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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) 2010-2020, 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/acl.h"
37 #include "utils/memutils.h"
38 #include "utils/rel.h"
39 #include "utils/sampling.h"
40 
42 
43 /*
44  * Describes the valid options for objects that use this wrapper.
45  */
47 {
48  const char *optname;
49  Oid optcontext; /* Oid of catalog in which option may appear */
50 };
51 
52 /*
53  * Valid options for file_fdw.
54  * These options are based on the options for the COPY FROM command.
55  * But note that force_not_null and force_null are handled as boolean options
56  * attached to a column, not as table options.
57  *
58  * Note: If you are adding new option for user mapping, you need to modify
59  * fileGetOptions(), which currently doesn't bother to look at user mappings.
60  */
61 static const struct FileFdwOption valid_options[] = {
62  /* Data source options */
63  {"filename", ForeignTableRelationId},
64  {"program", ForeignTableRelationId},
65 
66  /* Format options */
67  /* oids option is not supported */
68  {"format", ForeignTableRelationId},
69  {"header", ForeignTableRelationId},
70  {"delimiter", ForeignTableRelationId},
71  {"quote", ForeignTableRelationId},
72  {"escape", ForeignTableRelationId},
73  {"null", ForeignTableRelationId},
74  {"encoding", ForeignTableRelationId},
75  {"force_not_null", AttributeRelationId},
76  {"force_null", AttributeRelationId},
77 
78  /*
79  * force_quote is not supported by file_fdw because it's for COPY TO.
80  */
81 
82  /* Sentinel */
83  {NULL, InvalidOid}
84 };
85 
86 /*
87  * FDW-specific information for RelOptInfo.fdw_private.
88  */
89 typedef struct FileFdwPlanState
90 {
91  char *filename; /* file or program to read from */
92  bool is_program; /* true if filename represents an OS command */
93  List *options; /* merged COPY options, excluding filename and
94  * is_program */
95  BlockNumber pages; /* estimate of file's physical size */
96  double ntuples; /* estimate of number of data rows */
98 
99 /*
100  * FDW-specific information for ForeignScanState.fdw_state.
101  */
102 typedef struct FileFdwExecutionState
103 {
104  char *filename; /* file or program to read from */
105  bool is_program; /* true if filename represents an OS command */
106  List *options; /* merged COPY options, excluding filename and
107  * is_program */
108  CopyState cstate; /* COPY execution state */
110 
111 /*
112  * SQL functions
113  */
116 
117 /*
118  * FDW callback routines
119  */
120 static void fileGetForeignRelSize(PlannerInfo *root,
121  RelOptInfo *baserel,
122  Oid foreigntableid);
123 static void fileGetForeignPaths(PlannerInfo *root,
124  RelOptInfo *baserel,
125  Oid foreigntableid);
127  RelOptInfo *baserel,
128  Oid foreigntableid,
129  ForeignPath *best_path,
130  List *tlist,
131  List *scan_clauses,
132  Plan *outer_plan);
134 static void fileBeginForeignScan(ForeignScanState *node, int eflags);
136 static void fileReScanForeignScan(ForeignScanState *node);
137 static void fileEndForeignScan(ForeignScanState *node);
138 static bool fileAnalyzeForeignTable(Relation relation,
139  AcquireSampleRowsFunc *func,
140  BlockNumber *totalpages);
142  RangeTblEntry *rte);
143 
144 /*
145  * Helper functions
146  */
147 static bool is_valid_option(const char *option, Oid context);
148 static void fileGetOptions(Oid foreigntableid,
149  char **filename,
150  bool *is_program,
151  List **other_options);
153 static bool check_selective_binary_conversion(RelOptInfo *baserel,
154  Oid foreigntableid,
155  List **columns);
156 static void estimate_size(PlannerInfo *root, RelOptInfo *baserel,
157  FileFdwPlanState *fdw_private);
158 static void estimate_costs(PlannerInfo *root, RelOptInfo *baserel,
159  FileFdwPlanState *fdw_private,
160  Cost *startup_cost, Cost *total_cost);
161 static int file_acquire_sample_rows(Relation onerel, int elevel,
162  HeapTuple *rows, int targrows,
163  double *totalrows, double *totaldeadrows);
164 
165 
166 /*
167  * Foreign-data wrapper handler function: return a struct with pointers
168  * to my callback routines.
169  */
170 Datum
172 {
173  FdwRoutine *fdwroutine = makeNode(FdwRoutine);
174 
176  fdwroutine->GetForeignPaths = fileGetForeignPaths;
177  fdwroutine->GetForeignPlan = fileGetForeignPlan;
182  fdwroutine->EndForeignScan = fileEndForeignScan;
185 
186  PG_RETURN_POINTER(fdwroutine);
187 }
188 
189 /*
190  * Validate the generic options given to a FOREIGN DATA WRAPPER, SERVER,
191  * USER MAPPING or FOREIGN TABLE that uses file_fdw.
192  *
193  * Raise an ERROR if the option or its value is considered invalid.
194  */
195 Datum
197 {
198  List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
199  Oid catalog = PG_GETARG_OID(1);
200  char *filename = NULL;
201  DefElem *force_not_null = NULL;
202  DefElem *force_null = NULL;
203  List *other_options = NIL;
204  ListCell *cell;
205 
206  /*
207  * Check that only options supported by file_fdw, and allowed for the
208  * current object type, are given.
209  */
210  foreach(cell, options_list)
211  {
212  DefElem *def = (DefElem *) lfirst(cell);
213 
214  if (!is_valid_option(def->defname, catalog))
215  {
216  const struct FileFdwOption *opt;
218 
219  /*
220  * Unknown option specified, complain about it. Provide a hint
221  * with list of valid options for the object.
