1 /*-------------------------------------------------------------------------
2 *
3 * rowtypes.c
4 * I/O and comparison functions for generic composite types.
5 *
6 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
8 *
9 *
10 * IDENTIFICATION
11 * src/backend/utils/adt/rowtypes.c
12 *
13 *-------------------------------------------------------------------------
14 */
15 #include "postgres.h"
16
17 #include <ctype.h>
18
19 #include "access/htup_details.h"
20 #include "access/tuptoaster.h"
21 #include "catalog/pg_type.h"
22 #include "funcapi.h"
23 #include "libpq/pqformat.h"
24 #include "miscadmin.h"
25 #include "utils/builtins.h"
26 #include "utils/datum.h"
27 #include "utils/lsyscache.h"
28 #include "utils/typcache.h"
29
30
31 /*
32 * structure to cache metadata needed for record I/O
33 */
34 typedef struct ColumnIOData
35 {
36 Oid column_type;
37 Oid typiofunc;
38 Oid typioparam;
39 bool typisvarlena;
40 FmgrInfo proc;
41 } ColumnIOData;
42
43 typedef struct RecordIOData
44 {
45 Oid record_type;
46 int32 record_typmod;
47 int ncolumns;
48 ColumnIOData columns[FLEXIBLE_ARRAY_MEMBER];
49 } RecordIOData;
50
51 /*
52 * structure to cache metadata needed for record comparison
53 */
54 typedef struct ColumnCompareData
55 {
56 TypeCacheEntry *typentry; /* has everything we need, actually */
57 } ColumnCompareData;
58
59 typedef struct RecordCompareData
60 {
61 int ncolumns; /* allocated length of columns[] */
62 Oid record1_type;
63 int32 record1_typmod;
64 Oid record2_type;
65 int32 record2_typmod;
66 ColumnCompareData columns[FLEXIBLE_ARRAY_MEMBER];
67 } RecordCompareData;
68
69
70 /*
71 * record_in - input routine for any composite type.
72 */
73 Datum
record_in(PG_FUNCTION_ARGS)74 record_in(PG_FUNCTION_ARGS)
75 {
76 char *string = PG_GETARG_CSTRING(0);
77 Oid tupType = PG_GETARG_OID(1);
78 int32 tupTypmod = PG_GETARG_INT32(2);
79 HeapTupleHeader result;
80 TupleDesc tupdesc;
81 HeapTuple tuple;
82 RecordIOData *my_extra;
83 bool needComma = false;
84 int ncolumns;
85 int i;
86 char *ptr;
87 Datum *values;
88 bool *nulls;
89 StringInfoData buf;
90
91 check_stack_depth(); /* recurses for record-type columns */
92
93 /*
94 * Give a friendly error message if we did not get enough info to identify
95 * the target record type. (lookup_rowtype_tupdesc would fail anyway, but
96 * with a non-user-friendly message.) In ordinary SQL usage, we'll get -1
97 * for typmod, since composite types and RECORD have no type modifiers at
98 * the SQL level, and thus must fail for RECORD. However some callers can
99 * supply a valid typmod, and then we can do something useful for RECORD.
100 */
101 if (tupType == RECORDOID && tupTypmod < 0)
102 ereport(ERROR,
103 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
104 errmsg("input of anonymous composite types is not implemented")));
105
106 /*
107 * This comes from the composite type's pg_type.oid and stores system oids
108 * in user tables, specifically DatumTupleFields. This oid must be
109 * preserved by binary upgrades.
110 */
111 tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
112 ncolumns = tupdesc->natts;
113
114 /*
115 * We arrange to look up the needed I/O info just once per series of
116 * calls, assuming the record type doesn't change underneath us.
117 */
118 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
119 if (my_extra == NULL ||
120 my_extra->ncolumns != ncolumns)
121 {
122 fcinfo->flinfo->fn_extra =
123 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
124 offsetof(RecordIOData, columns) +
125 ncolumns * sizeof(ColumnIOData));
126 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
127 my_extra->record_type = InvalidOid;
128 my_extra->record_typmod = 0;
129 }
130
131 if (my_extra->record_type != tupType ||
132 my_extra->record_typmod != tupTypmod)
133 {
134 MemSet(my_extra, 0,
135 offsetof(RecordIOData, columns) +
136 ncolumns * sizeof(ColumnIOData));
137 my_extra->record_type = tupType;
138 my_extra->record_typmod = tupTypmod;
139 my_extra->ncolumns = ncolumns;
140 }
141
142 values = (Datum *) palloc(ncolumns * sizeof(Datum));
143 nulls = (bool *) palloc(ncolumns * sizeof(bool));
144
145 /*
146 * Scan the string. We use "buf" to accumulate the de-quoted data for
147 * each column, which is then fed to the appropriate input converter.
148 */
149 ptr = string;
150 /* Allow leading whitespace */
151 while (*ptr && isspace((unsigned char) *ptr))
152 ptr++;
153 if (*ptr++ != '(')
154 ereport(ERROR,
155 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
156 errmsg("malformed record literal: \"%s\"", string),
157 errdetail("Missing left parenthesis.")));
158
159 initStringInfo(&buf);
160
161 for (i = 0; i < ncolumns; i++)
162 {
163 Form_pg_attribute att = TupleDescAttr(tupdesc, i);
164 ColumnIOData *column_info = &my_extra->columns[i];
165 Oid column_type = att->atttypid;
166 char *column_data;
167
168 /* Ignore dropped columns in datatype, but fill with nulls */
169 if (att->attisdropped)
170 {
171 values[i] = (Datum) 0;
172 nulls[i] = true;
173 continue;
174 }
175
176 if (needComma)
177 {
178 /* Skip comma that separates prior field from this one */
179 if (*ptr == ',')
180 ptr++;
181 else
182 /* *ptr must be ')' */
183 ereport(ERROR,
184 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
185 errmsg("malformed record literal: \"%s\"", string),
186 errdetail("Too few columns.")));
187 }
188
189 /* Check for null: completely empty input means null */
190 if (*ptr == ',' || *ptr == ')')
191 {
192 column_data = NULL;
193 nulls[i] = true;
194 }
195 else
196 {
197 /* Extract string for this column */
198 bool inquote = false;
199
200 resetStringInfo(&buf);
201 while (inquote || !(*ptr == ',' || *ptr == ')'))
202 {
203 char ch = *ptr++;
204
205 if (ch == '\0')
206 ereport(ERROR,
207 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
208 errmsg("malformed record literal: \"%s\"",
209 string),
210 errdetail("Unexpected end of input.")));
211 if (ch == '\\')
212 {
213 if (*ptr == '\0')
214 ereport(ERROR,
215 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
216 errmsg("malformed record literal: \"%s\"",
217 string),
218 errdetail("Unexpected end of input.")));
219 appendStringInfoChar(&buf, *ptr++);
220 }
221 else if (ch == '"')
222 {
223 if (!inquote)
224 inquote = true;
225 else if (*ptr == '"')
226 {
227 /* doubled quote within quote sequence */
228 appendStringInfoChar(&buf, *ptr++);
229 }
230 else
231 inquote = false;
232 }
233 else
234 appendStringInfoChar(&buf, ch);
235 }
236
237 column_data = buf.data;
238 nulls[i] = false;
239 }
240
241 /*
242 * Convert the column value
243 */
244 if (column_info->column_type != column_type)
245 {
246 getTypeInputInfo(column_type,
247 &column_info->typiofunc,
248 &column_info->typioparam);
249 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
250 fcinfo->flinfo->fn_mcxt);
251 column_info->column_type = column_type;
252 }
253
254 values[i] = InputFunctionCall(&column_info->proc,
255 column_data,
256 column_info->typioparam,
257 att->atttypmod);
258
259 /*
260 * Prep for next column
261 */
262 needComma = true;
263 }
264
265 if (*ptr++ != ')')
266 ereport(ERROR,
267 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
268 errmsg("malformed record literal: \"%s\"", string),
269 errdetail("Too many columns.")));
270 /* Allow trailing whitespace */
271 while (*ptr && isspace((unsigned char) *ptr))
272 ptr++;
273 if (*ptr)
274 ereport(ERROR,
275 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
276 errmsg("malformed record literal: \"%s\"", string),
277 errdetail("Junk after right parenthesis.")));
278
279 tuple = heap_form_tuple(tupdesc, values, nulls);
280
281 /*
282 * We cannot return tuple->t_data because heap_form_tuple allocates it as
283 * part of a larger chunk, and our caller may expect to be able to pfree
284 * our result. So must copy the info into a new palloc chunk.
