Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * jsonb_gin.c
4 : * GIN support functions for jsonb
5 : *
6 : * Copyright (c) 2014-2020, PostgreSQL Global Development Group
7 : *
8 : * We provide two opclasses for jsonb indexing: jsonb_ops and jsonb_path_ops.
9 : * For their description see json.sgml and comments in jsonb.h.
10 : *
11 : * The operators support, among the others, "jsonb @? jsonpath" and
12 : * "jsonb @@ jsonpath". Expressions containing these operators are easily
13 : * expressed through each other.
14 : *
15 : * jb @? 'path' <=> jb @@ 'EXISTS(path)'
16 : * jb @@ 'expr' <=> jb @? '$ ? (expr)'
17 : *
18 : * Thus, we're going to consider only @@ operator, while regarding @? operator
19 : * the same is true for jb @@ 'EXISTS(path)'.
20 : *
21 : * Result of jsonpath query extraction is a tree, which leaf nodes are index
22 : * entries and non-leaf nodes are AND/OR logical expressions. Basically we
23 : * extract following statements out of jsonpath:
24 : *
25 : * 1) "accessors_chain = const",
26 : * 2) "EXISTS(accessors_chain)".
27 : *
28 : * Accessors chain may consist of .key, [*] and [index] accessors. jsonb_ops
29 : * additionally supports .* and .**.
30 : *
31 : * For now, both jsonb_ops and jsonb_path_ops supports only statements of
32 : * the 1st find. jsonb_ops might also support statements of the 2nd kind,
33 : * but given we have no statistics keys extracted from accessors chain
34 : * are likely non-selective. Therefore, we choose to not confuse optimizer
35 : * and skip statements of the 2nd kind altogether. In future versions that
36 : * might be changed.
37 : *
38 : * In jsonb_ops statement of the 1st kind is split into expression of AND'ed
39 : * keys and const. Sometimes const might be interpreted as both value or key
40 : * in jsonb_ops. Then statement of 1st kind is decomposed into the expression
41 : * below.
42 : *
43 : * key1 AND key2 AND ... AND keyN AND (const_as_value OR const_as_key)
44 : *
45 : * jsonb_path_ops transforms each statement of the 1st kind into single hash
46 : * entry below.
47 : *
48 : * HASH(key1, key2, ... , keyN, const)
49 : *
50 : * Despite statements of the 2nd kind are not supported by both jsonb_ops and
51 : * jsonb_path_ops, EXISTS(path) expressions might be still supported,
52 : * when statements of 1st kind could be extracted out of their filters.
53 : *
54 : * IDENTIFICATION
55 : * src/backend/utils/adt/jsonb_gin.c
56 : *
57 : *-------------------------------------------------------------------------
58 : */
59 :
60 : #include "postgres.h"
61 :
62 : #include "access/gin.h"
63 : #include "access/stratnum.h"
64 : #include "catalog/pg_collation.h"
65 : #include "catalog/pg_type.h"
66 : #include "common/hashfn.h"
67 : #include "miscadmin.h"
68 : #include "utils/builtins.h"
69 : #include "utils/jsonb.h"
70 : #include "utils/jsonpath.h"
71 : #include "utils/varlena.h"
72 :
73 : typedef struct PathHashStack
74 : {
75 : uint32 hash;
76 : struct PathHashStack *parent;
77 : } PathHashStack;
78 :
79 : /* Buffer for GIN entries */
80 : typedef struct GinEntries
81 : {
82 : Datum *buf;
83 : int count;
84 : int allocated;
85 : } GinEntries;
86 :
87 : typedef enum JsonPathGinNodeType
88 : {
89 : JSP_GIN_OR,
90 : JSP_GIN_AND,
91 : JSP_GIN_ENTRY
92 : } JsonPathGinNodeType;
93 :
94 : typedef struct JsonPathGinNode JsonPathGinNode;
95 :
96 : /* Node in jsonpath expression tree */
97 : struct JsonPathGinNode
98 : {
99 : JsonPathGinNodeType type;
100 : union
101 : {
102 : int nargs; /* valid for OR and AND nodes */
103 : int entryIndex; /* index in GinEntries array, valid for ENTRY
104 : * nodes after entries output */
105 : Datum entryDatum; /* path hash or key name/scalar, valid for
106 : * ENTRY nodes before entries output */
107 : } val;
108 : JsonPathGinNode *args[FLEXIBLE_ARRAY_MEMBER]; /* valid for OR and AND
109 : * nodes */
110 : };
111 :
112 : /*
113 : * jsonb_ops entry extracted from jsonpath item. Corresponding path item
114 : * may be: '.key', '.*', '.**', '[index]' or '[*]'.