222  */
223  initStringInfo(&buf);
224  for (opt = valid_options; opt->optname; opt++)
225  {
226  if (catalog == opt->optcontext)
227  appendStringInfo(&buf, "%s%s", (buf.len > 0) ? ", " : "",
228  opt->optname);
229  }
230 
231  ereport(ERROR,
232  (errcode(ERRCODE_FDW_INVALID_OPTION_NAME),
233  errmsg("invalid option \"%s\"", def->defname),
234  buf.len > 0
235  ? errhint("Valid options in this context are: %s",
236  buf.data)
237  : errhint("There are no valid options in this context.")));
238  }
239 
240  /*
241  * Separate out filename, program, and column-specific options, since
242  * ProcessCopyOptions won't accept them.
243  */
244  if (strcmp(def->defname, "filename") == 0 ||
245  strcmp(def->defname, "program") == 0)
246  {
247  if (filename)
248  ereport(ERROR,
249  (errcode(ERRCODE_SYNTAX_ERROR),
250  errmsg("conflicting or redundant options")));
251 
252  /*
253  * Check permissions for changing which file or program is used by
254  * the file_fdw.
255  *
256  * Only members of the role 'pg_read_server_files' are allowed to
257  * set the 'filename' option of a file_fdw foreign table, while
258  * only members of the role 'pg_execute_server_program' are
259  * allowed to set the 'program' option. This is because we don't
260  * want regular users to be able to control which file gets read
261  * or which program gets executed.
262  *
263  * Putting this sort of permissions check in a validator is a bit
264  * of a crock, but there doesn't seem to be any other place that
265  * can enforce the check more cleanly.
266  *
267  * Note that the valid_options[] array disallows setting filename
268  * and program at any options level other than foreign table ---
269  * otherwise there'd still be a security hole.
270  */
271  if (strcmp(def->defname, "filename") == 0 &&
272  !is_member_of_role(GetUserId(), DEFAULT_ROLE_READ_SERVER_FILES))
273  ereport(ERROR,
274  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
275  errmsg("only superuser or a member of the pg_read_server_files role may specify the filename option of a file_fdw foreign table")));
276 
277  if (strcmp(def->defname, "program") == 0 &&
278  !is_member_of_role(GetUserId(), DEFAULT_ROLE_EXECUTE_SERVER_PROGRAM))
279  ereport(ERROR,
280  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
281  errmsg("only superuser or a member of the pg_execute_server_program role may specify the program option of a file_fdw foreign table")));
282 
283  filename = defGetString(def);
284  }
285 
286  /*
287  * force_not_null is a boolean option; after validation we can discard
288  * it - it will be retrieved later in get_file_fdw_attribute_options()
289  */
290  else if (strcmp(def->defname, "force_not_null") == 0)
291  {
292  if (force_not_null)
293  ereport(ERROR,
294  (errcode(ERRCODE_SYNTAX_ERROR),
295  errmsg("conflicting or redundant options"),
296  errhint("Option \"force_not_null\" supplied more than once for a column.")));
297  force_not_null = def;
298  /* Don't care what the value is, as long as it's a legal boolean */
299  (void) defGetBoolean(def);
300  }
301  /* See comments for force_not_null above */
302  else if (strcmp(def->defname, "force_null") == 0)
303  {
304  if (force_null)
305  ereport(ERROR,
306  (errcode(ERRCODE_SYNTAX_ERROR),
307  errmsg("conflicting or redundant options"),
308  errhint("Option \"force_null\" supplied more than once for a column.")));
309  force_null = def;
310  (void) defGetBoolean(def);
311  }
312  else
313  other_options = lappend(other_options, def);
314  }
315 
316  /*
317  * Now apply the core COPY code's validation logic for more checks.
318  */
319  ProcessCopyOptions(NULL, NULL, true, other_options);
320 
321  /*
322  * Either filename or program option is required for file_fdw foreign
323  * tables.
324  */
325  if (catalog == ForeignTableRelationId && filename == NULL)
326  ereport(ERROR,
327  (errcode(ERRCODE_FDW_DYNAMIC_PARAMETER_VALUE_NEEDED),
328  errmsg("either filename or program is required for file_fdw foreign tables")));
329 
330  PG_RETURN_VOID();
331 }
332 
333 /*
334  * Check if the provided option is one of the valid options.
335  * context is the Oid of the catalog holding the object the option is for.
336  */
337 static bool
338 is_valid_option(const char *option, Oid context)
339 {
340  const struct FileFdwOption *opt;
341 
342  for (opt = valid_options; opt->optname; opt++)
343  {
344  if (context == opt->optcontext && strcmp(opt->optname, option) == 0)
345  return true;
346  }
347  return false;
348 }
349 
350 /*
351  * Fetch the options for a file_fdw foreign table.
352  *
353  * We have to separate out filename/program from the other options because
354  * those must not appear in the options list passed to the core COPY code.
355  */
356 static void
357 fileGetOptions(Oid foreigntableid,
358  char **filename, bool *is_program, List **other_options)
359 {
360  ForeignTable *table;
361  ForeignServer *server;
362  ForeignDataWrapper *wrapper;
363  List *options;
364  ListCell *lc;
365 
366  /*
367  * Extract options from FDW objects. We ignore user mappings because
368  * file_fdw doesn't have any options that can be specified there.
369  *
370  * (XXX Actually, given the current contents of valid_options[], there's
371  * no point in examining anything except the foreign table's own options.
372  * Simplify?)
373  */
374  table = GetForeignTable(foreigntableid);
375  server = GetForeignServer(table->serverid);
376  wrapper = GetForeignDataWrapper(server->fdwid);
377 
378  options = NIL;
379  options = list_concat(options, wrapper->options);
380  options = list_concat(options, server->options);
381  options = list_concat(options, table->options);
382  options = list_concat(options, get_file_fdw_attribute_options(foreigntableid));
383 
384  /*
385  * Separate out the filename or program option (we assume there is only
386  * one).