285 */
286 result = (HeapTupleHeader) palloc(tuple->t_len);
287 memcpy(result, tuple->t_data, tuple->t_len);
288
289 heap_freetuple(tuple);
290 pfree(buf.data);
291 pfree(values);
292 pfree(nulls);
293 ReleaseTupleDesc(tupdesc);
294
295 PG_RETURN_HEAPTUPLEHEADER(result);
296 }
297
298 /*
299 * record_out - output routine for any composite type.
300 */
301 Datum
record_out(PG_FUNCTION_ARGS)302 record_out(PG_FUNCTION_ARGS)
303 {
304 HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
305 Oid tupType;
306 int32 tupTypmod;
307 TupleDesc tupdesc;
308 HeapTupleData tuple;
309 RecordIOData *my_extra;
310 bool needComma = false;
311 int ncolumns;
312 int i;
313 Datum *values;
314 bool *nulls;
315 StringInfoData buf;
316
317 check_stack_depth(); /* recurses for record-type columns */
318
319 /* Extract type info from the tuple itself */
320 tupType = HeapTupleHeaderGetTypeId(rec);
321 tupTypmod = HeapTupleHeaderGetTypMod(rec);
322 tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
323 ncolumns = tupdesc->natts;
324
325 /* Build a temporary HeapTuple control structure */
326 tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
327 ItemPointerSetInvalid(&(tuple.t_self));
328 tuple.t_tableOid = InvalidOid;
329 tuple.t_data = rec;
330
331 /*
332 * We arrange to look up the needed I/O info just once per series of
333 * calls, assuming the record type doesn't change underneath us.
334 */
335 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
336 if (my_extra == NULL ||
337 my_extra->ncolumns != ncolumns)
338 {
339 fcinfo->flinfo->fn_extra =
340 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
341 offsetof(RecordIOData, columns) +
342 ncolumns * sizeof(ColumnIOData));
343 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
344 my_extra->record_type = InvalidOid;
345 my_extra->record_typmod = 0;
346 }
347
348 if (my_extra->record_type != tupType ||
349 my_extra->record_typmod != tupTypmod)
350 {
351 MemSet(my_extra, 0,
352 offsetof(RecordIOData, columns) +
353 ncolumns * sizeof(ColumnIOData));
354 my_extra->record_type = tupType;
355 my_extra->record_typmod = tupTypmod;
356 my_extra->ncolumns = ncolumns;
357 }
358
359 values = (Datum *) palloc(ncolumns * sizeof(Datum));
360 nulls = (bool *) palloc(ncolumns * sizeof(bool));
361
362 /* Break down the tuple into fields */
363 heap_deform_tuple(&tuple, tupdesc, values, nulls);
364
365 /* And build the result string */
366 initStringInfo(&buf);
367
368 appendStringInfoChar(&buf, '(');
369
370 for (i = 0; i < ncolumns; i++)
371 {
372 Form_pg_attribute att = TupleDescAttr(tupdesc, i);
373 ColumnIOData *column_info = &my_extra->columns[i];
374 Oid column_type = att->atttypid;
375 Datum attr;
376 char *value;
377 char *tmp;
378 bool nq;
379
380 /* Ignore dropped columns in datatype */
381 if (att->attisdropped)
382 continue;
383
384 if (needComma)
385 appendStringInfoChar(&buf, ',');
386 needComma = true;
387
388 if (nulls[i])
389 {
390 /* emit nothing... */
391 continue;
392 }
393
394 /*
395 * Convert the column value to text
396 */
397 if (column_info->column_type != column_type)
398 {
399 getTypeOutputInfo(column_type,
400 &column_info->typiofunc,
401 &column_info->typisvarlena);
402 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
403 fcinfo->flinfo->fn_mcxt);
404 column_info->column_type = column_type;
405 }
406
407 attr = values[i];
408 value = OutputFunctionCall(&column_info->proc, attr);
409
410 /* Detect whether we need double quotes for this value */
411 nq = (value[0] == '\0'); /* force quotes for empty string */
412 for (tmp = value; *tmp; tmp++)
413 {
414 char ch = *tmp;
415
416 if (ch == '"' || ch == '\\' ||
417 ch == '(' || ch == ')' || ch == ',' ||
418 isspace((unsigned char) ch))
419 {
420 nq = true;
421 break;
422 }
423 }
424
425 /* And emit the string */
426 if (nq)
427 appendStringInfoCharMacro(&buf, '"');
428 for (tmp = value; *tmp; tmp++)
429 {
430 char ch = *tmp;
431
432 if (ch == '"' || ch == '\\')
433 appendStringInfoCharMacro(&buf, ch);
434 appendStringInfoCharMacro(&buf, ch);
435 }
436 if (nq)
437 appendStringInfoCharMacro(&buf, '"');
438 }
439
440 appendStringInfoChar(&buf, ')');
441
442 pfree(values);
443 pfree(nulls);
444 ReleaseTupleDesc(tupdesc);
445
446 PG_RETURN_CSTRING(buf.data);
447 }
448
449 /*
450 * record_recv - binary input routine for any composite type.
451 */
452 Datum
record_recv(PG_FUNCTION_ARGS)453 record_recv(PG_FUNCTION_ARGS)
454 {
455 StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
456 Oid tupType = PG_GETARG_OID(1);
457 int32 tupTypmod = PG_GETARG_INT32(2);
458 HeapTupleHeader result;
459 TupleDesc tupdesc;
460 HeapTuple tuple;
461 RecordIOData *my_extra;
462 int ncolumns;
463 int usercols;
464 int validcols;
465 int i;
466 Datum *values;
467 bool *nulls;
468
469 check_stack_depth(); /* recurses for record-type columns */
470
471 /*
472 * Give a friendly error message if we did not get enough info to identify
473 * the target record type. (lookup_rowtype_tupdesc would fail anyway, but
474 * with a non-user-friendly message.) In ordinary SQL usage, we'll get -1
475 * for typmod, since composite types and RECORD have no type modifiers at
476 * the SQL level, and thus must fail for RECORD. However some callers can
477 * supply a valid typmod, and then we can do something useful for RECORD.