115 : * Entry type is stored in 'type' field.
116 : */
117 : typedef struct JsonPathGinPathItem
118 : {
119 : struct JsonPathGinPathItem *parent;
120 : Datum keyName; /* key name (for '.key' path item) or NULL */
121 : JsonPathItemType type; /* type of jsonpath item */
122 : } JsonPathGinPathItem;
123 :
124 : /* GIN representation of the extracted json path */
125 : typedef union JsonPathGinPath
126 : {
127 : JsonPathGinPathItem *items; /* list of path items (jsonb_ops) */
128 : uint32 hash; /* hash of the path (jsonb_path_ops) */
129 : } JsonPathGinPath;
130 :
131 : typedef struct JsonPathGinContext JsonPathGinContext;
132 :
133 : /* Callback, which stores information about path item into JsonPathGinPath */
134 : typedef bool (*JsonPathGinAddPathItemFunc) (JsonPathGinPath *path,
135 : JsonPathItem *jsp);
136 :
137 : /*
138 : * Callback, which extracts set of nodes from statement of 1st kind
139 : * (scalar != NULL) or statement of 2nd kind (scalar == NULL).
140 : */
141 : typedef List *(*JsonPathGinExtractNodesFunc) (JsonPathGinContext *cxt,
142 : JsonPathGinPath path,
143 : JsonbValue *scalar,
144 : List *nodes);
145 :
146 : /* Context for jsonpath entries extraction */
147 : struct JsonPathGinContext
148 : {
149 : JsonPathGinAddPathItemFunc add_path_item;
150 : JsonPathGinExtractNodesFunc extract_nodes;
151 : bool lax;
152 : };
153 :
154 : static Datum make_text_key(char flag, const char *str, int len);
155 : static Datum make_scalar_key(const JsonbValue *scalarVal, bool is_key);
156 :
157 : static JsonPathGinNode *extract_jsp_bool_expr(JsonPathGinContext *cxt,
158 : JsonPathGinPath path, JsonPathItem *jsp, bool not);
159 :
160 :
161 : /* Initialize GinEntries struct */
162 : static void
163 7324 : init_gin_entries(GinEntries *entries, int preallocated)
164 : {
165 7324 : entries->allocated = preallocated;
166 7324 : entries->buf = preallocated ? palloc(sizeof(Datum) * preallocated) : NULL;
167 7324 : entries->count = 0;
168 7324 : }
169 :
170 : /* Add new entry to GinEntries */
171 : static int
172 58508 : add_gin_entry(GinEntries *entries, Datum entry)
173 : {
174 58508 : int id = entries->count;
175 :
176 58508 : if (entries->count >= entries->allocated)
177 : {
178 376 : if (entries->allocated)
179 : {
180 44 : entries->allocated *= 2;
181 44 : entries->buf = repalloc(entries->buf,
182 44 : sizeof(Datum) * entries->allocated);
183 : }
184 : else
185 : {
186 332 : entries->allocated = 8;
187 332 : entries->buf = palloc(sizeof(Datum) * entries->allocated);
188 : }
189 : }
190 :
191 58508 : entries->buf[entries->count++] = entry;
192 :
193 58508 : return id;
194 : }
195 :
196 : /*
197 : *
198 : * jsonb_ops GIN opclass support functions
199 : *
200 : */
201 :
202 : Datum
203 489756 : gin_compare_jsonb(PG_FUNCTION_ARGS)
204 : {
205 489756 : text *arg1 = PG_GETARG_TEXT_PP(0);
206 489756 : text *arg2 = PG_GETARG_TEXT_PP(1);
207 : int32 result;
