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enum.c
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1 /*-------------------------------------------------------------------------
2  *
3  * enum.c
4  * I/O functions, operators, aggregates etc for enum types
5  *
6  * Copyright (c) 2006-2021, PostgreSQL Global Development Group
7  *
8  *
9  * IDENTIFICATION
10  * src/backend/utils/adt/enum.c
11  *
12  *-------------------------------------------------------------------------
13  */
14 #include "postgres.h"
15 
16 #include "access/genam.h"
17 #include "access/htup_details.h"
18 #include "access/table.h"
19 #include "catalog/pg_enum.h"
20 #include "libpq/pqformat.h"
21 #include "storage/procarray.h"
22 #include "utils/array.h"
23 #include "utils/builtins.h"
24 #include "utils/fmgroids.h"
25 #include "utils/snapmgr.h"
26 #include "utils/syscache.h"
27 #include "utils/typcache.h"
28 
29 
30 static Oid enum_endpoint(Oid enumtypoid, ScanDirection direction);
31 static ArrayType *enum_range_internal(Oid enumtypoid, Oid lower, Oid upper);
32 
33 
34 /*
35  * Disallow use of an uncommitted pg_enum tuple.
36  *
37  * We need to make sure that uncommitted enum values don't get into indexes.
38  * If they did, and if we then rolled back the pg_enum addition, we'd have
39  * broken the index because value comparisons will not work reliably without
40  * an underlying pg_enum entry. (Note that removal of the heap entry
41  * containing an enum value is not sufficient to ensure that it doesn't appear
42  * in upper levels of indexes.) To do this we prevent an uncommitted row from
43  * being used for any SQL-level purpose. This is stronger than necessary,
44  * since the value might not be getting inserted into a table or there might
45  * be no index on its column, but it's easy to enforce centrally.
46  *
47  * However, it's okay to allow use of uncommitted values belonging to enum
48  * types that were themselves created in the same transaction, because then
49  * any such index would also be new and would go away altogether on rollback.
50  * We don't implement that fully right now, but we do allow free use of enum
51  * values created during CREATE TYPE AS ENUM, which are surely of the same
52  * lifespan as the enum type. (This case is required by "pg_restore -1".)
53  * Values added by ALTER TYPE ADD VALUE are currently restricted, but could
54  * be allowed if the enum type could be proven to have been created earlier
55  * in the same transaction. (Note that comparing tuple xmins would not work
56  * for that, because the type tuple might have been updated in the current
57  * transaction. Subtransactions also create hazards to be accounted for.)
58  *
59  * This function needs to be called (directly or indirectly) in any of the
60  * functions below that could return an enum value to SQL operations.
61  */
62 static void
64 {
65  TransactionId xmin;
66  Form_pg_enum en = (Form_pg_enum) GETSTRUCT(enumval_tup);
67 
68  /*
69  * If the row is hinted as committed, it's surely safe. This provides a
70  * fast path for all normal use-cases.
71  */
72  if (HeapTupleHeaderXminCommitted(enumval_tup->t_data))
73  return;
74 
75  /*
76  * Usually, a row would get hinted as committed when it's read or loaded
77  * into syscache; but just in case not, let's check the xmin directly.
78  */
79  xmin = HeapTupleHeaderGetXmin(enumval_tup->t_data);
80  if (!TransactionIdIsInProgress(xmin) &&
82  return;
83 
84  /*
85  * Check if the enum value is uncommitted. If not, it's safe, because it
86  * was made during CREATE TYPE AS ENUM and can't be shorter-lived than its
87  * owning type. (This'd also be false for values made by other
88  * transactions; but the previous tests should have handled all of those.)
89  */
90  if (!EnumUncommitted(en->oid))
91  return;
92 
93  /*
94  * There might well be other tests we could do here to narrow down the
95  * unsafe conditions, but for now just raise an exception.