478 */
479 if (tupType == RECORDOID && tupTypmod < 0)
480 ereport(ERROR,
481 (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
482 errmsg("input of anonymous composite types is not implemented")));
483
484 tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
485 ncolumns = tupdesc->natts;
486
487 /*
488 * We arrange to look up the needed I/O info just once per series of
489 * calls, assuming the record type doesn't change underneath us.
490 */
491 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
492 if (my_extra == NULL ||
493 my_extra->ncolumns != ncolumns)
494 {
495 fcinfo->flinfo->fn_extra =
496 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
497 offsetof(RecordIOData, columns) +
498 ncolumns * sizeof(ColumnIOData));
499 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
500 my_extra->record_type = InvalidOid;
501 my_extra->record_typmod = 0;
502 }
503
504 if (my_extra->record_type != tupType ||
505 my_extra->record_typmod != tupTypmod)
506 {
507 MemSet(my_extra, 0,
508 offsetof(RecordIOData, columns) +
509 ncolumns * sizeof(ColumnIOData));
510 my_extra->record_type = tupType;
511 my_extra->record_typmod = tupTypmod;
512 my_extra->ncolumns = ncolumns;
513 }
514
515 values = (Datum *) palloc(ncolumns * sizeof(Datum));
516 nulls = (bool *) palloc(ncolumns * sizeof(bool));
517
518 /* Fetch number of columns user thinks it has */
519 usercols = pq_getmsgint(buf, 4);
520
521 /* Need to scan to count nondeleted columns */
522 validcols = 0;
523 for (i = 0; i < ncolumns; i++)
524 {
525 if (!TupleDescAttr(tupdesc, i)->attisdropped)
526 validcols++;
527 }
528 if (usercols != validcols)
529 ereport(ERROR,
530 (errcode(ERRCODE_DATATYPE_MISMATCH),
531 errmsg("wrong number of columns: %d, expected %d",
532 usercols, validcols)));
533
534 /* Process each column */
535 for (i = 0; i < ncolumns; i++)
536 {
537 Form_pg_attribute att = TupleDescAttr(tupdesc, i);
538 ColumnIOData *column_info = &my_extra->columns[i];
539 Oid column_type = att->atttypid;
540 Oid coltypoid;
541 int itemlen;
542 StringInfoData item_buf;
543 StringInfo bufptr;
544 char csave;
545
546 /* Ignore dropped columns in datatype, but fill with nulls */
547 if (att->attisdropped)
548 {
549 values[i] = (Datum) 0;
550 nulls[i] = true;
551 continue;
552 }
553
554 /* Verify column datatype */
555 coltypoid = pq_getmsgint(buf, sizeof(Oid));
556 if (coltypoid != column_type)
557 ereport(ERROR,
558 (errcode(ERRCODE_DATATYPE_MISMATCH),
559 errmsg("wrong data type: %u, expected %u",
560 coltypoid, column_type)));
561
562 /* Get and check the item length */
563 itemlen = pq_getmsgint(buf, 4);
564 if (itemlen < -1 || itemlen > (buf->len - buf->cursor))
565 ereport(ERROR,
566 (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
567 errmsg("insufficient data left in message")));
568
569 if (itemlen == -1)
570 {
571 /* -1 length means NULL */
572 bufptr = NULL;
573 nulls[i] = true;
574 csave = 0; /* keep compiler quiet */
575 }
576 else
577 {
578 /*
579 * Rather than copying data around, we just set up a phony
580 * StringInfo pointing to the correct portion of the input buffer.
581 * We assume we can scribble on the input buffer so as to maintain
582 * the convention that StringInfos have a trailing null.
583 */
584 item_buf.data = &buf->data[buf->cursor];
585 item_buf.maxlen = itemlen + 1;
586 item_buf.len = itemlen;
587 item_buf.cursor = 0;
588
589 buf->cursor += itemlen;
590
591 csave = buf->data[buf->cursor];
592 buf->data[buf->cursor] = '\0';
593
594 bufptr = &item_buf;
595 nulls[i] = false;
596 }
597
598 /* Now call the column's receiveproc */
599 if (column_info->column_type != column_type)
600 {
601 getTypeBinaryInputInfo(column_type,
602 &column_info->typiofunc,
603 &column_info->typioparam);
604 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
605 fcinfo->flinfo->fn_mcxt);
606 column_info->column_type = column_type;
607 }
608
609 values[i] = ReceiveFunctionCall(&column_info->proc,
610 bufptr,
611 column_info->typioparam,
612 att->atttypmod);
613
614 if (bufptr)
615 {
616 /* Trouble if it didn't eat the whole buffer */
617 if (item_buf.cursor != itemlen)
618 ereport(ERROR,
619 (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
620 errmsg("improper binary format in record column %d",
621 i + 1)));
622
623 buf->data[buf->cursor] = csave;
624 }
625 }
626
627 tuple = heap_form_tuple(tupdesc, values, nulls);
628
629 /*
630 * We cannot return tuple->t_data because heap_form_tuple allocates it as
631 * part of a larger chunk, and our caller may expect to be able to pfree
632 * our result. So must copy the info into a new palloc chunk.
633 */
634 result = (HeapTupleHeader) palloc(tuple->t_len);
635 memcpy(result, tuple->t_data, tuple->t_len);
636
637 heap_freetuple(tuple);
638 pfree(values);
639 pfree(nulls);
640 ReleaseTupleDesc(tupdesc);
641
642 PG_RETURN_HEAPTUPLEHEADER(result);
643 }
644
645 /*
646 * record_send - binary output routine for any composite type.
647 */
648 Datum
record_send(PG_FUNCTION_ARGS)649 record_send(PG_FUNCTION_ARGS)
650 {
651 HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
652 Oid tupType;
653 int32 tupTypmod;
654 TupleDesc tupdesc;
655 HeapTupleData tuple;
656 RecordIOData *my_extra;
657 int ncolumns;
658 int validcols;
659 int i;
660 Datum *values;
661 bool *nulls;
662 StringInfoData buf;
663
664 check_stack_depth(); /* recurses for record-type columns */
665
666 /* Extract type info from the tuple itself */
667 tupType = HeapTupleHeaderGetTypeId(rec);
668 tupTypmod = HeapTupleHeaderGetTypMod(rec);
669 tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
670 ncolumns = tupdesc->natts;
671
672 /* Build a temporary HeapTuple control structure */
673 tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
674 ItemPointerSetInvalid(&(tuple.t_self));
675 tuple.t_tableOid = InvalidOid;
676 tuple.t_data = rec;
677
678 /*
679 * We arrange to look up the needed I/O info just once per series of
680 * calls, assuming the record type doesn't change underneath us.
