Line data Source code
1 : /*-------------------------------------------------------------------------
2 : * stat_utils.c
3 : *
4 : * PostgreSQL statistics manipulation utilities.
5 : *
6 : * Code supporting the direct manipulation of statistics.
7 : *
8 : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
9 : * Portions Copyright (c) 1994, Regents of the University of California
10 : *
11 : * IDENTIFICATION
12 : * src/backend/statistics/stat_utils.c
13 : *
14 : *-------------------------------------------------------------------------
15 : */
16 :
17 : #include "postgres.h"
18 :
19 : #include "access/htup_details.h"
20 : #include "access/relation.h"
21 : #include "catalog/index.h"
22 : #include "catalog/namespace.h"
23 : #include "catalog/pg_class.h"
24 : #include "catalog/pg_collation.h"
25 : #include "catalog/pg_database.h"
26 : #include "catalog/pg_statistic.h"
27 : #include "funcapi.h"
28 : #include "miscadmin.h"
29 : #include "nodes/nodeFuncs.h"
30 : #include "statistics/stat_utils.h"
31 : #include "storage/lmgr.h"
32 : #include "utils/acl.h"
33 : #include "utils/array.h"
34 : #include "utils/builtins.h"
35 : #include "utils/lsyscache.h"
36 : #include "utils/rel.h"
37 : #include "utils/syscache.h"
38 : #include "utils/typcache.h"
39 :
40 : /* Default values assigned to new pg_statistic tuples. */
41 : #define DEFAULT_STATATT_NULL_FRAC Float4GetDatum(0.0) /* stanullfrac */
42 : #define DEFAULT_STATATT_AVG_WIDTH Int32GetDatum(0) /* stawidth, same as
43 : * unknown */
44 : #define DEFAULT_STATATT_N_DISTINCT Float4GetDatum(0.0) /* stadistinct, same as
45 : * unknown */
46 :
47 : static Node *statatt_get_index_expr(Relation rel, int attnum);
48 :
49 : /*
50 : * Ensure that a given argument is not null.
51 : */
52 : void
53 5034 : stats_check_required_arg(FunctionCallInfo fcinfo,
54 : struct StatsArgInfo *arginfo,
55 : int argnum)
56 : {
57 5034 : if (PG_ARGISNULL(argnum))
58 54 : ereport(ERROR,
59 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
60 : errmsg("argument \"%s\" must not be null",
61 : arginfo[argnum].argname)));
62 4980 : }
63 :
64 : /*
65 : * Check that argument is either NULL or a one dimensional array with no
66 : * NULLs.
67 : *
68 : * If a problem is found, emit a WARNING, and return false. Otherwise return
69 : * true.
70 : */
71 : bool
72 2064 : stats_check_arg_array(FunctionCallInfo fcinfo,
73 : struct StatsArgInfo *arginfo,
74 : int argnum)
75 : {
76 : ArrayType *arr;
77 :
78 2064 : if (PG_ARGISNULL(argnum))
79 1700 : return true;
80 :
81 364 : arr = DatumGetArrayTypeP(PG_GETARG_DATUM(argnum));
82 :
83 364 : if (ARR_NDIM(arr) != 1)
84 : {
85 0 : ereport(WARNING,
86 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
87 : errmsg("argument \"%s\" must not be a multidimensional array",
88 : arginfo[argnum].argname)));
89 0 : return false;
90 : }
91 :
92 364 : if (array_contains_nulls(arr))
93 : {
94 3 : ereport(WARNING,
95 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
96 : errmsg("argument \"%s\" array must not contain null values",
97 : arginfo[argnum].argname)));
98 3 : return false;
99 : }
100 :
101 361 : return true;
102 : }
103 :
104 : /*
105 : * Enforce parameter pairs that must be specified together (or not at all) for
106 : * a particular stakind, such as most_common_vals and most_common_freqs for
107 : * STATISTIC_KIND_MCV.
108 : *
109 : * If a problem is found, emit a WARNING, and return false. Otherwise return
110 : * true.