96  */
97  ereport(ERROR,
98  (errcode(ERRCODE_UNSAFE_NEW_ENUM_VALUE_USAGE),
99  errmsg("unsafe use of new value \"%s\" of enum type %s",
100  NameStr(en->enumlabel),
101  format_type_be(en->enumtypid)),
102  errhint("New enum values must be committed before they can be used.")));
103 }
104 
105 
106 /* Basic I/O support */
107 
108 Datum
110 {
111  char *name = PG_GETARG_CSTRING(0);
112  Oid enumtypoid = PG_GETARG_OID(1);
113  Oid enumoid;
114  HeapTuple tup;
115 
116  /* must check length to prevent Assert failure within SearchSysCache */
117  if (strlen(name) >= NAMEDATALEN)
118  ereport(ERROR,
119  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
120  errmsg("invalid input value for enum %s: \"%s\"",
121  format_type_be(enumtypoid),
122  name)));
123 
125  ObjectIdGetDatum(enumtypoid),
126  CStringGetDatum(name));
127  if (!HeapTupleIsValid(tup))
128  ereport(ERROR,
129  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
130  errmsg("invalid input value for enum %s: \"%s\"",
131  format_type_be(enumtypoid),
132  name)));
133 
134  /* check it's safe to use in SQL */
135  check_safe_enum_use(tup);
136 
137  /*
138  * This comes from pg_enum.oid and stores system oids in user tables. This
139  * oid must be preserved by binary upgrades.
140  */
141  enumoid = ((Form_pg_enum) GETSTRUCT(tup))->oid;
142 
143  ReleaseSysCache(tup);
144 
145  PG_RETURN_OID(enumoid);
146 }
147 
148 Datum
150 {
151  Oid enumval = PG_GETARG_OID(0);
152  char *result;
153  HeapTuple tup;
154  Form_pg_enum en;
155 
156  tup = SearchSysCache1(ENUMOID, ObjectIdGetDatum(enumval));
157  if (!HeapTupleIsValid(tup))
158  ereport(ERROR,
159  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
160  errmsg("invalid internal value for enum: %u",
161  enumval)));
162  en = (Form_pg_enum) GETSTRUCT(tup);
163 
164  result = pstrdup(NameStr(en->enumlabel));
165 
166  ReleaseSysCache(tup);
167 
168  PG_RETURN_CSTRING(result);
169 }
170 
171 /* Binary I/O support */
172 Datum
174 {
176  Oid enumtypoid = PG_GETARG_OID(1);
177  Oid enumoid;
178  HeapTuple tup;
179  char *name;
180  int nbytes;
181 
182  name = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
183 
184  /* must check length to prevent Assert failure within SearchSysCache */
185  if (strlen(name) >= NAMEDATALEN)
186  ereport(ERROR,
187  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
188  errmsg("invalid input value for enum %s: \"%s\"",
189  format_type_be(enumtypoid),
190  name)));
191 
193  ObjectIdGetDatum(enumtypoid),
194  CStringGetDatum(name));
195  if (!HeapTupleIsValid(tup))
196  ereport(ERROR,
197  (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
198  errmsg("invalid input value for enum %s: \"%s\"",
199  format_type_be(enumtypoid),
200  name)));
201 
202  /* check it's safe to use in SQL */
203  check_safe_enum_use(tup);
204 
205  enumoid = ((Form_pg_enum) GETSTRUCT(tup))->oid;
206 
207  ReleaseSysCache(tup);
208 
209  pfree(name);
210 
211  PG_RETURN_OID(enumoid);
212 }
213 
214 Datum
216 {
217  Oid enumval = PG_GETARG_OID(0);
219  HeapTuple tup;
220  Form_pg_enum en;
221 
222  tup = SearchSysCache1(ENUMOID, ObjectIdGetDatum(enumval));
223  if (!HeapTupleIsValid(tup))
224  ereport(ERROR,
225  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
226  errmsg("invalid internal value for enum: %u",
227  enumval)));
228  en = (Form_pg_enum) GETSTRUCT(tup);
229 
230  pq_begintypsend(&buf);
231  pq_sendtext(&buf, NameStr(en->enumlabel), strlen(NameStr(en->enumlabel)));
232 
233  ReleaseSysCache(tup);
234 
236 }
237 
238 /* Comparison functions and related */
239 
240 /*
241  * enum_cmp_internal is the common engine for all the visible comparison
242  * functions, except for enum_eq and enum_ne which can just check for OID
243  * equality directly.
244  */
245 static int
247 {
248  TypeCacheEntry *tcache;
249 
250  /*
251  * We don't need the typcache except in the hopefully-uncommon case that
252  * one or both Oids are odd. This means that cursory testing of code that
253  * fails to pass flinfo to an enum comparison function might not disclose
254  * the oversight. To make such errors more obvious, Assert that we have a
255  * place to cache even when we take a fast-path exit.