681 */
682 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
683 if (my_extra == NULL ||
684 my_extra->ncolumns != ncolumns)
685 {
686 fcinfo->flinfo->fn_extra =
687 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
688 offsetof(RecordIOData, columns) +
689 ncolumns * sizeof(ColumnIOData));
690 my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
691 my_extra->record_type = InvalidOid;
692 my_extra->record_typmod = 0;
693 }
694
695 if (my_extra->record_type != tupType ||
696 my_extra->record_typmod != tupTypmod)
697 {
698 MemSet(my_extra, 0,
699 offsetof(RecordIOData, columns) +
700 ncolumns * sizeof(ColumnIOData));
701 my_extra->record_type = tupType;
702 my_extra->record_typmod = tupTypmod;
703 my_extra->ncolumns = ncolumns;
704 }
705
706 values = (Datum *) palloc(ncolumns * sizeof(Datum));
707 nulls = (bool *) palloc(ncolumns * sizeof(bool));
708
709 /* Break down the tuple into fields */
710 heap_deform_tuple(&tuple, tupdesc, values, nulls);
711
712 /* And build the result string */
713 pq_begintypsend(&buf);
714
715 /* Need to scan to count nondeleted columns */
716 validcols = 0;
717 for (i = 0; i < ncolumns; i++)
718 {
719 if (!TupleDescAttr(tupdesc, i)->attisdropped)
720 validcols++;
721 }
722 pq_sendint32(&buf, validcols);
723
724 for (i = 0; i < ncolumns; i++)
725 {
726 Form_pg_attribute att = TupleDescAttr(tupdesc, i);
727 ColumnIOData *column_info = &my_extra->columns[i];
728 Oid column_type = att->atttypid;
729 Datum attr;
730 bytea *outputbytes;
731
732 /* Ignore dropped columns in datatype */
733 if (att->attisdropped)
734 continue;
735
736 pq_sendint32(&buf, column_type);
737
738 if (nulls[i])
739 {
740 /* emit -1 data length to signify a NULL */
741 pq_sendint32(&buf, -1);
742 continue;
743 }
744
745 /*
746 * Convert the column value to binary
747 */
748 if (column_info->column_type != column_type)
749 {
750 getTypeBinaryOutputInfo(column_type,
751 &column_info->typiofunc,
752 &column_info->typisvarlena);
753 fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
754 fcinfo->flinfo->fn_mcxt);
755 column_info->column_type = column_type;
756 }
757
758 attr = values[i];
759 outputbytes = SendFunctionCall(&column_info->proc, attr);
760 pq_sendint32(&buf, VARSIZE(outputbytes) - VARHDRSZ);
761 pq_sendbytes(&buf, VARDATA(outputbytes),
762 VARSIZE(outputbytes) - VARHDRSZ);
763 }
764
765 pfree(values);
766 pfree(nulls);
767 ReleaseTupleDesc(tupdesc);
768
769 PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
770 }
771
772
773 /*
774 * record_cmp()
775 * Internal comparison function for records.
776 *
777 * Returns -1, 0 or 1
778 *
779 * Do not assume that the two inputs are exactly the same record type;
780 * for instance we might be comparing an anonymous ROW() construct against a
781 * named composite type. We will compare as long as they have the same number
782 * of non-dropped columns of the same types.
783 */
784 static int
record_cmp(FunctionCallInfo fcinfo)785 record_cmp(FunctionCallInfo fcinfo)
786 {
787 HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
788 HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
789 int result = 0;
790 Oid tupType1;
791 Oid tupType2;
792 int32 tupTypmod1;
793 int32 tupTypmod2;
794 TupleDesc tupdesc1;
795 TupleDesc tupdesc2;
796 HeapTupleData tuple1;
797 HeapTupleData tuple2;
798 int ncolumns1;
799 int ncolumns2;
800 RecordCompareData *my_extra;
801 int ncols;
802 Datum *values1;
803 Datum *values2;
804 bool *nulls1;
805 bool *nulls2;
806 int i1;
807 int i2;
808 int j;
809
810 check_stack_depth(); /* recurses for record-type columns */
811
812 /* Extract type info from the tuples */
813 tupType1 = HeapTupleHeaderGetTypeId(record1);
814 tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
815 tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
816 ncolumns1 = tupdesc1->natts;
817 tupType2 = HeapTupleHeaderGetTypeId(record2);
818 tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
819 tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
820 ncolumns2 = tupdesc2->natts;
821
822 /* Build temporary HeapTuple control structures */
823 tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
824 ItemPointerSetInvalid(&(tuple1.t_self));
825 tuple1.t_tableOid = InvalidOid;
826 tuple1.t_data = record1;
827 tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
828 ItemPointerSetInvalid(&(tuple2.t_self));
829 tuple2.t_tableOid = InvalidOid;
830 tuple2.t_data = record2;
831
832 /*
833 * We arrange to look up the needed comparison info just once per series
834 * of calls, assuming the record types don't change underneath us.
835 */
836 ncols = Max(ncolumns1, ncolumns2);
837 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
838 if (my_extra == NULL ||
839 my_extra->ncolumns < ncols)
840 {
841 fcinfo->flinfo->fn_extra =
842 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
843 offsetof(RecordCompareData, columns) +
844 ncols * sizeof(ColumnCompareData));
845 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
846 my_extra->ncolumns = ncols;
847 my_extra->record1_type = InvalidOid;
848 my_extra->record1_typmod = 0;
849 my_extra->record2_type = InvalidOid;
850 my_extra->record2_typmod = 0;
851 }
852
853 if (my_extra->record1_type != tupType1 ||
854 my_extra->record1_typmod != tupTypmod1 ||
855 my_extra->record2_type != tupType2 ||
856 my_extra->record2_typmod != tupTypmod2)
857 {
858 MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
859 my_extra->record1_type = tupType1;
860 my_extra->record1_typmod = tupTypmod1;
861 my_extra->record2_type = tupType2;
862 my_extra->record2_typmod = tupTypmod2;
863 }
864
865 /* Break down the tuples into fields */
866 values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
867 nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
868 heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
869 values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
870 nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
871 heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
872
873 /*
874 * Scan corresponding columns, allowing for dropped columns in different
875 * places in the two rows. i1 and i2 are physical column indexes, j is
876 * the logical column index.
877 */
878 i1 = i2 = j = 0;
879 while (i1 < ncolumns1 || i2 < ncolumns2)
880 {
881 Form_pg_attribute att1;
882 Form_pg_attribute att2;
883 TypeCacheEntry *typentry;
884 Oid collation;
885
886 /*
887 * Skip dropped columns
888 */
889 if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
890 {
891 i1++;
892 continue;
893 }
894 if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
895 {
896 i2++;
897 continue;
898 }
899 if (i1 >= ncolumns1 || i2 >= ncolumns2)
900 break; /* we'll deal with mismatch below loop */
901
902 att1 = TupleDescAttr(tupdesc1, i1);
903 att2 = TupleDescAttr(tupdesc2, i2);
904
905 /*
906 * Have two matching columns, they must be same type
907 */
908 if (att1->atttypid != att2->atttypid)
909 ereport(ERROR,
910 (errcode(ERRCODE_DATATYPE_MISMATCH),
911 errmsg("cannot compare dissimilar column types %s and %s at record column %d",
912 format_type_be(att1->atttypid),
913 format_type_be(att2->atttypid),
914 j + 1)));
915
916 /*
917 * If they're not same collation, we don't complain here, but the
918 * comparison function might.
919 */
920 collation = att1->attcollation;
921 if (collation != att2->attcollation)
922 collation = InvalidOid;
923
924 /*
925 * Lookup the comparison function if not done already
926 */
927 typentry = my_extra->columns[j].typentry;
928 if (typentry == NULL ||
929 typentry->type_id != att1->atttypid)
930 {
931 typentry = lookup_type_cache(att1->atttypid,
932 TYPECACHE_CMP_PROC_FINFO);
933 if (!OidIsValid(typentry->cmp_proc_finfo.fn_oid))
934 ereport(ERROR,
935 (errcode(ERRCODE_UNDEFINED_FUNCTION),
936 errmsg("could not identify a comparison function for type %s",
937 format_type_be(typentry->type_id))));
938 my_extra->columns[j].typentry = typentry;
939 }
940
941 /*
942 * We consider two NULLs equal; NULL > not-NULL.
