027  fdw_private->ntuples = ntuples;
1028 
1029  /*
1030  * Now estimate the number of rows returned by the scan after applying the
1031  * baserestrictinfo quals.
1032  */
1033  nrows = ntuples *
1035  baserel->baserestrictinfo,
1036  0,
1037  JOIN_INNER,
1038  NULL);
1039 
1040  nrows = clamp_row_est(nrows);
1041 
1042  /* Save the output-rows estimate for the planner */
1043  baserel->rows = nrows;
1044 }
1045 
1046 /*
1047  * Estimate costs of scanning a foreign table.
1048  *
1049  * Results are returned in *startup_cost and *total_cost.
1050  */
1051 static void
1053  FileFdwPlanState *fdw_private,
1054  Cost *startup_cost, Cost *total_cost)
1055 {
1056  BlockNumber pages = fdw_private->pages;
1057  double ntuples = fdw_private->ntuples;
1058  Cost run_cost = 0;
1059  Cost cpu_per_tuple;
1060 
1061  /*
1062  * We estimate costs almost the same way as cost_seqscan(), thus assuming
1063  * that I/O costs are equivalent to a regular table file of the same size.
1064  * However, we take per-tuple CPU costs as 10x of a seqscan, to account
1065  * for the cost of parsing records.
1066  *
1067  * In the case of a program source, this calculation is even more divorced
1068  * from reality, but we have no good alternative; and it's not clear that
1069  * the numbers we produce here matter much anyway, since there's only one
1070  * access path for the rel.
1071  */
1072  run_cost += seq_page_cost * pages;
1073 
1074  *startup_cost = baserel->baserestrictcost.startup;
1075  cpu_per_tuple = cpu_tuple_cost * 10 + baserel->baserestrictcost.per_tuple;
1076  run_cost += cpu_per_tuple * ntuples;
1077  *total_cost = *startup_cost + run_cost;
1078 }
1079 
1080 /*
1081  * file_acquire_sample_rows -- acquire a random sample of rows from the table
1082  *
1083  * Selected rows are returned in the caller-allocated array rows[],
1084  * which must have at least targrows entries.
1085  * The actual number of rows selected is returned as the function result.
1086  * We also count the total number of rows in the file and return it into
1087  * *totalrows. Note that *totaldeadrows is always set to 0.
1088  *
1089  * Note that the returned list of rows is not always in order by physical
1090  * position in the file. Therefore, correlation estimates derived later
1091  * may be meaningless, but it's OK because we don't use the estimates
1092  * currently (the planner only pays attention to correlation for indexscans).
1093  */
1094 static int
1096  HeapTuple *rows, int targrows,
1097  double *totalrows, double *totaldeadrows)
1098 {
1099  int numrows = 0;
1100  double rowstoskip = -1; /* -1 means not set yet */
1101  ReservoirStateData rstate;
1102  TupleDesc tupDesc;
1103  Datum *values;
1104  bool *nulls;
1105  bool found;
1106  char *filename;
1107  bool is_program;
1108  List *options;
1109  CopyState cstate;
1110  ErrorContextCallback errcallback;
1111  MemoryContext oldcontext = CurrentMemoryContext;
1112  MemoryContext tupcontext;
1113 
1114  Assert(onerel);
1115  Assert(targrows > 0);
1116 
1117  tupDesc = RelationGetDescr(onerel);
1118  values = (Datum *) palloc(tupDesc->natts * sizeof(Datum));
1119  nulls = (bool *) palloc(tupDesc->natts * sizeof(bool));
1120 
1121  /* Fetch options of foreign table */
1122  fileGetOptions(RelationGetRelid(onerel), &filename, &is_program, &options);
1123 
1124  /*
1125  * Create CopyState from FDW options.
1126  */
1127  cstate = BeginCopyFrom(NULL, onerel, filename, is_program, NULL, NIL,
1128  options);
1129 
1130  /*
1131  * Use per-tuple memory context to prevent leak of memory used to read
1132  * rows from the file with Copy routines.