256  */
257  Assert(fcinfo->flinfo != NULL);
258 
259  /* Equal OIDs are equal no matter what */
260  if (arg1 == arg2)
261  return 0;
262 
263  /* Fast path: even-numbered Oids are known to compare correctly */
264  if ((arg1 & 1) == 0 && (arg2 & 1) == 0)
265  {
266  if (arg1 < arg2)
267  return -1;
268  else
269  return 1;
270  }
271 
272  /* Locate the typcache entry for the enum type */
273  tcache = (TypeCacheEntry *) fcinfo->flinfo->fn_extra;
274  if (tcache == NULL)
275  {
276  HeapTuple enum_tup;
277  Form_pg_enum en;
278  Oid typeoid;
279 
280  /* Get the OID of the enum type containing arg1 */
281  enum_tup = SearchSysCache1(ENUMOID, ObjectIdGetDatum(arg1));
282  if (!HeapTupleIsValid(enum_tup))
283  ereport(ERROR,
284  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
285  errmsg("invalid internal value for enum: %u",
286  arg1)));
287  en = (Form_pg_enum) GETSTRUCT(enum_tup);
288  typeoid = en->enumtypid;
289  ReleaseSysCache(enum_tup);
290  /* Now locate and remember the typcache entry */
291  tcache = lookup_type_cache(typeoid, 0);
292  fcinfo->flinfo->fn_extra = (void *) tcache;
293  }
294 
295  /* The remaining comparison logic is in typcache.c */
296  return compare_values_of_enum(tcache, arg1, arg2);
297 }
298 
299 Datum
301 {
302  Oid a = PG_GETARG_OID(0);
303  Oid b = PG_GETARG_OID(1);
304 
305  PG_RETURN_BOOL(enum_cmp_internal(a, b, fcinfo) < 0);
306 }
307 
308 Datum
310 {
311  Oid a = PG_GETARG_OID(0);
312  Oid b = PG_GETARG_OID(1);
313 
314  PG_RETURN_BOOL(enum_cmp_internal(a, b, fcinfo) <= 0);
315 }
316 
317 Datum
319 {
320  Oid a = PG_GETARG_OID(0);
321  Oid b = PG_GETARG_OID(1);
322 
323  PG_RETURN_BOOL(a == b);
324 }
325 
326 Datum
328 {
329  Oid a = PG_GETARG_OID(0);
330  Oid b = PG_GETARG_OID(1);
331 
332  PG_RETURN_BOOL(a != b);
333 }
334 
335 Datum
337 {
338  Oid a = PG_GETARG_OID(0);
339  Oid b = PG_GETARG_OID(1);
340 
341  PG_RETURN_BOOL(enum_cmp_internal(a, b, fcinfo) >= 0);
342 }
343 
344 Datum
346 {
347  Oid a = PG_GETARG_OID(0);
348  Oid b = PG_GETARG_OID(1);
349 
350  PG_RETURN_BOOL(enum_cmp_internal(a, b, fcinfo) > 0);
351 }
352 
353 Datum
355 {
356  Oid a = PG_GETARG_OID(0);
357  Oid b = PG_GETARG_OID(1);
358 
359  PG_RETURN_OID(enum_cmp_internal(a, b, fcinfo) < 0 ? a : b);
360 }
361 
362 Datum
364 {
365  Oid a = PG_GETARG_OID(0);
366  Oid b = PG_GETARG_OID(1);
367 
368  PG_RETURN_OID(enum_cmp_internal(a, b, fcinfo) > 0 ? a : b);
369 }
370 
371 Datum
373 {
374  Oid a = PG_GETARG_OID(0);
375  Oid b = PG_GETARG_OID(1);
376 
377  PG_RETURN_INT32(enum_cmp_internal(a, b, fcinfo));
378 }
379 
380 /* Enum programming support functions */
381 
382 /*
383  * enum_endpoint: common code for enum_first/enum_last
384  */
385 static Oid
386 enum_endpoint(Oid enumtypoid, ScanDirection direction)
387 {
388  Relation enum_rel;
389  Relation enum_idx;
390  SysScanDesc enum_scan;
391  HeapTuple enum_tuple;
392  ScanKeyData skey;
393  Oid minmax;
394 
395  /*
396  * Find the first/last enum member using pg_enum_typid_sortorder_index.
397  * Note we must not use the syscache. See comments for RenumberEnumType
398  * in catalog/pg_enum.c for more info.