943 */
944 if (!nulls1[i1] || !nulls2[i2])
945 {
946 LOCAL_FCINFO(locfcinfo, 2);
947 int32 cmpresult;
948
949 if (nulls1[i1])
950 {
951 /* arg1 is greater than arg2 */
952 result = 1;
953 break;
954 }
955 if (nulls2[i2])
956 {
957 /* arg1 is less than arg2 */
958 result = -1;
959 break;
960 }
961
962 /* Compare the pair of elements */
963 InitFunctionCallInfoData(*locfcinfo, &typentry->cmp_proc_finfo, 2,
964 collation, NULL, NULL);
965 locfcinfo->args[0].value = values1[i1];
966 locfcinfo->args[0].isnull = false;
967 locfcinfo->args[1].value = values2[i2];
968 locfcinfo->args[1].isnull = false;
969 locfcinfo->isnull = false;
970 cmpresult = DatumGetInt32(FunctionCallInvoke(locfcinfo));
971
972 if (cmpresult < 0)
973 {
974 /* arg1 is less than arg2 */
975 result = -1;
976 break;
977 }
978 else if (cmpresult > 0)
979 {
980 /* arg1 is greater than arg2 */
981 result = 1;
982 break;
983 }
984 }
985
986 /* equal, so continue to next column */
987 i1++, i2++, j++;
988 }
989
990 /*
991 * If we didn't break out of the loop early, check for column count
992 * mismatch. (We do not report such mismatch if we found unequal column
993 * values; is that a feature or a bug?)
994 */
995 if (result == 0)
996 {
997 if (i1 != ncolumns1 || i2 != ncolumns2)
998 ereport(ERROR,
999 (errcode(ERRCODE_DATATYPE_MISMATCH),
1000 errmsg("cannot compare record types with different numbers of columns")));
1001 }
1002
1003 pfree(values1);
1004 pfree(nulls1);
1005 pfree(values2);
1006 pfree(nulls2);
1007 ReleaseTupleDesc(tupdesc1);
1008 ReleaseTupleDesc(tupdesc2);
1009
1010 /* Avoid leaking memory when handed toasted input. */
1011 PG_FREE_IF_COPY(record1, 0);
1012 PG_FREE_IF_COPY(record2, 1);
1013
1014 return result;
1015 }
1016
1017 /*
1018 * record_eq :
1019 * compares two records for equality
1020 * result :
1021 * returns true if the records are equal, false otherwise.
1022 *
1023 * Note: we do not use record_cmp here, since equality may be meaningful in
1024 * datatypes that don't have a total ordering (and hence no btree support).
1025 */
1026 Datum
record_eq(PG_FUNCTION_ARGS)1027 record_eq(PG_FUNCTION_ARGS)
1028 {
1029 HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
1030 HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
1031 bool result = true;
1032 Oid tupType1;
1033 Oid tupType2;
1034 int32 tupTypmod1;
1035 int32 tupTypmod2;
1036 TupleDesc tupdesc1;
1037 TupleDesc tupdesc2;
1038 HeapTupleData tuple1;
1039 HeapTupleData tuple2;
1040 int ncolumns1;
1041 int ncolumns2;
1042 RecordCompareData *my_extra;
1043 int ncols;
1044 Datum *values1;
1045 Datum *values2;
1046 bool *nulls1;
1047 bool *nulls2;
1048 int i1;
1049 int i2;
1050 int j;
1051
1052 check_stack_depth(); /* recurses for record-type columns */
1053
1054 /* Extract type info from the tuples */
1055 tupType1 = HeapTupleHeaderGetTypeId(record1);
1056 tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
1057 tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
1058 ncolumns1 = tupdesc1->natts;
1059 tupType2 = HeapTupleHeaderGetTypeId(record2);
1060 tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
1061 tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
1062 ncolumns2 = tupdesc2->natts;
1063
1064 /* Build temporary HeapTuple control structures */
1065 tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
1066 ItemPointerSetInvalid(&(tuple1.t_self));
1067 tuple1.t_tableOid = InvalidOid;
1068 tuple1.t_data = record1;
1069 tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
1070 ItemPointerSetInvalid(&(tuple2.t_self));
1071 tuple2.t_tableOid = InvalidOid;
1072 tuple2.t_data = record2;
1073
1074 /*
1075 * We arrange to look up the needed comparison info just once per series
1076 * of calls, assuming the record types don't change underneath us.
1077 */
1078 ncols = Max(ncolumns1, ncolumns2);
1079 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1080 if (my_extra == NULL ||
1081 my_extra->ncolumns < ncols)
1082 {
1083 fcinfo->flinfo->fn_extra =
1084 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
1085 offsetof(RecordCompareData, columns) +
1086 ncols * sizeof(ColumnCompareData));
1087 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1088 my_extra->ncolumns = ncols;
1089 my_extra->record1_type = InvalidOid;
1090 my_extra->record1_typmod = 0;
1091 my_extra->record2_type = InvalidOid;
1092 my_extra->record2_typmod = 0;
1093 }
1094
1095 if (my_extra->record1_type != tupType1 ||
1096 my_extra->record1_typmod != tupTypmod1 ||
1097 my_extra->record2_type != tupType2 ||
1098 my_extra->record2_typmod != tupTypmod2)
1099 {
1100 MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
1101 my_extra->record1_type = tupType1;
1102 my_extra->record1_typmod = tupTypmod1;
1103 my_extra->record2_type = tupType2;
1104 my_extra->record2_typmod = tupTypmod2;
1105 }
1106
1107 /* Break down the tuples into fields */
1108 values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
1109 nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
1110 heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
1111 values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
1112 nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
1113 heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
1114
1115 /*
1116 * Scan corresponding columns, allowing for dropped columns in different
1117 * places in the two rows. i1 and i2 are physical column indexes, j is
1118 * the logical column index.
1119 */
1120 i1 = i2 = j = 0;
1121 while (i1 < ncolumns1 || i2 < ncolumns2)
1122 {
1123 LOCAL_FCINFO(locfcinfo, 2);
1124 Form_pg_attribute att1;
1125 Form_pg_attribute att2;
1126 TypeCacheEntry *typentry;
1127 Oid collation;
1128 bool oprresult;
1129
1130 /*
1131 * Skip dropped columns
1132 */
1133 if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
1134 {
1135 i1++;
1136 continue;
1137 }
1138 if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
1139 {
1140 i2++;
1141 continue;
1142 }
1143 if (i1 >= ncolumns1 || i2 >= ncolumns2)
1144 break; /* we'll deal with mismatch below loop */
1145
1146 att1 = TupleDescAttr(tupdesc1, i1);
1147 att2 = TupleDescAttr(tupdesc2, i2);
1148
1149 /*
1150 * Have two matching columns, they must be same type
1151 */
1152 if (att1->atttypid != att2->atttypid)
1153 ereport(ERROR,
1154 (errcode(ERRCODE_DATATYPE_MISMATCH),
1155 errmsg("cannot compare dissimilar column types %s and %s at record column %d",
1156 format_type_be(att1->atttypid),
1157 format_type_be(att2->atttypid),
1158 j + 1)));
1159
1160 /*
1161 * If they're not same collation, we don't complain here, but the
1162 * equality function might.