208 : char *a1p,
209 : *a2p;
210 : int len1,
211 : len2;
212 :
213 489756 : a1p = VARDATA_ANY(arg1);
214 489756 : a2p = VARDATA_ANY(arg2);
215 :
216 489756 : len1 = VARSIZE_ANY_EXHDR(arg1);
217 489756 : len2 = VARSIZE_ANY_EXHDR(arg2);
218 :
219 : /* Compare text as bttextcmp does, but always using C collation */
220 489756 : result = varstr_cmp(a1p, len1, a2p, len2, C_COLLATION_OID);
221 :
222 489756 : PG_FREE_IF_COPY(arg1, 0);
223 489756 : PG_FREE_IF_COPY(arg2, 1);
224 :
225 489756 : PG_RETURN_INT32(result);
226 : }
227 :
228 : Datum
229 4140 : gin_extract_jsonb(PG_FUNCTION_ARGS)
230 : {
231 4140 : Jsonb *jb = (Jsonb *) PG_GETARG_JSONB_P(0);
232 4140 : int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
233 4140 : int total = JB_ROOT_COUNT(jb);
234 : JsonbIterator *it;
235 : JsonbValue v;
236 : JsonbIteratorToken r;
237 : GinEntries entries;
238 :
239 : /* If the root level is empty, we certainly have no keys */
240 4140 : if (total == 0)
241 : {
242 480 : *nentries = 0;
243 480 : PG_RETURN_POINTER(NULL);
244 : }
245 :
246 : /* Otherwise, use 2 * root count as initial estimate of result size */
247 3660 : init_gin_entries(&entries, 2 * total);
248 :
249 3660 : it = JsonbIteratorInit(&jb->root);
250 :
251 49620 : while ((r = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
252 : {
253 45960 : switch (r)
254 : {
255 19240 : case WJB_KEY:
256 19240 : add_gin_entry(&entries, make_scalar_key(&v, true));
257 19240 : break;
258 112 : case WJB_ELEM:
259 : /* Pretend string array elements are keys, see jsonb.h */
260 112 : add_gin_entry(&entries, make_scalar_key(&v, v.type == jbvString));
261 112 : break;
262 19192 : case WJB_VALUE:
263 19192 : add_gin_entry(&entries, make_scalar_key(&v, false));
264 19192 : break;
265 7416 : default:
266 : /* we can ignore structural items */
267 7416 : break;
268 : }
269 : }
270 :
271 3660 : *nentries = entries.count;
272 :
273 3660 : PG_RETURN_POINTER(entries.buf);
274 : }
275 :
276 : /* Append JsonPathGinPathItem to JsonPathGinPath (jsonb_ops) */
277 : static bool
278 568 : jsonb_ops__add_path_item(JsonPathGinPath *path, JsonPathItem *jsp)
279 : {
280 : JsonPathGinPathItem *pentry;
281 : Datum keyName;
282 :
283 568 : switch (jsp->type)
284 : {
285 256 : case jpiRoot:
286 256 : path->items = NULL; /* reset path */
287 256 : return true;
288 :
289 248 : case jpiKey:
290 : {
291 : int len;
292 248 : char *key = jspGetString(jsp, &len);
293 :
294 248 : keyName = make_text_key(JGINFLAG_KEY, key, len);
295 248 : break;
296 : }
297 :
298 64 : case jpiAny:
299 : case jpiAnyKey:
300 : case jpiAnyArray:
301 : case jpiIndexArray:
302 64 : keyName = PointerGetDatum(NULL);
303 64 : break;
304 :
305 0 : default:
306 : /* other path items like item methods are not supported */
307 0 : return false;
308 : }
309 :
310 312 : pentry = palloc(sizeof(*pentry));
311 :
312 312 : pentry->type = jsp->type;