387  */
388  *filename = NULL;
389  *is_program = false;
390  foreach(lc, options)
391  {
392  DefElem *def = (DefElem *) lfirst(lc);
393 
394  if (strcmp(def->defname, "filename") == 0)
395  {
396  *filename = defGetString(def);
397  options = foreach_delete_current(options, lc);
398  break;
399  }
400  else if (strcmp(def->defname, "program") == 0)
401  {
402  *filename = defGetString(def);
403  *is_program = true;
404  options = foreach_delete_current(options, lc);
405  break;
406  }
407  }
408 
409  /*
410  * The validator should have checked that filename or program was included
411  * in the options, but check again, just in case.
412  */
413  if (*filename == NULL)
414  elog(ERROR, "either filename or program is required for file_fdw foreign tables");
415 
416  *other_options = options;
417 }
418 
419 /*
420  * Retrieve per-column generic options from pg_attribute and construct a list
421  * of DefElems representing them.
422  *
423  * At the moment we only have "force_not_null", and "force_null",
424  * which should each be combined into a single DefElem listing all such
425  * columns, since that's what COPY expects.
426  */
427 static List *
429 {
430  Relation rel;
431  TupleDesc tupleDesc;
432  AttrNumber natts;
434  List *fnncolumns = NIL;
435  List *fncolumns = NIL;
436 
437  List *options = NIL;
438 
439  rel = table_open(relid, AccessShareLock);
440  tupleDesc = RelationGetDescr(rel);
441  natts = tupleDesc->natts;
442 
443  /* Retrieve FDW options for all user-defined attributes. */
444  for (attnum = 1; attnum <= natts; attnum++)
445  {
446  Form_pg_attribute attr = TupleDescAttr(tupleDesc, attnum - 1);
447  List *options;
448  ListCell *lc;
449 
450  /* Skip dropped attributes. */
451  if (attr->attisdropped)
452  continue;
453 
454  options = GetForeignColumnOptions(relid, attnum);
455  foreach(lc, options)
456  {
457  DefElem *def = (DefElem *) lfirst(lc);
458 
459  if (strcmp(def->defname, "force_not_null") == 0)
460  {
461  if (defGetBoolean(def))
462  {
463  char *attname = pstrdup(NameStr(attr->attname));
464 
465  fnncolumns = lappend(fnncolumns, makeString(attname));
466  }
467  }
468  else if (strcmp(def->defname, "force_null") == 0)
469  {
470  if (defGetBoolean(def))
471  {
472  char *attname = pstrdup(NameStr(attr->attname));
473 
474  fncolumns = lappend(fncolumns, makeString(attname));
475  }
476  }
477  /* maybe in future handle other options here */
478  }
479  }
480 
482 
483  /*
484  * Return DefElem only when some column(s) have force_not_null /
485  * force_null options set
486  */
487  if (fnncolumns != NIL)
488  options = lappend(options, makeDefElem("force_not_null", (Node *) fnncolumns, -1));
489 
490  if (fncolumns != NIL)
491  options = lappend(options, makeDefElem("force_null", (Node *) fncolumns, -1));
492 
493  return options;
494 }
495 
496 /*
497  * fileGetForeignRelSize
498  * Obtain relation size estimates for a foreign table
499  */
500 static void
502  RelOptInfo *baserel,
503  Oid foreigntableid)
504 {
505  FileFdwPlanState *fdw_private;
506 
507  /*
508  * Fetch options. We only need filename (or program) at this point, but
509  * we might as well get everything and not need to re-fetch it later in
510  * planning.
511  */
512  fdw_private = (FileFdwPlanState *) palloc(sizeof(FileFdwPlanState));
513  fileGetOptions(foreigntableid,
514  &fdw_private->filename,
515  &fdw_private->is_program,
516  &fdw_private->options);
517  baserel->fdw_private = (void *) fdw_private;
518 
519  /* Estimate relation size */
520  estimate_size(root, baserel, fdw_private);
521 }
522 
523 /*
524  * fileGetForeignPaths
525  * Create possible access paths for a scan on the foreign table
526  *
527  * Currently we don't support any push-down feature, so there is only one
528  * possible access path, which simply returns all records in the order in
529  * the data file.
530  */
531 static void
533  RelOptInfo *baserel,
534  Oid foreigntableid)
535 {
536  FileFdwPlanState *fdw_private = (FileFdwPlanState *) baserel->fdw_private;
537  Cost startup_cost;
538  Cost total_cost;
539  List *columns;
540  List *coptions = NIL;
541 
542  /* Decide whether to selectively perform binary conversion */
544  foreigntableid,
545  &columns))
546  coptions = list_make1(makeDefElem("convert_selectively",
547  (Node *) columns, -1));
548 
549  /* Estimate costs */
550  estimate_costs(root, baserel, fdw_private,
551  &startup_cost, &total_cost);
552 
553  /*
554  * Create a ForeignPath node and add it as only possible path. We use the
555  * fdw_private list of the path to carry the convert_selectively option;
556  * it will be propagated into the fdw_private list of the Plan node.
557  *
558  * We don't support pushing join clauses into the quals of this path, but
559  * it could still have required parameterization due to LATERAL refs in
560  * its tlist.
561  */
562  add_path(baserel, (Path *)
563  create_foreignscan_path(root, baserel,
564  NULL, /* default pathtarget */
565  baserel->rows,
566  startup_cost,
567  total_cost,
568  NIL, /* no pathkeys */
569  baserel->lateral_relids,
570  NULL, /* no extra plan */
571  coptions));
572 
573  /*
574  * If data file was sorted, and we knew it somehow, we could insert
575  * appropriate pathkeys into the ForeignPath node to tell the planner
576  * that.