111 : */
112 : bool
113 2064 : stats_check_arg_pair(FunctionCallInfo fcinfo,
114 : struct StatsArgInfo *arginfo,
115 : int argnum1, int argnum2)
116 : {
117 2064 : if (PG_ARGISNULL(argnum1) && PG_ARGISNULL(argnum2))
118 1689 : return true;
119 :
120 375 : if (PG_ARGISNULL(argnum1) || PG_ARGISNULL(argnum2))
121 : {
122 21 : int nullarg = PG_ARGISNULL(argnum1) ? argnum1 : argnum2;
123 21 : int otherarg = PG_ARGISNULL(argnum1) ? argnum2 : argnum1;
124 :
125 21 : ereport(WARNING,
126 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
127 : errmsg("argument \"%s\" must be specified when argument \"%s\" is specified",
128 : arginfo[nullarg].argname,
129 : arginfo[otherarg].argname)));
130 :
131 21 : return false;
132 : }
133 :
134 354 : return true;
135 : }
136 :
137 : /*
138 : * A role has privileges to set statistics on the relation if any of the
139 : * following are true:
140 : * - the role owns the current database and the relation is not shared
141 : * - the role has the MAINTAIN privilege on the relation
142 : */
143 : void
144 1924 : RangeVarCallbackForStats(const RangeVar *relation,
145 : Oid relId, Oid oldRelId, void *arg)
146 : {
147 1924 : Oid *locked_oid = (Oid *) arg;
148 1924 : Oid table_oid = relId;
149 : HeapTuple tuple;
150 : Form_pg_class form;
151 : char relkind;
152 :
153 : /*
154 : * If we previously locked some other index's heap, and the name we're
155 : * looking up no longer refers to that relation, release the now-useless
156 : * lock.
157 : */
158 1924 : if (relId != oldRelId && OidIsValid(*locked_oid))
159 : {
160 0 : UnlockRelationOid(*locked_oid, ShareUpdateExclusiveLock);
161 0 : *locked_oid = InvalidOid;
162 : }
163 :
164 : /* If the relation does not exist, there's nothing more to do. */
165 1924 : if (!OidIsValid(relId))
166 12 : return;
167 :
168 : /* If the relation does exist, check whether it's an index. */
169 1912 : relkind = get_rel_relkind(relId);
170 1912 : if (relkind == RELKIND_INDEX ||
171 : relkind == RELKIND_PARTITIONED_INDEX)
172 301 : table_oid = IndexGetRelation(relId, false);
173 :
174 : /*
175 : * If retrying yields the same OID, there are a couple of extremely
176 : * unlikely scenarios we need to handle.
177 : */
178 1912 : if (relId == oldRelId)
179 : {
180 : /*
181 : * If a previous lookup found an index, but the current lookup did
182 : * not, the index was dropped and the OID was reused for something
183 : * else between lookups. In theory, we could simply drop our lock on
184 : * the index's parent table and proceed, but in the interest of
185 : * avoiding complexity, we just error.
186 : */
187 3 : if (table_oid == relId && OidIsValid(*locked_oid))
188 0 : ereport(ERROR,
189 : (errcode(ERRCODE_UNDEFINED_OBJECT),
190 : errmsg("index \"%s\" was concurrently dropped",
191 : relation->relname)));
192 :
193 : /*
194 : * If the current lookup found an index but a previous lookup either
195 : * did not find an index or found one with a different parent
196 : * relation, the relation was dropped and the OID was reused for an
197 : * index between lookups. RangeVarGetRelidExtended() will have
198 : * already locked the index at this point, so we can't just lock the
199 : * newly discovered parent table OID without risking deadlock. As
200 : * above, we just error in this case.