313 312 : pentry->keyName = keyName;
314 312 : pentry->parent = path->items;
315 :
316 312 : path->items = pentry;
317 :
318 312 : return true;
319 : }
320 :
321 : /* Combine existing path hash with next key hash (jsonb_path_ops) */
322 : static bool
323 464 : jsonb_path_ops__add_path_item(JsonPathGinPath *path, JsonPathItem *jsp)
324 : {
325 464 : switch (jsp->type)
326 : {
327 204 : case jpiRoot:
328 204 : path->hash = 0; /* reset path hash */
329 204 : return true;
330 :
331 196 : case jpiKey:
332 : {
333 : JsonbValue jbv;
334 :
335 196 : jbv.type = jbvString;
336 196 : jbv.val.string.val = jspGetString(jsp, &jbv.val.string.len);
337 :
338 196 : JsonbHashScalarValue(&jbv, &path->hash);
339 196 : return true;
340 : }
341 :
342 64 : case jpiIndexArray:
343 : case jpiAnyArray:
344 64 : return true; /* path hash is unchanged */
345 :
346 0 : default:
347 : /* other items (wildcard paths, item methods) are not supported */
348 0 : return false;
349 : }
350 : }
351 :
352 : static JsonPathGinNode *
353 644 : make_jsp_entry_node(Datum entry)
354 : {
355 644 : JsonPathGinNode *node = palloc(offsetof(JsonPathGinNode, args));
356 :
357 644 : node->type = JSP_GIN_ENTRY;
358 644 : node->val.entryDatum = entry;
359 :
360 644 : return node;
361 : }
362 :
363 : static JsonPathGinNode *
364 280 : make_jsp_entry_node_scalar(JsonbValue *scalar, bool iskey)
365 : {
366 280 : return make_jsp_entry_node(make_scalar_key(scalar, iskey));
367 : }
368 :
369 : static JsonPathGinNode *
370 312 : make_jsp_expr_node(JsonPathGinNodeType type, int nargs)
371 : {
372 312 : JsonPathGinNode *node = palloc(offsetof(JsonPathGinNode, args) +
373 : sizeof(node->args[0]) * nargs);
374 :
375 312 : node->type = type;
376 312 : node->val.nargs = nargs;
377 :
378 312 : return node;
379 : }
380 :
381 : static JsonPathGinNode *
382 184 : make_jsp_expr_node_args(JsonPathGinNodeType type, List *args)
383 : {
384 184 : JsonPathGinNode *node = make_jsp_expr_node(type, list_length(args));
385 : ListCell *lc;
386 184 : int i = 0;
387 :
388 552 : foreach(lc, args)
389 368 : node->args[i++] = lfirst(lc);
390 :
391 184 : return node;
392 : }
393 :
394 : static JsonPathGinNode *
395 128 : make_jsp_expr_node_binary(JsonPathGinNodeType type,
396 : JsonPathGinNode *arg1, JsonPathGinNode *arg2)
397 : {
398 128 : JsonPathGinNode *node = make_jsp_expr_node(type, 2);
399 :
400 128 : node->args[0] = arg1;
401 128 : node->args[1] = arg2;
402 :
403 128 : return node;
404 : }
405 :
406 : /* Append a list of nodes from the jsonpath (jsonb_ops). */
407 : static List *
408 372 : jsonb_ops__extract_nodes(JsonPathGinContext *cxt, JsonPathGinPath path,
409 : JsonbValue *scalar, List *nodes)
410 : {
411 : JsonPathGinPathItem *pentry;
412 :
413 372 : if (scalar)
414 : {
415 : JsonPathGinNode *node;
416 :
417 : /*
418 : * Append path entry nodes only if scalar is provided. See header
419 : * comment for details.