577  */
578 }
579 
580 /*
581  * fileGetForeignPlan
582  * Create a ForeignScan plan node for scanning the foreign table
583  */
584 static ForeignScan *
586  RelOptInfo *baserel,
587  Oid foreigntableid,
588  ForeignPath *best_path,
589  List *tlist,
590  List *scan_clauses,
591  Plan *outer_plan)
592 {
593  Index scan_relid = baserel->relid;
594 
595  /*
596  * We have no native ability to evaluate restriction clauses, so we just
597  * put all the scan_clauses into the plan node's qual list for the
598  * executor to check. So all we have to do here is strip RestrictInfo
599  * nodes from the clauses and ignore pseudoconstants (which will be
600  * handled elsewhere).
601  */
602  scan_clauses = extract_actual_clauses(scan_clauses, false);
603 
604  /* Create the ForeignScan node */
605  return make_foreignscan(tlist,
606  scan_clauses,
607  scan_relid,
608  NIL, /* no expressions to evaluate */
609  best_path->fdw_private,
610  NIL, /* no custom tlist */
611  NIL, /* no remote quals */
612  outer_plan);
613 }
614 
615 /*
616  * fileExplainForeignScan
617  * Produce extra output for EXPLAIN
618  */
619 static void
621 {
622  char *filename;
623  bool is_program;
624  List *options;
625 
626  /* Fetch options --- we only need filename and is_program at this point */
628  &filename, &is_program, &options);
629 
630  if (is_program)
631  ExplainPropertyText("Foreign Program", filename, es);
632  else
633  ExplainPropertyText("Foreign File", filename, es);
634 
635  /* Suppress file size if we're not showing cost details */
636  if (es->costs)
637  {
638  struct stat stat_buf;
639 
640  if (!is_program &&
641  stat(filename, &stat_buf) == 0)
642  ExplainPropertyInteger("Foreign File Size", "b",
643  (int64) stat_buf.st_size, es);
644  }
645 }
646 
647 /*
648  * fileBeginForeignScan
649  * Initiate access to the file by creating CopyState
650  */
651 static void
653 {
654  ForeignScan *plan = (ForeignScan *) node->ss.ps.plan;
655  char *filename;
656  bool is_program;
657  List *options;
658  CopyState cstate;
659  FileFdwExecutionState *festate;
660 
661  /*
662  * Do nothing in EXPLAIN (no ANALYZE) case. node->fdw_state stays NULL.
663  */
664  if (eflags & EXEC_FLAG_EXPLAIN_ONLY)
665  return;
666 
667  /* Fetch options of foreign table */
669  &filename, &is_program, &options);
670 
671  /* Add any options from the plan (currently only convert_selectively) */
673 
674  /*
675  * Create CopyState from FDW options. We always acquire all columns, so
676  * as to match the expected ScanTupleSlot signature.
677  */
678  cstate = BeginCopyFrom(NULL,
679  node->ss.ss_currentRelation,
680  filename,
681  is_program,
682  NULL,
683  NIL,
684  options);
685 
686  /*
687  * Save state in node->fdw_state. We must save enough information to call
688  * BeginCopyFrom() again.
689  */
690  festate = (FileFdwExecutionState *) palloc(sizeof(FileFdwExecutionState));
691  festate->filename = filename;
692  festate->is_program = is_program;
693  festate->options = options;
694  festate->cstate = cstate;
695 
696  node->fdw_state = (void *) festate;
697 }
698 
699 /*
700  * fileIterateForeignScan
701  * Read next record from the data file and store it into the
702  * ScanTupleSlot as a virtual tuple
703  */
704 static TupleTableSlot *
706 {
708  TupleTableSlot *slot = node->ss.ss_ScanTupleSlot;
709  bool found;
710  ErrorContextCallback errcallback;
711 
712  /* Set up callback to identify error line number. */
713  errcallback.callback = CopyFromErrorCallback;
714  errcallback.arg = (void *) festate->cstate;
715  errcallback.previous = error_context_stack;
716  error_context_stack = &errcallback;
717 
718  /*
719  * The protocol for loading a virtual tuple into a slot is first
720  * ExecClearTuple, then fill the values/isnull arrays, then
721  * ExecStoreVirtualTuple. If we don't find another row in the file, we
722  * just skip the last step, leaving the slot empty as required.
723  *
724  * We can pass ExprContext = NULL because we read all columns from the
725  * file, so no need to evaluate default expressions.
726  *
727  * We can also pass tupleOid = NULL because we don't allow oids for
728  * foreign tables.
729  */
730  ExecClearTuple(slot);
731  found = NextCopyFrom(festate->cstate, NULL,
732  slot->tts_values, slot->tts_isnull);
733  if (found)
734  ExecStoreVirtualTuple(slot);
735 
736  /* Remove error callback. */
737  error_context_stack = errcallback.previous;
738 
739  return slot;
740 }
741 
742 /*
743  * fileReScanForeignScan
744  * Rescan table, possibly with new parameters
745  */
746 static void
748 {
750 
751  EndCopyFrom(festate->cstate);
752 
753  festate->cstate = BeginCopyFrom(NULL,
754  node->ss.ss_currentRelation,
755  festate->filename,
756  festate->is_program,
757  NULL,
758  NIL,
759  festate->options);
760 }
761 
762 /*
763  * fileEndForeignScan
764  * Finish scanning foreign table and dispose objects used for this scan
765  */
766 static void
768 {
770 
771  /* if festate is NULL, we are in EXPLAIN; nothing to do */
772  if (festate)
773  EndCopyFrom(festate->cstate);
774 }
775 
776 /*
777  * fileAnalyzeForeignTable
778  * Test whether analyzing this foreign table is supported
779  */
780 static bool
782  AcquireSampleRowsFunc *func,
783  BlockNumber *totalpages)
784 {
785  char *filename;
786  bool is_program;
787  List *options;
788  struct stat stat_buf;
789 
790  /* Fetch options of foreign table */
791  fileGetOptions(RelationGetRelid(relation), &filename, &is_program, &options);
792 
793  /*
794  * If this is a program instead of a file, just return false to skip
795  * analyzing the table. We could run the program and collect stats on
796  * whatever it currently returns, but it seems likely that in such cases
797  * the output would be too volatile for the stats to be useful. Maybe
798  * there should be an option to enable doing this?