1133  */
1135  "file_fdw temporary context",
1137 
1138  /* Prepare for sampling rows */
1139  reservoir_init_selection_state(&rstate, targrows);
1140 
1141  /* Set up callback to identify error line number. */
1142  errcallback.callback = CopyFromErrorCallback;
1143  errcallback.arg = (void *) cstate;
1144  errcallback.previous = error_context_stack;
1145  error_context_stack = &errcallback;
1146 
1147  *totalrows = 0;
1148  *totaldeadrows = 0;
1149  for (;;)
1150  {
1151  /* Check for user-requested abort or sleep */
1153 
1154  /* Fetch next row */
1155  MemoryContextReset(tupcontext);
1156  MemoryContextSwitchTo(tupcontext);
1157 
1158  found = NextCopyFrom(cstate, NULL, values, nulls);
1159 
1160  MemoryContextSwitchTo(oldcontext);
1161 
1162  if (!found)
1163  break;
1164 
1165  /*
1166  * The first targrows sample rows are simply copied into the
1167  * reservoir. Then we start replacing tuples in the sample until we
1168  * reach the end of the relation. This algorithm is from Jeff Vitter's
1169  * paper (see more info in commands/analyze.c).
1170  */
1171  if (numrows < targrows)
1172  {
1173  rows[numrows++] = heap_form_tuple(tupDesc, values, nulls);
1174  }
1175  else
1176  {
1177  /*
1178  * t in Vitter's paper is the number of records already processed.
1179  * If we need to compute a new S value, we must use the
1180  * not-yet-incremented value of totalrows as t.
1181  */
1182  if (rowstoskip < 0)
1183  rowstoskip = reservoir_get_next_S(&rstate, *totalrows, targrows);
1184 
1185  if (rowstoskip <= 0)
1186  {
1187  /*
1188  * Found a suitable tuple, so save it, replacing one old tuple
1189  * at random
1190  */
1191  int k = (int) (targrows * sampler_random_fract(rstate.randstate));
1192 
1193  Assert(k >= 0 && k < targrows);
1194  heap_freetuple(rows[k]);
1195  rows[k] = heap_form_tuple(tupDesc, values, nulls);
1196  }
1197 
1198  rowstoskip -= 1;
1199  }
1200 
1201  *totalrows += 1;
1202  }
1203 
1204  /* Remove error callback. */
1205  error_context_stack = errcallback.previous;
1206 
1207  /* Clean up. */
1208  MemoryContextDelete(tupcontext);
1209 
1210  EndCopyFrom(cstate);
1211 
1212  pfree(values);
1213  pfree(nulls);
1214 
1215  /*
1216  * Emit some interesting relation info
1217  */
1218  ereport(elevel,
1219  (errmsg("\"%s\": file contains %.0f rows; "
1220  "%d rows in sample",
1221  RelationGetRelationName(onerel),
1222  *totalrows, numrows)));
1223 
1224  return numrows;
1225 }
GetForeignPlan_function GetForeignPlan
Definition: fdwapi.h:190
Value * makeString(char *str)
Definition: value.c:53
BeginForeignScan_function BeginForeignScan
Definition: fdwapi.h:191
#define PG_RETURN_POINTER(x)
Definition: fmgr.h:351
#define NIL
Definition: pg_list.h:65
ScanState ss
Definition: execnodes.h:1785
static bool fileIsForeignScanParallelSafe(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
Definition: file_fdw.c:831
#define SizeofHeapTupleHeader
Definition: htup_details.h:184
int bms_first_member(Bitmapset *a)
Definition: bitmapset.c:996
static List * get_file_fdw_attribute_options(Oid relid)
Definition: file_fdw.c:427
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:211
#define AllocSetContextCreate
Definition: memutils.h:170
Oid optcontext
Definition: file_fdw.c:48
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:133
int errhint(const char *fmt,...)