1163 */
1164 collation = att1->attcollation;
1165 if (collation != att2->attcollation)
1166 collation = InvalidOid;
1167
1168 /*
1169 * Lookup the equality function if not done already
1170 */
1171 typentry = my_extra->columns[j].typentry;
1172 if (typentry == NULL ||
1173 typentry->type_id != att1->atttypid)
1174 {
1175 typentry = lookup_type_cache(att1->atttypid,
1176 TYPECACHE_EQ_OPR_FINFO);
1177 if (!OidIsValid(typentry->eq_opr_finfo.fn_oid))
1178 ereport(ERROR,
1179 (errcode(ERRCODE_UNDEFINED_FUNCTION),
1180 errmsg("could not identify an equality operator for type %s",
1181 format_type_be(typentry->type_id))));
1182 my_extra->columns[j].typentry = typentry;
1183 }
1184
1185 /*
1186 * We consider two NULLs equal; NULL > not-NULL.
1187 */
1188 if (!nulls1[i1] || !nulls2[i2])
1189 {
1190 if (nulls1[i1] || nulls2[i2])
1191 {
1192 result = false;
1193 break;
1194 }
1195
1196 /* Compare the pair of elements */
1197 InitFunctionCallInfoData(*locfcinfo, &typentry->eq_opr_finfo, 2,
1198 collation, NULL, NULL);
1199 locfcinfo->args[0].value = values1[i1];
1200 locfcinfo->args[0].isnull = false;
1201 locfcinfo->args[1].value = values2[i2];
1202 locfcinfo->args[1].isnull = false;
1203 locfcinfo->isnull = false;
1204 oprresult = DatumGetBool(FunctionCallInvoke(locfcinfo));
1205 if (!oprresult)
1206 {
1207 result = false;
1208 break;
1209 }
1210 }
1211
1212 /* equal, so continue to next column */
1213 i1++, i2++, j++;
1214 }
1215
1216 /*
1217 * If we didn't break out of the loop early, check for column count
1218 * mismatch. (We do not report such mismatch if we found unequal column
1219 * values; is that a feature or a bug?)
1220 */
1221 if (result)
1222 {
1223 if (i1 != ncolumns1 || i2 != ncolumns2)
1224 ereport(ERROR,
1225 (errcode(ERRCODE_DATATYPE_MISMATCH),
1226 errmsg("cannot compare record types with different numbers of columns")));
1227 }
1228
1229 pfree(values1);
1230 pfree(nulls1);
1231 pfree(values2);
1232 pfree(nulls2);
1233 ReleaseTupleDesc(tupdesc1);
1234 ReleaseTupleDesc(tupdesc2);
1235
1236 /* Avoid leaking memory when handed toasted input. */
1237 PG_FREE_IF_COPY(record1, 0);
1238 PG_FREE_IF_COPY(record2, 1);
1239
1240 PG_RETURN_BOOL(result);
1241 }
1242
1243 Datum
record_ne(PG_FUNCTION_ARGS)1244 record_ne(PG_FUNCTION_ARGS)
1245 {
1246 PG_RETURN_BOOL(!DatumGetBool(record_eq(fcinfo)));
1247 }
1248
1249 Datum
record_lt(PG_FUNCTION_ARGS)1250 record_lt(PG_FUNCTION_ARGS)
1251 {
1252 PG_RETURN_BOOL(record_cmp(fcinfo) < 0);
1253 }
1254
1255 Datum
record_gt(PG_FUNCTION_ARGS)1256 record_gt(PG_FUNCTION_ARGS)
1257 {
1258 PG_RETURN_BOOL(record_cmp(fcinfo) > 0);
1259 }
1260
1261 Datum
record_le(PG_FUNCTION_ARGS)1262 record_le(PG_FUNCTION_ARGS)
1263 {
1264 PG_RETURN_BOOL(record_cmp(fcinfo) <= 0);
1265 }
1266
1267 Datum
record_ge(PG_FUNCTION_ARGS)1268 record_ge(PG_FUNCTION_ARGS)
1269 {
1270 PG_RETURN_BOOL(record_cmp(fcinfo) >= 0);
1271 }
1272
1273 Datum
btrecordcmp(PG_FUNCTION_ARGS)1274 btrecordcmp(PG_FUNCTION_ARGS)
1275 {
1276 PG_RETURN_INT32(record_cmp(fcinfo));
1277 }
1278
1279
1280 /*
1281 * record_image_cmp :
1282 * Internal byte-oriented comparison function for records.
1283 *
1284 * Returns -1, 0 or 1
1285 *
1286 * Note: The normal concepts of "equality" do not apply here; different
1287 * representation of values considered to be equal are not considered to be
1288 * identical. As an example, for the citext type 'A' and 'a' are equal, but
1289 * they are not identical.
1290 */
1291 static int
record_image_cmp(FunctionCallInfo fcinfo)1292 record_image_cmp(FunctionCallInfo fcinfo)
1293 {
1294 HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
1295 HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
1296 int result = 0;
1297 Oid tupType1;
1298 Oid tupType2;
1299 int32 tupTypmod1;
1300 int32 tupTypmod2;
1301 TupleDesc tupdesc1;
1302 TupleDesc tupdesc2;
1303 HeapTupleData tuple1;
1304 HeapTupleData tuple2;
1305 int ncolumns1;
1306 int ncolumns2;
1307 RecordCompareData *my_extra;
1308 int ncols;
1309 Datum *values1;
1310 Datum *values2;
1311 bool *nulls1;
1312 bool *nulls2;
1313 int i1;
1314 int i2;
1315 int j;
1316
1317 /* Extract type info from the tuples */
1318 tupType1 = HeapTupleHeaderGetTypeId(record1);
1319 tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
1320 tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
1321 ncolumns1 = tupdesc1->natts;
1322 tupType2 = HeapTupleHeaderGetTypeId(record2);
1323 tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
1324 tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
1325 ncolumns2 = tupdesc2->natts;
1326
1327 /* Build temporary HeapTuple control structures */
1328 tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
1329 ItemPointerSetInvalid(&(tuple1.t_self));
1330 tuple1.t_tableOid = InvalidOid;
1331 tuple1.t_data = record1;
1332 tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
1333 ItemPointerSetInvalid(&(tuple2.t_self));
1334 tuple2.t_tableOid = InvalidOid;
1335 tuple2.t_data = record2;
1336
1337 /*
1338 * We arrange to look up the needed comparison info just once per series
1339 * of calls, assuming the record types don't change underneath us.