799  */
800  if (is_program)
801  return false;
802 
803  /*
804  * Get size of the file. (XXX if we fail here, would it be better to just
805  * return false to skip analyzing the table?)
806  */
807  if (stat(filename, &stat_buf) < 0)
808  ereport(ERROR,
810  errmsg("could not stat file \"%s\": %m",
811  filename)));
812 
813  /*
814  * Convert size to pages. Must return at least 1 so that we can tell
815  * later on that pg_class.relpages is not default.
816  */
817  *totalpages = (stat_buf.st_size + (BLCKSZ - 1)) / BLCKSZ;
818  if (*totalpages < 1)
819  *totalpages = 1;
820 
821  *func = file_acquire_sample_rows;
822 
823  return true;
824 }
825 
826 /*
827  * fileIsForeignScanParallelSafe
828  * Reading a file, or external program, in a parallel worker should work
829  * just the same as reading it in the leader, so mark scans safe.
830  */
831 static bool
833  RangeTblEntry *rte)
834 {
835  return true;
836 }
837 
838 /*
839  * check_selective_binary_conversion
840  *
841  * Check to see if it's useful to convert only a subset of the file's columns
842  * to binary. If so, construct a list of the column names to be converted,
843  * return that at *columns, and return true. (Note that it's possible to
844  * determine that no columns need be converted, for instance with a COUNT(*)
845  * query. So we can't use returning a NIL list to indicate failure.)
846  */
847 static bool
849  Oid foreigntableid,
850  List **columns)
851 {
852  ForeignTable *table;
853  ListCell *lc;
854  Relation rel;
855  TupleDesc tupleDesc;
857  Bitmapset *attrs_used = NULL;
858  bool has_wholerow = false;
859  int numattrs;
860  int i;
861 
862  *columns = NIL; /* default result */
863 
864  /*
865  * Check format of the file. If binary format, this is irrelevant.
866  */
867  table = GetForeignTable(foreigntableid);
868  foreach(lc, table->options)
869  {
870  DefElem *def = (DefElem *) lfirst(lc);
871 
872  if (strcmp(def->defname, "format") == 0)
873  {
874  char *format = defGetString(def);
875 
876  if (strcmp(format, "binary") == 0)
877  return false;
878  break;
879  }
880  }
881 
882  /* Collect all the attributes needed for joins or final output. */
883  pull_varattnos((Node *) baserel->reltarget->exprs, baserel->relid,
884  &attrs_used);
885 
886  /* Add all the attributes used by restriction clauses. */
887  foreach(lc, baserel->baserestrictinfo)
888  {
889  RestrictInfo *rinfo = (RestrictInfo *) lfirst(lc);
890 
891  pull_varattnos((Node *) rinfo->clause, baserel->relid,
892  &attrs_used);
893  }
894 
895  /* Convert attribute numbers to column names. */
896  rel = table_open(foreigntableid, AccessShareLock);
897  tupleDesc = RelationGetDescr(rel);
898 
899  while ((attnum = bms_first_member(attrs_used)) >= 0)
900  {
901  /* Adjust for system attributes. */
903 
904  if (attnum == 0)
905  {
906  has_wholerow = true;
907  break;
908  }
909 
910  /* Ignore system attributes. */
911  if (attnum < 0)
912  continue;
913 
914  /* Get user attributes. */
915  if (attnum > 0)
916  {
917  Form_pg_attribute attr = TupleDescAttr(tupleDesc, attnum - 1);
918  char *attname = NameStr(attr->attname);
919 
920  /* Skip dropped attributes (probably shouldn't see any here). */
921  if (attr->attisdropped)
922  continue;
923 
924  /*
925  * Skip generated columns (COPY won't accept them in the column
926  * list)
927  */
928  if (attr->attgenerated)
929  continue;
930  *columns = lappend(*columns, makeString(pstrdup(attname)));
931  }
932  }
933 
934  /* Count non-dropped user attributes while we have the tupdesc. */
935  numattrs = 0;
936  for (i = 0; i < tupleDesc->natts; i++)
937  {
938  Form_pg_attribute attr = TupleDescAttr(tupleDesc, i);
939 
940  if (attr->attisdropped)
941  continue;
942  numattrs++;
943  }
944 
946 
947  /* If there's a whole-row reference, fail: we need all the columns. */
948  if (has_wholerow)
949  {
950  *columns = NIL;
951  return false;
952  }
953 
954  /* If all the user attributes are needed, fail. */
955  if (numattrs == list_length(*columns))
956  {
957  *columns = NIL;
958  return false;
959  }
960 
961  return true;
962 }
963 
964 /*
965  * Estimate size of a foreign table.
966  *
967  * The main result is returned in baserel->rows. We also set
968  * fdw_private->pages and fdw_private->ntuples for later use in the cost
969  * calculation.
970  */
971 static void
973  FileFdwPlanState *fdw_private)
974 {
975  struct stat stat_buf;
976  BlockNumber pages;
977  double ntuples;
978  double nrows;
979 
980  /*
981  * Get size of the file. It might not be there at plan time, though, in
982  * which case we have to use a default estimate. We also have to fall
983  * back to the default if using a program as the input.