201 : */
202 3 : if (table_oid != relId && table_oid != *locked_oid)
203 0 : ereport(ERROR,
204 : (errcode(ERRCODE_UNDEFINED_OBJECT),
205 : errmsg("index \"%s\" was concurrently created",
206 : relation->relname)));
207 : }
208 :
209 1912 : tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(table_oid));
210 1912 : if (!HeapTupleIsValid(tuple))
211 0 : elog(ERROR, "cache lookup failed for OID %u", table_oid);
212 1912 : form = (Form_pg_class) GETSTRUCT(tuple);
213 :
214 : /* the relkinds that can be used with ANALYZE */
215 1912 : switch (form->relkind)
216 : {
217 1903 : case RELKIND_RELATION:
218 : case RELKIND_MATVIEW:
219 : case RELKIND_FOREIGN_TABLE:
220 : case RELKIND_PARTITIONED_TABLE:
221 1903 : break;
222 9 : default:
223 9 : ereport(ERROR,
224 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
225 : errmsg("cannot modify statistics for relation \"%s\"",
226 : NameStr(form->relname)),
227 : errdetail_relkind_not_supported(form->relkind)));
228 : }
229 :
230 1903 : if (form->relisshared)
231 0 : ereport(ERROR,
232 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
233 : errmsg("cannot modify statistics for shared relation")));
234 :
235 : /* Check permissions */
236 1903 : if (!object_ownercheck(DatabaseRelationId, MyDatabaseId, GetUserId()))
237 : {
238 12 : AclResult aclresult = pg_class_aclcheck(table_oid,
239 : GetUserId(),
240 : ACL_MAINTAIN);
241 :
242 12 : if (aclresult != ACLCHECK_OK)
243 6 : aclcheck_error(aclresult,
244 6 : get_relkind_objtype(form->relkind),
245 6 : NameStr(form->relname));
246 : }
247 :
248 1897 : ReleaseSysCache(tuple);
249 :
250 : /* Lock heap before index to avoid deadlock. */
251 1897 : if (relId != oldRelId && table_oid != relId)
252 : {
253 300 : LockRelationOid(table_oid, ShareUpdateExclusiveLock);
254 300 : *locked_oid = table_oid;
255 : }
256 : }
257 :
258 :
259 : /*
260 : * Find the argument number for the given argument name, returning -1 if not
261 : * found.
262 : */
263 : static int
264 13591 : get_arg_by_name(const char *argname, struct StatsArgInfo *arginfo)
265 : {
266 : int argnum;
267 :
268 64959 : for (argnum = 0; arginfo[argnum].argname != NULL; argnum++)
269 64953 : if (pg_strcasecmp(argname, arginfo[argnum].argname) == 0)
270 13585 : return argnum;
271 :
272 6 : ereport(WARNING,
273 : (errmsg("unrecognized argument name: \"%s\"", argname)));
274 :
275 6 : return -1;
276 : }
277 :
278 : /*
279 : * Ensure that a given argument matched the expected type.
280 : */
281 : static bool
282 13585 : stats_check_arg_type(const char *argname, Oid argtype, Oid expectedtype)
283 : {
284 13585 : if (argtype != expectedtype)
285 : {
286 12 : ereport(WARNING,
287 : (errmsg("argument \"%s\" has type %s, expected type %s",
288 : argname, format_type_be(argtype),
289 : format_type_be(expectedtype))));
290 12 : return false;
291 : }
292 :
293 13573 : return true;
294 : }
295 :
296 : /*
297 : * Check if attribute of an index is an expression, then retrieve the
298 : * expression if is it the case.
299 : *
300 : * If the attnum specified is known to be an expression, then we must
301 : * walk the list attributes up to the specified attnum to get the right
302 : * expression.
303 : */
304 : static Node *
305 688 : statatt_get_index_expr(Relation rel, int attnum)
306 : {
307 : List *index_exprs;
308 : ListCell *indexpr_item;
309 :
310 : /* relation is not an index */
311 688 : if (rel->rd_rel->relkind != RELKIND_INDEX &&
312 681 : rel->rd_rel->relkind != RELKIND_PARTITIONED_INDEX)
313 681 : return NULL;
314 :
315 7 : index_exprs = RelationGetIndexExpressions(rel);
316 :
317 : /* index has no expressions to give */
318 7 : if (index_exprs == NIL)
319 0 : return NULL;
320 :
321 : /*
322 : * The index's attnum points directly to a relation attnum, hence it is
323 : * not an expression attribute.
324 : */
325 7 : if (rel->rd_index->indkey.values[attnum - 1] != 0)
326 0 : return NULL;
327 :
328 7 : indexpr_item = list_head(rel->rd_indexprs);
329 :
330 7 : for (int i = 0; i < attnum - 1; i++)
331 0 : if (rel->rd_index->indkey.values[i] == 0)
332 0 : indexpr_item = lnext(rel->rd_indexprs, indexpr_item);
333 :
334 7 : if (indexpr_item == NULL) /* shouldn't happen */
335 0 : elog(ERROR, "too few entries in indexprs list");
336 :
337 7 : return (Node *) lfirst(indexpr_item);
338 : }
339 :
340 : /*
341 : * Translate variadic argument pairs from 'pairs_fcinfo' into a
342 : * 'positional_fcinfo' appropriate for calling relation_statistics_update() or
343 : * attribute_statistics_update() with positional arguments.
344 : *
345 : * Caller should have already initialized positional_fcinfo with a size
346 : * appropriate for calling the intended positional function, and arginfo
347 : * should also match the intended positional function.