Definition: elog.c:974
static void fileEndForeignScan(ForeignScanState *node)
Definition: file_fdw.c:766
void ExplainPropertyInteger(const char *qlabel, const char *unit, int64 value, ExplainState *es)
Definition: explain.c:3584
static const struct FileFdwOption valid_options[]
Definition: file_fdw.c:60
void add_path(RelOptInfo *parent_rel, Path *new_path)
Definition: pathnode.c:423
ExplainForeignScan_function ExplainForeignScan
Definition: fdwapi.h:229
void CopyFromErrorCallback(void *arg)
Definition: copy.c:2239
BlockNumber pages
Definition: file_fdw.c:94
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:426
#define RelationGetDescr(relation)
Definition: rel.h:445
List * options
Definition: file_fdw.c:92
Oid GetUserId(void)
Definition: miscinit.c:380
AnalyzeForeignTable_function AnalyzeForeignTable
Definition: fdwapi.h:234
Datum file_fdw_handler(PG_FUNCTION_ARGS)
Definition: file_fdw.c:170
PG_MODULE_MAGIC
Definition: file_fdw.c:40
#define PG_GETARG_DATUM(n)
Definition: fmgr.h:263
#define TupleDescAttr(tupdesc, i)
Definition: tupdesc.h:92
CopyState BeginCopyFrom(ParseState *pstate, Relation rel, const char *filename, bool is_program, copy_data_source_cb data_source_cb, List *attnamelist, List *options)
Definition: copy.c:3387
char * pstrdup(const char *in)
Definition: mcxt.c:1186
double tuples
Definition: pathnodes.h:681
List * baserestrictinfo
Definition: pathnodes.h:703
List * fdw_private
Definition: plannodes.h:614
void ProcessCopyOptions(ParseState *pstate, CopyState cstate, bool is_from, List *options)
Definition: copy.c:1110
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
double sampler_random_fract(SamplerRandomState randstate)
Definition: sampling.c:238
#define AccessShareLock
Definition: lockdefs.h:36
Definition: nodes.h:525
List * list_concat(List *list1, const List *list2)
Definition: list.c:516
int errcode(int sqlerrcode)
Definition: elog.c:570
ForeignTable * GetForeignTable(Oid relid)
Definition: foreign.c:248
#define FirstLowInvalidHeapAttributeNumber
Definition: sysattr.h:27
TupleTableSlot * ss_ScanTupleSlot
Definition: execnodes.h:1334
void MemoryContextReset(MemoryContext context)
Definition: mcxt.c:136
uint32 BlockNumber
Definition: block.h:31
void reservoir_init_selection_state(ReservoirState rs, int n)
Definition: sampling.c:129
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
Relation ss_currentRelation
Definition: execnodes.h:1332
Datum file_fdw_validator(PG_FUNCTION_ARGS)
Definition: file_fdw.c:195
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
bool costs
Definition: explain.h:34
void(* callback)(void *arg)
Definition: elog.h:254
struct ErrorContextCallback * previous
Definition: elog.h:253
DefElem * makeDefElem(char *name, Node *arg, int location)
Definition: makefuncs.c:544
Cost startup
Definition: pathnodes.h:45
void pull_varattnos(Node *node, Index varno, Bitmapset **varattnos)
Definition: var.c:219
double ntuples
Definition: file_fdw.c:95
static void estimate_size(PlannerInfo *root, RelOptInfo *baserel, FileFdwPlanState *fdw_private)
Definition: file_fdw.c:971
#define foreach_delete_current(lst, cell)
Definition: pg_list.h:368
ErrorContextCallback * error_context_stack
Definition: elog.c:88
#define list_make1(x1)
Definition: pg_list.h:227
static int file_acquire_sample_rows(Relation onerel, int elevel, HeapTuple *rows, int targrows, double *totalrows, double *totaldeadrows)
Definition: file_fdw.c:1095
PlanState ps
Definition: execnodes.h:1331