984  */
985  if (fdw_private->is_program || stat(fdw_private->filename, &stat_buf) < 0)
986  stat_buf.st_size = 10 * BLCKSZ;
987 
988  /*
989  * Convert size to pages for use in I/O cost estimate later.
990  */
991  pages = (stat_buf.st_size + (BLCKSZ - 1)) / BLCKSZ;
992  if (pages < 1)
993  pages = 1;
994  fdw_private->pages = pages;
995 
996  /*
997  * Estimate the number of tuples in the file.
998  */
999  if (baserel->pages > 0)
1000  {
1001  /*
1002  * We have # of pages and # of tuples from pg_class (that is, from a
1003  * previous ANALYZE), so compute a tuples-per-page estimate and scale
1004  * that by the current file size.
1005  */
1006  double density;
1007 
1008  density = baserel->tuples / (double) baserel->pages;
1009  ntuples = clamp_row_est(density * (double) pages);
1010  }
1011  else
1012  {
1013  /*
1014  * Otherwise we have to fake it. We back into this estimate using the
1015  * planner's idea of the relation width; which is bogus if not all
1016  * columns are being read, not to mention that the text representation
1017  * of a row probably isn't the same size as its internal
1018  * representation. Possibly we could do something better, but the
1019  * real answer to anyone who complains is "ANALYZE" ...
1020  */
1021  int tuple_width;
1022 
1023  tuple_width = MAXALIGN(baserel->reltarget->width) +
1025  ntuples = clamp_row_est((double) stat_buf.st_size /
1026  (double) tuple_width);
1027  }
1028  fdw_private->ntuples = ntuples;
1029 
1030  /*
1031  * Now estimate the number of rows returned by the scan after applying the
1032  * baserestrictinfo quals.
1033  */
1034  nrows = ntuples *
1036  baserel->baserestrictinfo,
1037  0,
1038  JOIN_INNER,
1039  NULL);
1040 
1041  nrows = clamp_row_est(nrows);
1042 
1043  /* Save the output-rows estimate for the planner */
1044  baserel->rows = nrows;
1045 }
1046 
1047 /*
1048  * Estimate costs of scanning a foreign table.
1049  *
1050  * Results are returned in *startup_cost and *total_cost.
1051  */
1052 static void
1054  FileFdwPlanState *fdw_private,
1055  Cost *startup_cost, Cost *total_cost)
1056 {
1057  BlockNumber pages = fdw_private->pages;
1058  double ntuples = fdw_private->ntuples;
1059  Cost run_cost = 0;
1060  Cost cpu_per_tuple;
1061 
1062  /*
1063  * We estimate costs almost the same way as cost_seqscan(), thus assuming
1064  * that I/O costs are equivalent to a regular table file of the same size.
1065  * However, we take per-tuple CPU costs as 10x of a seqscan, to account
1066  * for the cost of parsing records.
1067  *
1068  * In the case of a program source, this calculation is even more divorced
1069  * from reality, but we have no good alternative; and it's not clear that
1070  * the numbers we produce here matter much anyway, since there's only one
1071  * access path for the rel.
1072  */
1073  run_cost += seq_page_cost * pages;
1074 
1075  *startup_cost = baserel->baserestrictcost.startup;
1076  cpu_per_tuple = cpu_tuple_cost * 10 + baserel->baserestrictcost.per_tuple;
1077  run_cost += cpu_per_tuple * ntuples;
1078  *total_cost = *startup_cost + run_cost;
1079 }
1080 
1081 /*
1082  * file_acquire_sample_rows -- acquire a random sample of rows from the table
1083  *
1084  * Selected rows are returned in the caller-allocated array rows[],
1085  * which must have at least targrows entries.
1086  * The actual number of rows selected is returned as the function result.
1087  * We also count the total number of rows in the file and return it into
1088  * *totalrows. Note that *totaldeadrows is always set to 0.
1089  *
1090  * Note that the returned list of rows is not always in order by physical
1091  * position in the file. Therefore, correlation estimates derived later
1092  * may be meaningless, but it's OK because we don't use the estimates
1093  * currently (the planner only pays attention to correlation for indexscans).
1094  */
1095 static int
1097  HeapTuple *rows, int targrows,
1098  double *totalrows, double *totaldeadrows)
1099 {
1100  int numrows = 0;
1101  double rowstoskip = -1; /* -1 means not set yet */
1102  ReservoirStateData rstate;
1103  TupleDesc tupDesc;
1104  Datum *values;
1105  bool *nulls;
1106  bool found;
1107  char *filename;
1108  bool is_program;
1109  List *options;
1110  CopyState cstate;
1111  ErrorContextCallback errcallback;
1112  MemoryContext oldcontext = CurrentMemoryContext;
1113  MemoryContext tupcontext;
1114 
1115  Assert(onerel);
1116  Assert(targrows > 0);
1117 
1118  tupDesc = RelationGetDescr(onerel);
1119  values = (Datum *) palloc(tupDesc->natts * sizeof(Datum));
1120  nulls = (bool *) palloc(tupDesc->natts * sizeof(bool));
1121 
1122  /* Fetch options of foreign table */
1123  fileGetOptions(RelationGetRelid(onerel), &filename, &is_program, &options);
1124 
1125  /*
1126  * Create CopyState from FDW options.
1127  */
1128  cstate = BeginCopyFrom(NULL, onerel, filename, is_program, NULL, NIL,
1129  options);
1130 
1131  /*
1132  * Use per-tuple memory context to prevent leak of memory used to read
1133  * rows from the file with Copy routines.