399  */
400  ScanKeyInit(&skey,
401  Anum_pg_enum_enumtypid,
402  BTEqualStrategyNumber, F_OIDEQ,
403  ObjectIdGetDatum(enumtypoid));
404 
405  enum_rel = table_open(EnumRelationId, AccessShareLock);
406  enum_idx = index_open(EnumTypIdSortOrderIndexId, AccessShareLock);
407  enum_scan = systable_beginscan_ordered(enum_rel, enum_idx, NULL,
408  1, &skey);
409 
410  enum_tuple = systable_getnext_ordered(enum_scan, direction);
411  if (HeapTupleIsValid(enum_tuple))
412  {
413  /* check it's safe to use in SQL */
414  check_safe_enum_use(enum_tuple);
415  minmax = ((Form_pg_enum) GETSTRUCT(enum_tuple))->oid;
416  }
417  else
418  {
419  /* should only happen with an empty enum */
420  minmax = InvalidOid;
421  }
422 
423  systable_endscan_ordered(enum_scan);
424  index_close(enum_idx, AccessShareLock);
425  table_close(enum_rel, AccessShareLock);
426 
427  return minmax;
428 }
429 
430 Datum
432 {
433  Oid enumtypoid;
434  Oid min;
435 
436  /*
437  * We rely on being able to get the specific enum type from the calling
438  * expression tree. Notice that the actual value of the argument isn't
439  * examined at all; in particular it might be NULL.
440  */
441  enumtypoid = get_fn_expr_argtype(fcinfo->flinfo, 0);
442  if (enumtypoid == InvalidOid)
443  ereport(ERROR,
444  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
445  errmsg("could not determine actual enum type")));
446 
447  /* Get the OID using the index */
448  min = enum_endpoint(enumtypoid, ForwardScanDirection);
449 
450  if (!OidIsValid(min))
451  ereport(ERROR,
452  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
453  errmsg("enum %s contains no values",
454  format_type_be(enumtypoid))));
455 
456  PG_RETURN_OID(min);
457 }
458 
459 Datum
461 {
462  Oid enumtypoid;
463  Oid max;
464 
465  /*
466  * We rely on being able to get the specific enum type from the calling
467  * expression tree. Notice that the actual value of the argument isn't
468  * examined at all; in particular it might be NULL.
469  */
470  enumtypoid = get_fn_expr_argtype(fcinfo->flinfo, 0);
471  if (enumtypoid == InvalidOid)
472  ereport(ERROR,
473  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
474  errmsg("could not determine actual enum type")));
475 
476  /* Get the OID using the index */
477  max = enum_endpoint(enumtypoid, BackwardScanDirection);
478 
479  if (!OidIsValid(max))
480  ereport(ERROR,
481  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
482  errmsg("enum %s contains no values",
483  format_type_be(enumtypoid))));
484 
485  PG_RETURN_OID(max);
486 }
487 
488 /* 2-argument variant of enum_range */
489 Datum
491 {
492  Oid lower;
493  Oid upper;
494  Oid enumtypoid;
495 
496  if (PG_ARGISNULL(0))
497  lower = InvalidOid;
498  else
499  lower = PG_GETARG_OID(0);
500  if (PG_ARGISNULL(1))
501  upper = InvalidOid;
502  else
503  upper = PG_GETARG_OID(1);
504 
505  /*
506  * We rely on being able to get the specific enum type from the calling
507  * expression tree. The generic type mechanism should have ensured that
508  * both are of the same type.
509  */
510  enumtypoid = get_fn_expr_argtype(fcinfo->flinfo, 0);
511  if (enumtypoid == InvalidOid)
512  ereport(ERROR,
513  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
514  errmsg("could not determine actual enum type")));
515 
516  PG_RETURN_ARRAYTYPE_P(enum_range_internal(enumtypoid, lower, upper));
517 }
518 
519 /* 1-argument variant of enum_range */
520 Datum
522 {
523  Oid enumtypoid;
524 
525  /*
526  * We rely on being able to get the specific enum type from the calling
527  * expression tree. Notice that the actual value of the argument isn't
528  * examined at all; in particular it might be NULL.
529  */
530  enumtypoid = get_fn_expr_argtype(fcinfo->flinfo, 0);
531  if (enumtypoid == InvalidOid)
532  ereport(ERROR,
533  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
534  errmsg("could not determine actual enum type")));
535 
538 }
539 
540 static ArrayType *
542 {
543  ArrayType *result;
544  Relation enum_rel;
545  Relation enum_idx;
546  SysScanDesc enum_scan;
547  HeapTuple enum_tuple;
548  ScanKeyData skey;
549  Datum *elems;
550  int max,
551  cnt;
552  bool left_found;
553 
554  /*
555  * Scan the enum members in order using pg_enum_typid_sortorder_index.
556  * Note we must not use the syscache. See comments for RenumberEnumType
557  * in catalog/pg_enum.c for more info.