420 : */
421 432 : for (pentry = path.items; pentry; pentry = pentry->parent)
422 : {
423 248 : if (pentry->type == jpiKey) /* only keys are indexed */
424 184 : nodes = lappend(nodes, make_jsp_entry_node(pentry->keyName));
425 : }
426 :
427 : /* Append scalar node for equality queries. */
428 184 : if (scalar->type == jbvString)
429 : {
430 96 : JsonPathGinPathItem *last = path.items;
431 : GinTernaryValue key_entry;
432 :
433 : /*
434 : * Assuming that jsonb_ops interprets string array elements as
435 : * keys, we may extract key or non-key entry or even both. In the
436 : * latter case we create OR-node. It is possible in lax mode
437 : * where arrays are automatically unwrapped, or in strict mode for
438 : * jpiAny items.
439 : */
440 :
441 96 : if (cxt->lax)
442 96 : key_entry = GIN_MAYBE;
443 0 : else if (!last) /* root ($) */
444 0 : key_entry = GIN_FALSE;
445 0 : else if (last->type == jpiAnyArray || last->type == jpiIndexArray)
446 0 : key_entry = GIN_TRUE;
447 0 : else if (last->type == jpiAny)
448 0 : key_entry = GIN_MAYBE;
449 : else
450 0 : key_entry = GIN_FALSE;
451 :
452 96 : if (key_entry == GIN_MAYBE)
453 : {
454 96 : JsonPathGinNode *n1 = make_jsp_entry_node_scalar(scalar, true);
455 96 : JsonPathGinNode *n2 = make_jsp_entry_node_scalar(scalar, false);
456 :
457 96 : node = make_jsp_expr_node_binary(JSP_GIN_OR, n1, n2);
458 : }
459 : else
460 : {
461 0 : node = make_jsp_entry_node_scalar(scalar,
462 : key_entry == GIN_TRUE);
463 : }
464 : }
465 : else
466 : {
467 88 : node = make_jsp_entry_node_scalar(scalar, false);
468 : }
469 :
470 184 : nodes = lappend(nodes, node);
471 : }
472 :
473 372 : return nodes;
474 : }
475 :
476 : /* Append a list of nodes from the jsonpath (jsonb_path_ops). */
477 : static List *
478 320 : jsonb_path_ops__extract_nodes(JsonPathGinContext *cxt, JsonPathGinPath path,
479 : JsonbValue *scalar, List *nodes)
480 : {
481 320 : if (scalar)
482 : {
483 : /* append path hash node for equality queries */
484 180 : uint32 hash = path.hash;
485 :
486 180 : JsonbHashScalarValue(scalar, &hash);
487 :
488 180 : return lappend(nodes,
489 180 : make_jsp_entry_node(UInt32GetDatum(hash)));
490 : }
491 : else
492 : {
493 : /* jsonb_path_ops doesn't support EXISTS queries => nothing to append */
494 140 : return nodes;
495 : }
496 : }
497 :
498 : /*
499 : * Extract a list of expression nodes that need to be AND-ed by the caller.
500 : * Extracted expression is 'path == scalar' if 'scalar' is non-NULL, and
501 : * 'EXISTS(path)' otherwise.
502 : */
503 : static List *
504 692 : extract_jsp_path_expr_nodes(JsonPathGinContext *cxt, JsonPathGinPath path,
505 : JsonPathItem *jsp, JsonbValue *scalar)
506 : {
507 : JsonPathItem next;
508 692 : List *nodes = NIL;
509 :
510 : for (;;)
511 : {
512 1480 : switch (jsp->type)
513 : {
514 232 : case jpiCurrent:
515 232 : break;
516 :
517 216 : case jpiFilter:
518 : {
519 : JsonPathItem arg;
520 : JsonPathGinNode *filter;
521 :
522 216 : jspGetArg(jsp, &arg);
523 :
524 216 : filter = extract_jsp_bool_expr(cxt, path, &arg, false);
525 :
526 216 : if (filter)
527 216 : nodes = lappend(nodes, filter);
528 :
529 216 : break;
530 : }
531 :
532 1032 : default:
533 1032 : if (!cxt->add_path_item(&path, jsp))
534 :
535 : /*
536 : * Path is not supported by the index opclass, return only
537 : * the extracted filter nodes.