1134  */
1136  "file_fdw temporary context",
1138 
1139  /* Prepare for sampling rows */
1140  reservoir_init_selection_state(&rstate, targrows);
1141 
1142  /* Set up callback to identify error line number. */
1143  errcallback.callback = CopyFromErrorCallback;
1144  errcallback.arg = (void *) cstate;
1145  errcallback.previous = error_context_stack;
1146  error_context_stack = &errcallback;
1147 
1148  *totalrows = 0;
1149  *totaldeadrows = 0;
1150  for (;;)
1151  {
1152  /* Check for user-requested abort or sleep */
1154 
1155  /* Fetch next row */
1156  MemoryContextReset(tupcontext);
1157  MemoryContextSwitchTo(tupcontext);
1158 
1159  found = NextCopyFrom(cstate, NULL, values, nulls);
1160 
1161  MemoryContextSwitchTo(oldcontext);
1162 
1163  if (!found)
1164  break;
1165 
1166  /*
1167  * The first targrows sample rows are simply copied into the
1168  * reservoir. Then we start replacing tuples in the sample until we
1169  * reach the end of the relation. This algorithm is from Jeff Vitter's
1170  * paper (see more info in commands/analyze.c).
1171  */
1172  if (numrows < targrows)
1173  {
1174  rows[numrows++] = heap_form_tuple(tupDesc, values, nulls);
1175  }
1176  else
1177  {
1178  /*
1179  * t in Vitter's paper is the number of records already processed.
1180  * If we need to compute a new S value, we must use the
1181  * not-yet-incremented value of totalrows as t.
1182  */
1183  if (rowstoskip < 0)
1184  rowstoskip = reservoir_get_next_S(&rstate, *totalrows, targrows);
1185 
1186  if (rowstoskip <= 0)
1187  {
1188  /*
1189  * Found a suitable tuple, so save it, replacing one old tuple
1190  * at random
1191  */
1192  int k = (int) (targrows * sampler_random_fract(rstate.randstate));
1193 
1194  Assert(k >= 0 && k < targrows);
1195  heap_freetuple(rows[k]);
1196  rows[k] = heap_form_tuple(tupDesc, values, nulls);
1197  }
1198 
1199  rowstoskip -= 1;
1200  }
1201 
1202  *totalrows += 1;
1203  }
1204 
1205  /* Remove error callback. */
1206  error_context_stack = errcallback.previous;
1207 
1208  /* Clean up. */
1209  MemoryContextDelete(tupcontext);
1210 
1211  EndCopyFrom(cstate);
1212 
1213  pfree(values);
1214  pfree(nulls);
1215 
1216  /*
1217  * Emit some interesting relation info
1218  */
1219  ereport(elevel,
1220  (errmsg("\"%s\": file contains %.0f rows; "
1221  "%d rows in sample",
1222  RelationGetRelationName(onerel),
1223  *totalrows, numrows)));
1224 
1225  return numrows;
1226 }
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:360
#define NIL
Definition: pg_list.h:65
ScanState ss
Definition: execnodes.h:1794
static bool fileIsForeignScanParallelSafe(PlannerInfo *root, RelOptInfo *rel, RangeTblEntry *rte)
Definition: file_fdw.c:832
#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:428
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:211
#define AllocSetContextCreate
Definition: memutils.h:170
Oid optcontext
Definition: file_fdw.c:49
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:133
int errhint(const char *fmt,...)
Definition: elog.c:1071
static void fileEndForeignScan(ForeignScanState *node)
Definition: file_fdw.c:767
void ExplainPropertyInteger(const char *qlabel, const char *unit, int64 value, ExplainState *es)
Definition: explain.c:4237
static const struct FileFdwOption valid_options[]
Definition: file_fdw.c:61
void add_path(RelOptInfo *parent_rel, Path *new_path)
Definition: pathnode.c:422
ExplainForeignScan_function ExplainForeignScan
Definition: fdwapi.h:229
void CopyFromErrorCallback(void *arg)
Definition: copy.c:2284
BlockNumber pages
Definition: file_fdw.c:95
static TupleTableSlot * ExecClearTuple(TupleTableSlot *slot)
Definition: tuptable.h:425
#define RelationGetDescr(relation)
Definition: rel.h:482
List * options
Definition: file_fdw.c:93
Oid GetUserId(void)
Definition: miscinit.c:450
AnalyzeForeignTable_function AnalyzeForeignTable
Definition: fdwapi.h:234
Datum file_fdw_handler(PG_FUNCTION_ARGS)
Definition: file_fdw.c:171
PG_MODULE_MAGIC
Definition: file_fdw.c:41
#define PG_GETARG_DATUM(n)
Definition: fmgr.h:268
#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:3383
char * pstrdup(const char *in)
Definition: mcxt.c:1186
double tuples
Definition: pathnodes.h:705
List * baserestrictinfo
Definition: pathnodes.h:727
List * fdw_private
Definition: plannodes.h:618
void ProcessCopyOptions(ParseState *pstate, CopyState cstate, bool is_from, List *options)
Definition: copy.c:1156
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
double sampler_random_fract(SamplerRandomState randstate)
Definition: sampling.c:242
#define AccessShareLock
Definition: lockdefs.h:36
Definition: nodes.h:529
List * list_concat(List *list1, const List *list2)
Definition: list.c:515
int errcode(int sqlerrcode)
Definition: elog.c:610
ForeignTable * GetForeignTable(Oid relid)
Definition: foreign.c:248
#define FirstLowInvalidHeapAttributeNumber
Definition: sysattr.h:27
TupleTableSlot * ss_ScanTupleSlot
Definition: execnodes.h:1335
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:133
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
Relation ss_currentRelation
Definition: execnodes.h:1333
Datum file_fdw_validator(PG_FUNCTION_ARGS)
Definition: file_fdw.c:196
void heap_freetuple(HeapTuple htup)
Definition: heaptuple.c:1338
unsigned int Oid
Definition: postgres_ext.h:31
bool costs
Definition: explain.h:43
void(* callback)(void *arg)
Definition: elog.h:229
struct ErrorContextCallback * previous
Definition: elog.h:228
DefElem * makeDefElem(char *name, Node *arg, int location)
Definition: makefuncs.c:546