558  */
559  ScanKeyInit(&skey,
560  Anum_pg_enum_enumtypid,
561  BTEqualStrategyNumber, F_OIDEQ,
562  ObjectIdGetDatum(enumtypoid));
563 
564  enum_rel = table_open(EnumRelationId, AccessShareLock);
565  enum_idx = index_open(EnumTypIdSortOrderIndexId, AccessShareLock);
566  enum_scan = systable_beginscan_ordered(enum_rel, enum_idx, NULL, 1, &skey);
567 
568  max = 64;
569  elems = (Datum *) palloc(max * sizeof(Datum));
570  cnt = 0;
571  left_found = !OidIsValid(lower);
572 
573  while (HeapTupleIsValid(enum_tuple = systable_getnext_ordered(enum_scan, ForwardScanDirection)))
574  {
575  Oid enum_oid = ((Form_pg_enum) GETSTRUCT(enum_tuple))->oid;
576 
577  if (!left_found && lower == enum_oid)
578  left_found = true;
579 
580  if (left_found)
581  {
582  /* check it's safe to use in SQL */
583  check_safe_enum_use(enum_tuple);
584 
585  if (cnt >= max)
586  {
587  max *= 2;
588  elems = (Datum *) repalloc(elems, max * sizeof(Datum));
589  }
590 
591  elems[cnt++] = ObjectIdGetDatum(enum_oid);
592  }
593 
594  if (OidIsValid(upper) && upper == enum_oid)
595  break;
596  }
597 
598  systable_endscan_ordered(enum_scan);
599  index_close(enum_idx, AccessShareLock);
600  table_close(enum_rel, AccessShareLock);
601 
602  /* and build the result array */
603  /* note this hardwires some details about the representation of Oid */
604  result = construct_array(elems, cnt, enumtypoid,
605  sizeof(Oid), true, TYPALIGN_INT);
606 
607  pfree(elems);
608 
609  return result;
610 }
int compare_values_of_enum(TypeCacheEntry *tcache, Oid arg1, Oid arg2)
Definition: typcache.c:2471
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Definition: table.c:167
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Definition: enum.c:345
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Definition: enum.c:541
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Definition: enum.c:327
Datum enum_first(PG_FUNCTION_ARGS)
Definition: enum.c:431
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ScanDirection
Definition: sdir.h:22
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FormData_pg_enum * Form_pg_enum
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Datum enum_ge(PG_FUNCTION_ARGS)
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void systable_endscan_ordered(SysScanDesc sysscan)
Definition: genam.c:732
TypeCacheEntry * lookup_type_cache(Oid type_id, int flags)
Definition: typcache.c:339
#define InvalidOid
Definition: postgres_ext.h:36
Datum enum_send(PG_FUNCTION_ARGS)
Definition: enum.c:215
#define ereport(elevel,...)
Definition: elog.h:157
#define PG_ARGISNULL(n)
Definition: fmgr.h:209
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
#define Assert(condition)
Definition: c.h:804
Datum enum_cmp(PG_FUNCTION_ARGS)
Definition: enum.c:372
#define HeapTupleHeaderGetXmin(tup)
Definition: htup_details.h:313
#define PG_RETURN_CSTRING(x)
Definition: fmgr.h:362
HeapTuple SearchSysCache2(int cacheId, Datum key1, Datum key2)
Definition: syscache.c:1138
void * fn_extra
Definition: fmgr.h:64
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1182
const char * name
Definition: encode.c:561
void index_close(Relation relation, LOCKMODE lockmode)
Definition: indexam.c:158
void * palloc(Size size)
Definition: mcxt.c:1062
int errmsg(const char *fmt,...)
Definition: elog.c:909
SysScanDesc systable_beginscan_ordered(Relation heapRelation, Relation indexRelation, Snapshot snapshot, int nkeys, ScanKey key)
Definition: genam.c:642
static int enum_cmp_internal(Oid arg1, Oid arg2, FunctionCallInfo fcinfo)
Definition: enum.c:246
#define NameStr(name)
Definition: c.h:681
void ScanKeyInit(ScanKey entry, AttrNumber attributeNumber, StrategyNumber strategy, RegProcedure procedure, Datum argument)
Definition: scankey.c:76
#define PG_GETARG_CSTRING(n)
Definition: fmgr.h:277
#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
static void check_safe_enum_use(HeapTuple enumval_tup)
Definition: enum.c:63
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:39
#define PG_RETURN_OID(x)
Definition: fmgr.h:360
Relation index_open(Oid relationId, LOCKMODE lockmode)
Definition: indexam.c:132
#define BTEqualStrategyNumber
Definition: stratnum.h:31