348 : */
349 : bool
350 1930 : stats_fill_fcinfo_from_arg_pairs(FunctionCallInfo pairs_fcinfo,
351 : FunctionCallInfo positional_fcinfo,
352 : struct StatsArgInfo *arginfo)
353 : {
354 : Datum *args;
355 : bool *argnulls;
356 : Oid *types;
357 : int nargs;
358 1930 : bool result = true;
359 :
360 : /* clear positional args */
361 22586 : for (int i = 0; arginfo[i].argname != NULL; i++)
362 : {
363 20656 : positional_fcinfo->args[i].value = (Datum) 0;
364 20656 : positional_fcinfo->args[i].isnull = true;
365 : }
366 :
367 1930 : nargs = extract_variadic_args(pairs_fcinfo, 0, true,
368 : &args, &types, &argnulls);
369 :
370 1930 : if (nargs % 2 != 0)
371 3 : ereport(ERROR,
372 : errmsg("variadic arguments must be name/value pairs"),
373 : errhint("Provide an even number of variadic arguments that can be divided into pairs."));
374 :
375 : /*
376 : * For each argument name/value pair, find corresponding positional
377 : * argument for the argument name, and assign the argument value to
378 : * positional_fcinfo.
379 : */
380 17340 : for (int i = 0; i < nargs; i += 2)
381 : {
382 : int argnum;
383 : char *argname;
384 :
385 15416 : if (argnulls[i])
386 3 : ereport(ERROR,
387 : (errmsg("name at variadic position %d is null", i + 1)));
388 :
389 15413 : if (types[i] != TEXTOID)
390 0 : ereport(ERROR,
391 : (errmsg("name at variadic position %d has type %s, expected type %s",
392 : i + 1, format_type_be(types[i]),
393 : format_type_be(TEXTOID))));
394 :
395 15413 : if (argnulls[i + 1])
396 153 : continue;
397 :
398 15260 : argname = TextDatumGetCString(args[i]);
399 :
400 : /*
401 : * The 'version' argument is a special case, not handled by arginfo
402 : * because it's not a valid positional argument.
403 : *
404 : * For now, 'version' is accepted but ignored. In the future it can be
405 : * used to interpret older statistics properly.
406 : */
407 15260 : if (pg_strcasecmp(argname, "version") == 0)
408 1669 : continue;
409 :
410 13591 : argnum = get_arg_by_name(argname, arginfo);
411 :
412 27176 : if (argnum < 0 || !stats_check_arg_type(argname, types[i + 1],
413 13585 : arginfo[argnum].argtype))
414 : {
415 18 : result = false;
416 18 : continue;
417 : }
418 :
419 13573 : positional_fcinfo->args[argnum].value = args[i + 1];
420 13573 : positional_fcinfo->args[argnum].isnull = false;
421 : }
422 :
423 1924 : return result;
424 : }
425 :
426 : /*
427 : * Derive type information from a relation attribute.
428 : *
429 : * This is needed for setting most slot statistics for all data types.
430 : *
431 : * This duplicates the logic in examine_attribute() but it will not skip the
432 : * attribute if the attstattarget is 0.
433 : *
434 : * This information, retrieved from pg_attribute and pg_type with some
435 : * specific handling for index expressions, is a prerequisite to calling
436 : * any of the other statatt_*() functions.
437 : */
438 : void
439 688 : statatt_get_type(Oid reloid, AttrNumber attnum,
440 : Oid *atttypid, int32 *atttypmod,
441 : char *atttyptype, Oid *atttypcoll,
442 : Oid *eq_opr, Oid *lt_opr)
443 : {
444 688 : Relation rel = relation_open(reloid, AccessShareLock);
445 : Form_pg_attribute attr;
446 : HeapTuple atup;
447 : Node *expr;
448 : TypeCacheEntry *typcache;
449 :
450 688 : atup = SearchSysCache2(ATTNUM, ObjectIdGetDatum(reloid),
451 : Int16GetDatum(attnum));
452 :
453 : /* Attribute not found */
454 688 : if (!HeapTupleIsValid(atup))
455 0 : ereport(ERROR,
456 : (errcode(ERRCODE_UNDEFINED_COLUMN),
457 : errmsg("column %d of relation \"%s\" does not exist",
458 : attnum, RelationGetRelationName(rel))));
459 :
460 688 : attr = (Form_pg_attribute) GETSTRUCT(atup);
461 :
462 688 : if (attr->attisdropped)
463 0 : ereport(ERROR,
464 : (errcode(ERRCODE_UNDEFINED_COLUMN),
465 : errmsg("column %d of relation \"%s\" does not exist",
466 : attnum, RelationGetRelationName(rel))));
467 :
468 688 : expr = statatt_get_index_expr(rel, attr->attnum);
469 :
470 : /*
471 : * When analyzing an expression index, believe the expression tree's type
472 : * not the column datatype --- the latter might be the opckeytype storage
473 : * type of the opclass, which is not interesting for our purposes. This
474 : * mimics the behavior of examine_attribute().