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:96
static void estimate_size(PlannerInfo *root, RelOptInfo *baserel, FileFdwPlanState *fdw_private)
Definition: file_fdw.c:972
#define foreach_delete_current(lst, cell)
Definition: pg_list.h:368
ErrorContextCallback * error_context_stack
Definition: elog.c:92
#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:1096
PlanState ps
Definition: execnodes.h:1332
void ExplainPropertyText(const char *qlabel, const char *value, ExplainState *es)
Definition: explain.c:4228
Relids lateral_relids
Definition: pathnodes.h:690
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:91
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:705
static char * buf
Definition: pg_test_fsync.c:67
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:2133
#define PG_GETARG_OID(n)
Definition: fmgr.h:275
int errcode_for_file_access(void)
Definition: elog.c:633
GetForeignRelSize_function GetForeignRelSize
Definition: fdwapi.h:188
EndForeignScan_function EndForeignScan
Definition: fdwapi.h:194
#define RelationGetRelationName(relation)
Definition: rel.h:490
static bool fileAnalyzeForeignTable(Relation relation, AcquireSampleRowsFunc *func, BlockNumber *totalpages)
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FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:193
MemoryContext CurrentMemoryContext
Definition: mcxt.c:38
char * filename
Definition: file_fdw.c:91
static void fileBeginForeignScan(ForeignScanState *node, int eflags)
Definition: file_fdw.c:652
static void fileGetOptions(Oid foreigntableid, char **filename, bool *is_program, List **other_options)
Definition: file_fdw.c:357
Index relid
Definition: pathnodes.h:693
List * lappend(List *list, void *datum)
Definition: list.c:321
GetForeignPaths_function GetForeignPaths
Definition: fdwapi.h:189
Expr * clause
Definition: pathnodes.h:1985
static char ** options
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
List * options
Definition: foreign.h:31
#define stat(a, b)
Definition: win32_port.h:255
List * exprs
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const char * optname
Definition: file_fdw.c:48
static int elevel
Definition: vacuumlazy.c:330
static void fileGetForeignPaths(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid)
Definition: file_fdw.c:532
ForeignServer * GetForeignServer(Oid serverid)
Definition: foreign.c:109
uintptr_t Datum
Definition: postgres.h:367
unsigned int Index
Definition: c.h:482
List * untransformRelOptions(Datum options)
Definition: reloptions.c:1308
Plan * plan
Definition: execnodes.h:945
double rows
Definition: pathnodes.h:668
#define InvalidOid
Definition: postgres_ext.h:36
int16 attnum
Definition: pg_attribute.h:79
#define ereport(elevel,...)
Definition: elog.h:144
void * fdw_private
Definition: pathnodes.h:719
#define PG_RETURN_VOID()
Definition: fmgr.h:348
bool is_member_of_role(Oid member, Oid role)
Definition: acl.c:4916
void EndCopyFrom(CopyState cstate)
Definition: copy.c:3876
#define makeNode(_type_)
Definition: nodes.h:577
BlockNumber pages
Definition: pathnodes.h:704
static void fileGetForeignRelSize(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid)
Definition: file_fdw.c:501
#define Assert(condition)
Definition: c.h:745
#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:848
IterateForeignScan_function IterateForeignScan
Definition: fdwapi.h:192
static bool is_valid_option(const char *option, Oid context)
Definition: file_fdw.c:338
bool NextCopyFrom(CopyState cstate, ExprContext *econtext, Datum *values, bool *nulls)
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static void fileExplainForeignScan(ForeignScanState *node, ExplainState *es)
Definition: file_fdw.c:620
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:698
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:5515
static void fileReScanForeignScan(ForeignScanState *node)
Definition: file_fdw.c:747
static ForeignScan * fileGetForeignPlan(PlannerInfo *root, RelOptInfo *baserel, Oid foreigntableid, ForeignPath *best_path, List *tlist, List *scan_clauses, Plan *outer_plan)
Definition: file_fdw.c:585
double cpu_tuple_cost
Definition: costsize.c:113
static void estimate_costs(PlannerInfo *root, RelOptInfo *baserel, FileFdwPlanState *fdw_private, Cost *startup_cost, Cost *total_cost)
Definition: file_fdw.c:1053
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:90
void * palloc(Size size)
Definition: mcxt.c:949
int errmsg(const char *fmt,...)
Definition: elog.c:824
List * fdw_private
Definition: pathnodes.h:1350
#define elog(elevel,...)
Definition: elog.h:214
int i
#define NameStr(name)
Definition: c.h:622
#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
char * defname
Definition: parsenodes.h:732
static char format
Selectivity clauselist_selectivity(PlannerInfo *root, List *clauses, int varRelid, JoinType jointype, SpecialJoinInfo *sjinfo)
Definition: clausesel.c:69
void vacuum_delay_point(void)
Definition: vacuum.c:1995
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
double clamp_row_est(double nrows)
Definition: costsize.c:189
double seq_page_cost
Definition: costsize.c:111
Definition: pg_list.h:50
struct PathTarget * reltarget
Definition: pathnodes.h:676
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:456
QualCost baserestrictcost
Definition: pathnodes.h:728
double Cost
Definition: nodes.h:663
TupleTableSlot * ExecStoreVirtualTuple(TupleTableSlot *slot)
Definition: execTuples.c:1522
SamplerRandomState randstate
Definition: sampling.h:50
double reservoir_get_next_S(ReservoirState rs, double t, int n)
Definition: sampling.c:146