538 : */
539 0 : return nodes;
540 1032 : break;
541 : }
542 :
543 1480 : if (!jspGetNext(jsp, &next))
544 692 : break;
545 :
546 788 : jsp = &next;
547 : }
548 :
549 : /*
550 : * Append nodes from the path expression itself to the already extracted
551 : * list of filter nodes.
552 : */
553 692 : return cxt->extract_nodes(cxt, path, scalar, nodes);
554 : }
555 :
556 : /*
557 : * Extract an expression node from one of following jsonpath path expressions:
558 : * EXISTS(jsp) (when 'scalar' is NULL)
559 : * jsp == scalar (when 'scalar' is not NULL).
560 : *
561 : * The current path (@) is passed in 'path'.
562 : */
563 : static JsonPathGinNode *
564 692 : extract_jsp_path_expr(JsonPathGinContext *cxt, JsonPathGinPath path,
565 : JsonPathItem *jsp, JsonbValue *scalar)
566 : {
567 : /* extract a list of nodes to be AND-ed */
568 692 : List *nodes = extract_jsp_path_expr_nodes(cxt, path, jsp, scalar);
569 :
570 692 : if (list_length(nodes) <= 0)
571 : /* no nodes were extracted => full scan is needed for this path */
572 112 : return NULL;
573 :
574 580 : if (list_length(nodes) == 1)
575 396 : return linitial(nodes); /* avoid extra AND-node */
576 :
577 : /* construct AND-node for path with filters */
578 184 : return make_jsp_expr_node_args(JSP_GIN_AND, nodes);
579 : }
580 :
581 : /* Recursively extract nodes from the boolean jsonpath expression. */
582 : static JsonPathGinNode *
583 556 : extract_jsp_bool_expr(JsonPathGinContext *cxt, JsonPathGinPath path,
584 : JsonPathItem *jsp, bool not)
585 : {
586 556 : check_stack_depth();
587 :
588 556 : switch (jsp->type)
589 : {
590 48 : case jpiAnd: /* expr && expr */
591 : case jpiOr: /* expr || expr */
592 : {
593 : JsonPathItem arg;
594 : JsonPathGinNode *larg;
595 : JsonPathGinNode *rarg;
596 : JsonPathGinNodeType type;
597 :
598 48 : jspGetLeftArg(jsp, &arg);
599 48 : larg = extract_jsp_bool_expr(cxt, path, &arg, not);
600 :
601 48 : jspGetRightArg(jsp, &arg);
602 48 : rarg = extract_jsp_bool_expr(cxt, path, &arg, not);
603 :
604 48 : if (!larg || !rarg)
605 : {
606 16 : if (jsp->type == jpiOr)
607 8 : return NULL;
608 :
609 8 : return larg ? larg : rarg;
610 : }
611 :
612 32 : type = not ^ (jsp->type == jpiAnd) ? JSP_GIN_AND : JSP_GIN_OR;
613 :
614 32 : return make_jsp_expr_node_binary(type, larg, rarg);
615 : }
616 :
617 0 : case jpiNot: /* !expr */
618 : {
619 : JsonPathItem arg;
620 :
621 0 : jspGetArg(jsp, &arg);
622 :
623 : /* extract child expression inverting 'not' flag */
624 0 : return extract_jsp_bool_expr(cxt, path, &arg, !not);
625 : }
626 :
627 144 : case jpiExists: /* EXISTS(path) */
628 : {
629 : JsonPathItem arg;
630 :
631 144 : if (not)
632 0 : return NULL; /* NOT EXISTS is not supported */
633 :
634 144 : jspGetArg(jsp, &arg);
635 :
636 144 : return extract_jsp_path_expr(cxt, path, &arg, NULL);
637 : }
638 :
639 0 : case jpiNotEqual:
640 :
641 : /*
642 : * 'not' == true case is not supported here because '!(path !=
643 : * scalar)' is not equivalent to 'path == scalar' in the general
644 : * case because of sequence comparison semantics: 'path == scalar'
645 : * === 'EXISTS (path, @ == scalar)', '!(path != scalar)' ===
646 : * 'FOR_ALL(path, @ == scalar)'. So, we should translate '!(path
647 : * != scalar)' into GIN query 'path == scalar || EMPTY(path)', but
648 : * 'EMPTY(path)' queries are not supported by the both jsonb
649 : * opclasses. However in strict mode we could omit 'EMPTY(path)'
650 : * part if the path can return exactly one item (it does not
651 : * contain wildcard accessors or item methods like .keyvalue()
652 : * etc.).