1340 */
1341 ncols = Max(ncolumns1, ncolumns2);
1342 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1343 if (my_extra == NULL ||
1344 my_extra->ncolumns < ncols)
1345 {
1346 fcinfo->flinfo->fn_extra =
1347 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
1348 offsetof(RecordCompareData, columns) +
1349 ncols * sizeof(ColumnCompareData));
1350 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1351 my_extra->ncolumns = ncols;
1352 my_extra->record1_type = InvalidOid;
1353 my_extra->record1_typmod = 0;
1354 my_extra->record2_type = InvalidOid;
1355 my_extra->record2_typmod = 0;
1356 }
1357
1358 if (my_extra->record1_type != tupType1 ||
1359 my_extra->record1_typmod != tupTypmod1 ||
1360 my_extra->record2_type != tupType2 ||
1361 my_extra->record2_typmod != tupTypmod2)
1362 {
1363 MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
1364 my_extra->record1_type = tupType1;
1365 my_extra->record1_typmod = tupTypmod1;
1366 my_extra->record2_type = tupType2;
1367 my_extra->record2_typmod = tupTypmod2;
1368 }
1369
1370 /* Break down the tuples into fields */
1371 values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
1372 nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
1373 heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
1374 values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
1375 nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
1376 heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
1377
1378 /*
1379 * Scan corresponding columns, allowing for dropped columns in different
1380 * places in the two rows. i1 and i2 are physical column indexes, j is
1381 * the logical column index.
1382 */
1383 i1 = i2 = j = 0;
1384 while (i1 < ncolumns1 || i2 < ncolumns2)
1385 {
1386 Form_pg_attribute att1;
1387 Form_pg_attribute att2;
1388
1389 /*
1390 * Skip dropped columns
1391 */
1392 if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
1393 {
1394 i1++;
1395 continue;
1396 }
1397 if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
1398 {
1399 i2++;
1400 continue;
1401 }
1402 if (i1 >= ncolumns1 || i2 >= ncolumns2)
1403 break; /* we'll deal with mismatch below loop */
1404
1405 att1 = TupleDescAttr(tupdesc1, i1);
1406 att2 = TupleDescAttr(tupdesc2, i2);
1407
1408 /*
1409 * Have two matching columns, they must be same type
1410 */
1411 if (att1->atttypid != att2->atttypid)
1412 ereport(ERROR,
1413 (errcode(ERRCODE_DATATYPE_MISMATCH),
1414 errmsg("cannot compare dissimilar column types %s and %s at record column %d",
1415 format_type_be(att1->atttypid),
1416 format_type_be(att2->atttypid),
1417 j + 1)));
1418
1419 /*
1420 * The same type should have the same length (or both should be
1421 * variable).
1422 */
1423 Assert(att1->attlen == att2->attlen);
1424
1425 /*
1426 * We consider two NULLs equal; NULL > not-NULL.
1427 */
1428 if (!nulls1[i1] || !nulls2[i2])
1429 {
1430 int cmpresult = 0;
1431
1432 if (nulls1[i1])
1433 {
1434 /* arg1 is greater than arg2 */
1435 result = 1;
1436 break;
1437 }
1438 if (nulls2[i2])
1439 {
1440 /* arg1 is less than arg2 */
1441 result = -1;
1442 break;
1443 }
1444
1445 /* Compare the pair of elements */
1446 if (att1->attbyval)
1447 {
1448 if (values1[i1] != values2[i2])
1449 cmpresult = (values1[i1] < values2[i2]) ? -1 : 1;
1450 }
1451 else if (att1->attlen > 0)
1452 {
1453 cmpresult = memcmp(DatumGetPointer(values1[i1]),
1454 DatumGetPointer(values2[i2]),
1455 att1->attlen);
1456 }
1457 else if (att1->attlen == -1)
1458 {
1459 Size len1,
1460 len2;
1461 struct varlena *arg1val;
1462 struct varlena *arg2val;
1463
1464 len1 = toast_raw_datum_size(values1[i1]);
1465 len2 = toast_raw_datum_size(values2[i2]);
1466 arg1val = PG_DETOAST_DATUM_PACKED(values1[i1]);
1467 arg2val = PG_DETOAST_DATUM_PACKED(values2[i2]);
1468
1469 cmpresult = memcmp(VARDATA_ANY(arg1val),
1470 VARDATA_ANY(arg2val),
1471 Min(len1, len2) - VARHDRSZ);
1472 if ((cmpresult == 0) && (len1 != len2))
1473 cmpresult = (len1 < len2) ? -1 : 1;
1474
1475 if ((Pointer) arg1val != (Pointer) values1[i1])
1476 pfree(arg1val);
1477 if ((Pointer) arg2val != (Pointer) values2[i2])
1478 pfree(arg2val);
1479 }
1480 else
1481 elog(ERROR, "unexpected attlen: %d", att1->attlen);
1482
1483 if (cmpresult < 0)
1484 {
1485 /* arg1 is less than arg2 */
1486 result = -1;
1487 break;
1488 }
1489 else if (cmpresult > 0)
1490 {
1491 /* arg1 is greater than arg2 */
1492 result = 1;
1493 break;
1494 }
1495 }
1496
1497 /* equal, so continue to next column */
1498 i1++, i2++, j++;
1499 }
1500
1501 /*
1502 * If we didn't break out of the loop early, check for column count
1503 * mismatch. (We do not report such mismatch if we found unequal column
1504 * values; is that a feature or a bug?)
1505 */
1506 if (result == 0)
1507 {
1508 if (i1 != ncolumns1 || i2 != ncolumns2)
1509 ereport(ERROR,
1510 (errcode(ERRCODE_DATATYPE_MISMATCH),
1511 errmsg("cannot compare record types with different numbers of columns")));
1512 }
1513
1514 pfree(values1);
1515 pfree(nulls1);
1516 pfree(values2);
1517 pfree(nulls2);
1518 ReleaseTupleDesc(tupdesc1);
1519 ReleaseTupleDesc(tupdesc2);
1520
1521 /* Avoid leaking memory when handed toasted input. */
1522 PG_FREE_IF_COPY(record1, 0);
1523 PG_FREE_IF_COPY(record2, 1);
1524
1525 return result;
1526 }
1527
1528 /*
1529 * record_image_eq :
1530 * compares two records for identical contents, based on byte images
1531 * result :
1532 * returns true if the records are identical, false otherwise.
1533 *
1534 * Note: we do not use record_image_cmp here, since we can avoid
1535 * de-toasting for unequal lengths this way.
1536 */
1537 Datum
record_image_eq(PG_FUNCTION_ARGS)1538 record_image_eq(PG_FUNCTION_ARGS)
1539 {
1540 HeapTupleHeader record1 = PG_GETARG_HEAPTUPLEHEADER(0);
1541 HeapTupleHeader record2 = PG_GETARG_HEAPTUPLEHEADER(1);
1542 bool result = true;
1543 Oid tupType1;
1544 Oid tupType2;
1545 int32 tupTypmod1;
1546 int32 tupTypmod2;
1547 TupleDesc tupdesc1;
1548 TupleDesc tupdesc2;
1549 HeapTupleData tuple1;
1550 HeapTupleData tuple2;
1551 int ncolumns1;
1552 int ncolumns2;
1553 RecordCompareData *my_extra;
1554 int ncols;
1555 Datum *values1;
1556 Datum *values2;
1557 bool *nulls1;
1558 bool *nulls2;
1559 int i1;
1560 int i2;
1561 int j;
1562
1563 /* Extract type info from the tuples */
1564 tupType1 = HeapTupleHeaderGetTypeId(record1);
1565 tupTypmod1 = HeapTupleHeaderGetTypMod(record1);
1566 tupdesc1 = lookup_rowtype_tupdesc(tupType1, tupTypmod1);
1567 ncolumns1 = tupdesc1->natts;
1568 tupType2 = HeapTupleHeaderGetTypeId(record2);
1569 tupTypmod2 = HeapTupleHeaderGetTypMod(record2);
1570 tupdesc2 = lookup_rowtype_tupdesc(tupType2, tupTypmod2);
1571 ncolumns2 = tupdesc2->natts;
1572
1573 /* Build temporary HeapTuple control structures */
1574 tuple1.t_len = HeapTupleHeaderGetDatumLength(record1);
1575 ItemPointerSetInvalid(&(tuple1.t_self));
1576 tuple1.t_tableOid = InvalidOid;
1577 tuple1.t_data = record1;
1578 tuple2.t_len = HeapTupleHeaderGetDatumLength(record2);
1579 ItemPointerSetInvalid(&(tuple2.t_self));
1580 tuple2.t_tableOid = InvalidOid;
1581 tuple2.t_data = record2;
1582
1583 /*
1584 * We arrange to look up the needed comparison info just once per series
1585 * of calls, assuming the record types don't change underneath us.