void ExplainPropertyText(const char *qlabel, const char *value, ExplainState *es)
Definition: explain.c:3575
Relids lateral_relids
Definition: pathnodes.h:666
bool defGetBoolean(DefElem *def)
Definition: define.c:111
Cost per_tuple
Definition: pathnodes.h:46
ForeignDataWrapper * GetForeignDataWrapper(Oid fdwid)
Definition: foreign.c:35
List * GetForeignColumnOptions(Oid relid, AttrNumber attnum)
Definition: foreign.c:286
void pfree(void *pointer)
Definition: mcxt.c:1056
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:78
IsForeignScanParallelSafe_function IsForeignScanParallelSafe
Definition: fdwapi.h:240
#define ERROR
Definition: elog.h:43
NameData attname
Definition: pg_attribute.h:40
struct FileFdwPlanState FileFdwPlanState
PG_FUNCTION_INFO_V1(file_fdw_handler)
char * defGetString(DefElem *def)
Definition: define.c:49
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:192
static TupleTableSlot * fileIterateForeignScan(ForeignScanState *node)
Definition: file_fdw.c:704
static char * buf
Definition: pg_test_fsync.c:68
ForeignPath * create_foreignscan_path(PlannerInfo *root, RelOptInfo *rel, PathTarget *target, double rows, Cost startup_cost, Cost total_cost, List *pathkeys, Relids required_outer, Path *fdw_outerpath, List *fdw_private)
Definition: pathnode.c:2100
#define PG_GETARG_OID(n)
Definition: fmgr.h:270
int errcode_for_file_access(void)
Definition: elog.c:593
GetForeignRelSize_function GetForeignRelSize
Definition: fdwapi.h:188
EndForeignScan_function EndForeignScan
Definition: fdwapi.h:194
#define RelationGetRelationName(relation)
Definition: rel.h:453
static bool fileAnalyzeForeignTable(Relation relation, AcquireSampleRowsFunc *func, BlockNumber *totalpages)
Definition: file_fdw.c:780
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:200
MemoryContext CurrentMemoryContext
Definition: mcxt.c:38
char * filename
Definition: file_fdw.c:90
static void fileBeginForeignScan(ForeignScanState *node, int eflags)
Definition: file_fdw.c:651
#define ereport(elevel, rest)
Definition: elog.h:141
static void fileGetOptions(Oid foreigntableid, char **filename, bool *is_program, List **other_options)
Definition: file_fdw.c:356
Index relid
Definition: pathnodes.h:669
List * lappend(List *list, void *datum)
Definition: list.c:322
GetForeignPaths_function GetForeignPaths
Definition: fdwapi.h:189
Expr * clause
Definition: pathnodes.h:1943
static char ** options
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
List * options
Definition: foreign.h:31
#define stat(a, b)
Definition: win32_port.h:255
List * exprs
Definition: pathnodes.h:1044
const char * optname
Definition: file_fdw.c:47
static int elevel
Definition: vacuumlazy.c:143
static void fileGetForeignPaths(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid)
Definition: file_fdw.c:531
ForeignServer * GetForeignServer(Oid serverid)
Definition: foreign.c:109
uintptr_t Datum
Definition: postgres.h:367
unsigned int Index
Definition: c.h:475
List * untransformRelOptions(Datum options)
Definition: reloptions.c:1030
Plan * plan
Definition: execnodes.h:940
double rows
Definition: pathnodes.h:644
#define InvalidOid
Definition: postgres_ext.h:36
int16 attnum
Definition: pg_attribute.h:79
void * fdw_private
Definition: pathnodes.h:695
#define PG_RETURN_VOID()
Definition: fmgr.h:339
bool is_member_of_role(Oid member, Oid role)
Definition: acl.c:4932
void EndCopyFrom(CopyState cstate)
Definition: copy.c:3876
#define makeNode(_type_)
Definition: nodes.h:573
BlockNumber pages