653 : */
654 0 : return NULL;
655 :
656 364 : case jpiEqual: /* path == scalar */
657 : {
658 : JsonPathItem left_item;
659 : JsonPathItem right_item;
660 : JsonPathItem *path_item;
661 : JsonPathItem *scalar_item;
662 : JsonbValue scalar;
663 :
664 364 : if (not)
665 0 : return NULL;
666 :
667 364 : jspGetLeftArg(jsp, &left_item);
668 364 : jspGetRightArg(jsp, &right_item);
669 :
670 364 : if (jspIsScalar(left_item.type))
671 : {
672 64 : scalar_item = &left_item;
673 64 : path_item = &right_item;
674 : }
675 300 : else if (jspIsScalar(right_item.type))
676 : {
677 300 : scalar_item = &right_item;
678 300 : path_item = &left_item;
679 : }
680 : else
681 0 : return NULL; /* at least one operand should be a scalar */
682 :
683 364 : switch (scalar_item->type)
684 : {
685 76 : case jpiNull:
686 76 : scalar.type = jbvNull;
687 76 : break;
688 32 : case jpiBool:
689 32 : scalar.type = jbvBool;
690 32 : scalar.val.boolean = !!*scalar_item->content.value.data;
691 32 : break;
692 64 : case jpiNumeric:
693 64 : scalar.type = jbvNumeric;
694 64 : scalar.val.numeric =
695 64 : (Numeric) scalar_item->content.value.data;
696 64 : break;
697 192 : case jpiString:
698 192 : scalar.type = jbvString;
699 192 : scalar.val.string.val = scalar_item->content.value.data;
700 192 : scalar.val.string.len =
701 192 : scalar_item->content.value.datalen;
702 192 : break;
703 0 : default:
704 0 : elog(ERROR, "invalid scalar jsonpath item type: %d",
705 : scalar_item->type);
706 : return NULL;
707 : }
708 :
709 364 : return extract_jsp_path_expr(cxt, path, path_item, &scalar);
710 : }
711 :
712 0 : default:
713 0 : return NULL; /* not a boolean expression */
714 : }
715 : }
716 :
717 : /* Recursively emit all GIN entries found in the node tree */
718 : static void
719 956 : emit_jsp_gin_entries(JsonPathGinNode *node, GinEntries *entries)
720 : {
721 956 : check_stack_depth();
722 :
723 956 : switch (node->type)
724 : {
725 644 : case JSP_GIN_ENTRY:
726 : /* replace datum with its index in the array */
727 644 : node->val.entryIndex = add_gin_entry(entries, node->val.entryDatum);
728 644 : break;
729 :
730 312 : case JSP_GIN_OR:
731 : case JSP_GIN_AND:
732 : {
733 : int i;
734 :
735 936 : for (i = 0; i < node->val.nargs; i++)
736 624 : emit_jsp_gin_entries(node->args[i], entries);
737 :
738 312 : break;
739 : }
740 : }
741 956 : }
742 :
743 : /*
744 : * Recursively extract GIN entries from jsonpath query.
745 : * Root expression node is put into (*extra_data)[0].