1586 */
1587 ncols = Max(ncolumns1, ncolumns2);
1588 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1589 if (my_extra == NULL ||
1590 my_extra->ncolumns < ncols)
1591 {
1592 fcinfo->flinfo->fn_extra =
1593 MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
1594 offsetof(RecordCompareData, columns) +
1595 ncols * sizeof(ColumnCompareData));
1596 my_extra = (RecordCompareData *) fcinfo->flinfo->fn_extra;
1597 my_extra->ncolumns = ncols;
1598 my_extra->record1_type = InvalidOid;
1599 my_extra->record1_typmod = 0;
1600 my_extra->record2_type = InvalidOid;
1601 my_extra->record2_typmod = 0;
1602 }
1603
1604 if (my_extra->record1_type != tupType1 ||
1605 my_extra->record1_typmod != tupTypmod1 ||
1606 my_extra->record2_type != tupType2 ||
1607 my_extra->record2_typmod != tupTypmod2)
1608 {
1609 MemSet(my_extra->columns, 0, ncols * sizeof(ColumnCompareData));
1610 my_extra->record1_type = tupType1;
1611 my_extra->record1_typmod = tupTypmod1;
1612 my_extra->record2_type = tupType2;
1613 my_extra->record2_typmod = tupTypmod2;
1614 }
1615
1616 /* Break down the tuples into fields */
1617 values1 = (Datum *) palloc(ncolumns1 * sizeof(Datum));
1618 nulls1 = (bool *) palloc(ncolumns1 * sizeof(bool));
1619 heap_deform_tuple(&tuple1, tupdesc1, values1, nulls1);
1620 values2 = (Datum *) palloc(ncolumns2 * sizeof(Datum));
1621 nulls2 = (bool *) palloc(ncolumns2 * sizeof(bool));
1622 heap_deform_tuple(&tuple2, tupdesc2, values2, nulls2);
1623
1624 /*
1625 * Scan corresponding columns, allowing for dropped columns in different
1626 * places in the two rows. i1 and i2 are physical column indexes, j is
1627 * the logical column index.
1628 */
1629 i1 = i2 = j = 0;
1630 while (i1 < ncolumns1 || i2 < ncolumns2)
1631 {
1632 Form_pg_attribute att1;
1633 Form_pg_attribute att2;
1634
1635 /*
1636 * Skip dropped columns
1637 */
1638 if (i1 < ncolumns1 && TupleDescAttr(tupdesc1, i1)->attisdropped)
1639 {
1640 i1++;
1641 continue;
1642 }
1643 if (i2 < ncolumns2 && TupleDescAttr(tupdesc2, i2)->attisdropped)
1644 {
1645 i2++;
1646 continue;
1647 }
1648 if (i1 >= ncolumns1 || i2 >= ncolumns2)
1649 break; /* we'll deal with mismatch below loop */
1650
1651 att1 = TupleDescAttr(tupdesc1, i1);
1652 att2 = TupleDescAttr(tupdesc2, i2);
1653
1654 /*
1655 * Have two matching columns, they must be same type
1656 */
1657 if (att1->atttypid != att2->atttypid)
1658 ereport(ERROR,
1659 (errcode(ERRCODE_DATATYPE_MISMATCH),
1660 errmsg("cannot compare dissimilar column types %s and %s at record column %d",
1661 format_type_be(att1->atttypid),
1662 format_type_be(att2->atttypid),
1663 j + 1)));
1664
1665 /*
1666 * We consider two NULLs equal; NULL > not-NULL.
1667 */
1668 if (!nulls1[i1] || !nulls2[i2])
1669 {
1670 if (nulls1[i1] || nulls2[i2])
1671 {
1672 result = false;
1673 break;
1674 }
1675
1676 /* Compare the pair of elements */
1677 result = datum_image_eq(values1[i1], values2[i2], att1->attbyval, att2->attlen);
1678 if (!result)
1679 break;
1680 }
1681
1682 /* equal, so continue to next column */
1683 i1++, i2++, j++;
1684 }
1685
1686 /*
1687 * If we didn't break out of the loop early, check for column count
1688 * mismatch. (We do not report such mismatch if we found unequal column
1689 * values; is that a feature or a bug?)
1690 */
1691 if (result)
1692 {
1693 if (i1 != ncolumns1 || i2 != ncolumns2)
1694 ereport(ERROR,
1695 (errcode(ERRCODE_DATATYPE_MISMATCH),
1696 errmsg("cannot compare record types with different numbers of columns")));
1697 }
1698
1699 pfree(values1);
1700 pfree(nulls1);
1701 pfree(values2);
1702 pfree(nulls2);
1703 ReleaseTupleDesc(tupdesc1);
1704 ReleaseTupleDesc(tupdesc2);
1705
1706 /* Avoid leaking memory when handed toasted input. */
1707 PG_FREE_IF_COPY(record1, 0);
1708 PG_FREE_IF_COPY(record2, 1);
1709
1710 PG_RETURN_BOOL(result);
1711 }
1712
1713 Datum
record_image_ne(PG_FUNCTION_ARGS)1714 record_image_ne(PG_FUNCTION_ARGS)
1715 {
1716 PG_RETURN_BOOL(!DatumGetBool(record_image_eq(fcinfo)));
1717 }
1718
1719 Datum
record_image_lt(PG_FUNCTION_ARGS)1720 record_image_lt(PG_FUNCTION_ARGS)
1721 {
1722 PG_RETURN_BOOL(record_image_cmp(fcinfo) < 0);
1723 }
1724
1725 Datum
record_image_gt(PG_FUNCTION_ARGS)1726 record_image_gt(PG_FUNCTION_ARGS)
1727 {
1728 PG_RETURN_BOOL(record_image_cmp(fcinfo) > 0);
1729 }
1730
1731 Datum
record_image_le(PG_FUNCTION_ARGS)1732 record_image_le(PG_FUNCTION_ARGS)
1733 {
1734 PG_RETURN_BOOL(record_image_cmp(fcinfo) <= 0);
1735 }
1736
1737 Datum
record_image_ge(PG_FUNCTION_ARGS)1738 record_image_ge(PG_FUNCTION_ARGS)
1739 {
1740 PG_RETURN_BOOL(record_image_cmp(fcinfo) >= 0);
1741 }
1742
1743 Datum
btrecordimagecmp(PG_FUNCTION_ARGS)1744 btrecordimagecmp(PG_FUNCTION_ARGS)
1745 {
1746 PG_RETURN_INT32(record_image_cmp(fcinfo));
1747 }
1748