475 : */
476 688 : if (expr == NULL)
477 : {
478 681 : *atttypid = attr->atttypid;
479 681 : *atttypmod = attr->atttypmod;
480 681 : *atttypcoll = attr->attcollation;
481 : }
482 : else
483 : {
484 7 : *atttypid = exprType(expr);
485 7 : *atttypmod = exprTypmod(expr);
486 :
487 7 : if (OidIsValid(attr->attcollation))
488 0 : *atttypcoll = attr->attcollation;
489 : else
490 7 : *atttypcoll = exprCollation(expr);
491 : }
492 688 : ReleaseSysCache(atup);
493 :
494 : /*
495 : * If it's a multirange, step down to the range type, as is done by
496 : * multirange_typanalyze().
497 : */
498 688 : if (type_is_multirange(*atttypid))
499 4 : *atttypid = get_multirange_range(*atttypid);
500 :
501 : /* finds the right operators even if atttypid is a domain */
502 688 : typcache = lookup_type_cache(*atttypid, TYPECACHE_LT_OPR | TYPECACHE_EQ_OPR);
503 688 : *atttyptype = typcache->typtype;
504 688 : *eq_opr = typcache->eq_opr;
505 688 : *lt_opr = typcache->lt_opr;
506 :
507 : /*
508 : * Special case: collation for tsvector is DEFAULT_COLLATION_OID. See
509 : * compute_tsvector_stats().
510 : */
511 688 : if (*atttypid == TSVECTOROID)
512 1 : *atttypcoll = DEFAULT_COLLATION_OID;
513 :
514 688 : relation_close(rel, NoLock);
515 688 : }
516 :
517 : /*
518 : * Derive element type information from the attribute type. This information
519 : * is needed when the given type is one that contains elements of other types.
520 : *
521 : * The atttypid and atttyptype should be derived from a previous call to
522 : * statatt_get_type().
523 : */
524 : bool
525 26 : statatt_get_elem_type(Oid atttypid, char atttyptype,
526 : Oid *elemtypid, Oid *elem_eq_opr)
527 : {
528 : TypeCacheEntry *elemtypcache;
529 :
530 26 : if (atttypid == TSVECTOROID)
531 : {
532 : /*
533 : * Special case: element type for tsvector is text. See
534 : * compute_tsvector_stats().
535 : */
536 1 : *elemtypid = TEXTOID;
537 : }
538 : else
539 : {
540 : /* find underlying element type through any domain */
541 25 : *elemtypid = get_base_element_type(atttypid);
542 : }
543 :
544 26 : if (!OidIsValid(*elemtypid))
545 9 : return false;
546 :
547 : /* finds the right operator even if elemtypid is a domain */
548 17 : elemtypcache = lookup_type_cache(*elemtypid, TYPECACHE_EQ_OPR);
549 17 : if (!OidIsValid(elemtypcache->eq_opr))
550 0 : return false;
551 :
552 17 : *elem_eq_opr = elemtypcache->eq_opr;
553 :
554 17 : return true;
555 : }
556 :
557 : /*
558 : * Build an array with element type elemtypid from a text datum, used as
559 : * value of an attribute in a tuple to-be-inserted into pg_statistic.
560 : *
561 : * The typid and typmod should be derived from a previous call to
562 : * statatt_get_type().
563 : *
564 : * If an error is encountered, capture it and throw a WARNING, with "ok" set
565 : * to false. If the resulting array contains NULLs, raise a WARNING and
566 : * set "ok" to false. When the operation succeeds, set "ok" to true.