Definition: pathnodes.h:680
static void fileGetForeignRelSize(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid)
Definition: file_fdw.c:500
#define Assert(condition)
Definition: c.h:732
#define lfirst(lc)
Definition: pg_list.h:190
ReScanForeignScan_function ReScanForeignScan
Definition: fdwapi.h:193
static bool check_selective_binary_conversion(RelOptInfo *baserel, Oid foreigntableid, List **columns)
Definition: file_fdw.c:847
IterateForeignScan_function IterateForeignScan
Definition: fdwapi.h:192
static bool is_valid_option(const char *option, Oid context)
Definition: file_fdw.c:337
bool NextCopyFrom(CopyState cstate, ExprContext *econtext, Datum *values, bool *nulls)
Definition: copy.c:3688
static void fileExplainForeignScan(ForeignScanState *node, ExplainState *es)
Definition: file_fdw.c:619
Oid serverid
Definition: foreign.h:56
static int list_length(const List *l)
Definition: pg_list.h:169
List * extract_actual_clauses(List *restrictinfo_list, bool pseudoconstant)
Definition: restrictinfo.c:422
#define MAXALIGN(LEN)
Definition: c.h:685
ForeignScan * make_foreignscan(List *qptlist, List *qpqual, Index scanrelid, List *fdw_exprs, List *fdw_private, List *fdw_scan_tlist, List *fdw_recheck_quals, Plan *outer_plan)
Definition: createplan.c:5429
static void fileReScanForeignScan(ForeignScanState *node)
Definition: file_fdw.c:746
static ForeignScan * fileGetForeignPlan(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid, ForeignPath *best_path, List *tlist, List *scan_clauses, Plan *outer_plan)
Definition: file_fdw.c:584
double cpu_tuple_cost
Definition: costsize.c:112
static void estimate_costs(PlannerInfo *root, RelOptInfo *baserel, FileFdwPlanState *fdw_private, Cost *startup_cost, Cost *total_cost)
Definition: file_fdw.c:1052
static Datum values[MAXATTR]
Definition: bootstrap.c:167
List * options
Definition: foreign.h:57
int(* AcquireSampleRowsFunc)(Relation relation, int elevel, HeapTuple *rows, int targrows, double *totalrows, double *totaldeadrows)
Definition: fdwapi.h:142
struct FileFdwExecutionState FileFdwExecutionState
static char * filename
Definition: pg_dumpall.c:91
void * palloc(Size size)
Definition: mcxt.c:949
int errmsg(const char *fmt,...)
Definition: elog.c:784
List * fdw_private
Definition: pathnodes.h:1320
#define elog(elevel,...)
Definition: elog.h:226
int i
#define NameStr(name)
Definition: c.h:609
#define PG_FUNCTION_ARGS
Definition: fmgr.h:188
char * defname
Definition: parsenodes.h:730
static char format
Definition: pg_basebackup.c:85
Selectivity clauselist_selectivity(PlannerInfo *root, List *clauses, int varRelid, JoinType jointype, SpecialJoinInfo *sjinfo)
Definition: clausesel.c:70
void vacuum_delay_point(void)
Definition: vacuum.c:1940
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
double clamp_row_est(double nrows)
Definition: costsize.c:187
double seq_page_cost
Definition: costsize.c:110
Definition: pg_list.h:50
struct PathTarget * reltarget
Definition: pathnodes.h:652
List * options
Definition: foreign.h:42
#define EXEC_FLAG_EXPLAIN_ONLY
Definition: executor.h:56
int16 AttrNumber
Definition: attnum.h:21
#define RelationGetRelid(relation)
Definition: rel.h:419
QualCost baserestrictcost
Definition: pathnodes.h:704
double Cost
Definition: nodes.h:659
TupleTableSlot * ExecStoreVirtualTuple(TupleTableSlot *slot)
Definition: execTuples.c:1517
SamplerRandomState randstate
Definition: sampling.h:50
double reservoir_get_next_S(ReservoirState rs, double t, int n)
Definition: sampling.c:142