567 : */
568 : Datum
569 665 : statatt_build_stavalues(const char *staname, FmgrInfo *array_in, Datum d, Oid typid,
570 : int32 typmod, bool *ok)
571 : {
572 665 : LOCAL_FCINFO(fcinfo, 8);
573 : char *s;
574 : Datum result;
575 665 : ErrorSaveContext escontext = {T_ErrorSaveContext};
576 :
577 665 : escontext.details_wanted = true;
578 :
579 665 : s = TextDatumGetCString(d);
580 :
581 665 : InitFunctionCallInfoData(*fcinfo, array_in, 3, InvalidOid,
582 : (Node *) &escontext, NULL);
583 :
584 665 : fcinfo->args[0].value = CStringGetDatum(s);
585 665 : fcinfo->args[0].isnull = false;
586 665 : fcinfo->args[1].value = ObjectIdGetDatum(typid);
587 665 : fcinfo->args[1].isnull = false;
588 665 : fcinfo->args[2].value = Int32GetDatum(typmod);
589 665 : fcinfo->args[2].isnull = false;
590 :
591 665 : result = FunctionCallInvoke(fcinfo);
592 :
593 665 : pfree(s);
594 :
595 665 : if (escontext.error_occurred)
596 : {
597 3 : escontext.error_data->elevel = WARNING;
598 3 : ThrowErrorData(escontext.error_data);
599 3 : *ok = false;
600 3 : return (Datum) 0;
601 : }
602 :
603 662 : if (array_contains_nulls(DatumGetArrayTypeP(result)))
604 : {
605 3 : ereport(WARNING,
606 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
607 : errmsg("\"%s\" array must not contain null values", staname)));
608 3 : *ok = false;
609 3 : return (Datum) 0;
610 : }
611 :
612 659 : *ok = true;
613 :
614 659 : return result;
615 : }
616 :
617 : /*
618 : * Find and update the slot of a stakind, or use the first empty slot.
619 : *
620 : * Core statistics types expect the stakind value to be one of the
621 : * STATISTIC_KIND_* constants defined in pg_statistic.h, but types defined
622 : * by extensions are not restricted to those values.
623 : *
624 : * In the case of core statistics, the required staop is determined by the
625 : * stakind given and will either be a hardcoded oid, or the eq/lt operator
626 : * derived from statatt_get_type(). Likewise, types defined by extensions
627 : * have no such restriction.
628 : *
629 : * The stacoll value should be either the atttypcoll derived from
630 : * statatt_get_type(), or a hardcoded value required by that particular
631 : * stakind.
632 : *
633 : * The value/null pairs for stanumbers and stavalues should be calculated
634 : * based on the stakind, using statatt_build_stavalues() or constructed arrays.
635 : */
636 : void
637 1248 : statatt_set_slot(Datum *values, bool *nulls, bool *replaces,
638 : int16 stakind, Oid staop, Oid stacoll,
639 : Datum stanumbers, bool stanumbers_isnull,
640 : Datum stavalues, bool stavalues_isnull)
641 : {
642 : int slotidx;
643 1248 : int first_empty = -1;
644 : AttrNumber stakind_attnum;
645 : AttrNumber staop_attnum;
646 : AttrNumber stacoll_attnum;
647 :
648 : /* find existing slot with given stakind */
649 7488 : for (slotidx = 0; slotidx < STATISTIC_NUM_SLOTS; slotidx++)
650 : {
651 6240 : stakind_attnum = Anum_pg_statistic_stakind1 - 1 + slotidx;
652 :
653 8210 : if (first_empty < 0 &&
654 1970 : DatumGetInt16(values[stakind_attnum]) == 0)
655 1248 : first_empty = slotidx;
656 6240 : if (DatumGetInt16(values[stakind_attnum]) == stakind)
657 0 : break;
658 : }
659 :
660 1248 : if (slotidx >= STATISTIC_NUM_SLOTS && first_empty >= 0)
661 1248 : slotidx = first_empty;
662 :
663 1248 : if (slotidx >= STATISTIC_NUM_SLOTS)
664 0 : ereport(ERROR,
665 : (errmsg("maximum number of statistics slots exceeded: %d",
666 : slotidx + 1)));
667 :
668 1248 : stakind_attnum = Anum_pg_statistic_stakind1 - 1 + slotidx;
669 1248 : staop_attnum = Anum_pg_statistic_staop1 - 1 + slotidx;
670 1248 : stacoll_attnum = Anum_pg_statistic_stacoll1 - 1 + slotidx;
671 :
672 1248 : if (DatumGetInt16(values[stakind_attnum]) != stakind)
673 : {
674 1248 : values[stakind_attnum] = Int16GetDatum(stakind);
675 1248 : replaces[stakind_attnum] = true;
676 : }
677 1248 : if (DatumGetObjectId(values[staop_attnum]) != staop)
678 : {
679 1236 : values[staop_attnum] = ObjectIdGetDatum(staop);
680 1236 : replaces[staop_attnum] = true;
681 : }
682 1248 : if (DatumGetObjectId(values[stacoll_attnum]) != stacoll)
683 : {
684 322 : values[stacoll_attnum] = ObjectIdGetDatum(stacoll);
685 322 : replaces[stacoll_attnum] = true;
686 : }
687 1248 : if (!stanumbers_isnull)
688 : {
689 931 : values[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = stanumbers;
690 931 : nulls[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = false;
691 931 : replaces[Anum_pg_statistic_stanumbers1 - 1 + slotidx] = true;
692 : }
693 1248 : if (!stavalues_isnull)
694 : {
695 659 : values[Anum_pg_statistic_stavalues1 - 1 + slotidx] = stavalues;
696 659 : nulls[Anum_pg_statistic_stavalues1 - 1 + slotidx] = false;
697 659 : replaces[Anum_pg_statistic_stavalues1 - 1 + slotidx] = true;
698 : }
699 1248 : }
700 :
701 : /*
702 : * Initialize values and nulls for a new pg_statistic tuple.
703 : *
704 : * The caller is responsible for allocating the arrays where the results are
705 : * stored, which should be of size Natts_pg_statistic.
706 : *
707 : * When using this routine for a tuple inserted into pg_statistic, reloid,
708 : * attnum and inherited flags should all be set.
709 : *
710 : * When using this routine for a tuple that is an element of a stxdexpr
711 : * array inserted into pg_statistic_ext_data, reloid, attnum and inherited
712 : * should be respectively set to InvalidOid, InvalidAttrNumber and false.
713 : */
714 : void
715 625 : statatt_init_empty_tuple(Oid reloid, int16 attnum, bool inherited,
716 : Datum *values, bool *nulls, bool *replaces)
717 : {
718 625 : memset(nulls, true, sizeof(bool) * Natts_pg_statistic);
719 625 : memset(replaces, true, sizeof(bool) * Natts_pg_statistic);
720 :
721 : /* This must initialize non-NULL attributes */
722 625 : values[Anum_pg_statistic_starelid - 1] = ObjectIdGetDatum(reloid);
723 625 : nulls[Anum_pg_statistic_starelid - 1] = false;
724 625 : values[Anum_pg_statistic_staattnum - 1] = Int16GetDatum(attnum);
725 625 : nulls[Anum_pg_statistic_staattnum - 1] = false;
726 625 : values[Anum_pg_statistic_stainherit - 1] = BoolGetDatum(inherited);
727 625 : nulls[Anum_pg_statistic_stainherit - 1] = false;
728 :
729 625 : values[Anum_pg_statistic_stanullfrac - 1] = DEFAULT_STATATT_NULL_FRAC;
730 625 : nulls[Anum_pg_statistic_stanullfrac - 1] = false;
731 625 : values[Anum_pg_statistic_stawidth - 1] = DEFAULT_STATATT_AVG_WIDTH;
732 625 : nulls[Anum_pg_statistic_stawidth - 1] = false;
733 625 : values[Anum_pg_statistic_stadistinct - 1] = DEFAULT_STATATT_N_DISTINCT;
734 625 : nulls[Anum_pg_statistic_stadistinct - 1] = false;
735 :
736 : /* initialize stakind, staop, and stacoll slots */
737 3750 : for (int slotnum = 0; slotnum < STATISTIC_NUM_SLOTS; slotnum++)
738 : {
739 3125 : values[Anum_pg_statistic_stakind1 + slotnum - 1] = (Datum) 0;
740 3125 : nulls[Anum_pg_statistic_stakind1 + slotnum - 1] = false;
741 3125 : values[Anum_pg_statistic_staop1 + slotnum - 1] = ObjectIdGetDatum(InvalidOid);
742 3125 : nulls[Anum_pg_statistic_staop1 + slotnum - 1] = false;
743 3125 : values[Anum_pg_statistic_stacoll1 + slotnum - 1] = ObjectIdGetDatum(InvalidOid);
744 3125 : nulls[Anum_pg_statistic_stacoll1 + slotnum - 1] = false;
745 : }
746 625 : }
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