746 : */
747 : static Datum *
748 428 : extract_jsp_query(JsonPath *jp, StrategyNumber strat, bool pathOps,
749 : int32 *nentries, Pointer **extra_data)
750 : {
751 : JsonPathGinContext cxt;
752 : JsonPathItem root;
753 : JsonPathGinNode *node;
754 428 : JsonPathGinPath path = {0};
755 428 : GinEntries entries = {0};
756 :
757 428 : cxt.lax = (jp->header & JSONPATH_LAX) != 0;
758 :
759 428 : if (pathOps)
760 : {
761 196 : cxt.add_path_item = jsonb_path_ops__add_path_item;
762 196 : cxt.extract_nodes = jsonb_path_ops__extract_nodes;
763 : }
764 : else
765 : {
766 232 : cxt.add_path_item = jsonb_ops__add_path_item;
767 232 : cxt.extract_nodes = jsonb_ops__extract_nodes;
768 : }
769 :
770 428 : jspInit(&root, jp);
771 :
772 428 : node = strat == JsonbJsonpathExistsStrategyNumber
773 184 : ? extract_jsp_path_expr(&cxt, path, &root, NULL)
774 428 : : extract_jsp_bool_expr(&cxt, path, &root, false);
775 :
776 428 : if (!node)
777 : {
778 96 : *nentries = 0;
779 96 : return NULL;
780 : }
781 :
782 332 : emit_jsp_gin_entries(node, &entries);
783 :
784 332 : *nentries = entries.count;
785 332 : if (!*nentries)
786 0 : return NULL;
787 :
788 332 : *extra_data = palloc0(sizeof(**extra_data) * entries.count);
789 332 : **extra_data = (Pointer) node;
790 :
791 332 : return entries.buf;
792 : }
793 :
794 : /*
795 : * Recursively execute jsonpath expression.
796 : * 'check' is a bool[] or a GinTernaryValue[] depending on 'ternary' flag.
797 : */
798 : static GinTernaryValue
799 8408 : execute_jsp_gin_node(JsonPathGinNode *node, void *check, bool ternary)
800 : {
801 : GinTernaryValue res;
802 : GinTernaryValue v;
803 : int i;
804 :
805 8408 : switch (node->type)
806 : {
807 3392 : case JSP_GIN_AND:
808 3392 : res = GIN_TRUE;
809 5376 : for (i = 0; i < node->val.nargs; i++)
810 : {
811 4592 : v = execute_jsp_gin_node(node->args[i], check, ternary);
812 4592 : if (v == GIN_FALSE)
813 2608 : return GIN_FALSE;
814 1984 : else if (v == GIN_MAYBE)
815 160 : res = GIN_MAYBE;
816 : }
817 784 : return res;
818 :
819 704 : case JSP_GIN_OR:
820 704 : res = GIN_FALSE;
821 1440 : for (i = 0; i < node->val.nargs; i++)
822 : {
823 1312 : v = execute_jsp_gin_node(node->args[i], check, ternary);
824 1312 : if (v == GIN_TRUE)
825 576 : return GIN_TRUE;
826 736 : else if (v == GIN_MAYBE)
827 48 : res = GIN_MAYBE;
828 : }
829 128 : return res;
830 :
831 4312 : case JSP_GIN_ENTRY:
832 : {
833 4312 : int index = node->val.entryIndex;
834 :
835 4312 : if (ternary)
836 4312 : return ((GinTernaryValue *) check)[index];
837 : else
838 0 : return ((bool *) check)[index] ? GIN_TRUE : GIN_FALSE;
839 : }
840 :
841 0 : default:
842 0 : elog(ERROR, "invalid jsonpath gin node type: %d", node->type);
843 : return GIN_FALSE; /* keep compiler quiet */
844 : }
845 : }
846 :
847 : Datum
848 352 : gin_extract_jsonb_query(PG_FUNCTION_ARGS)
849 : {
850 352 : int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
851 352 : StrategyNumber strategy = PG_GETARG_UINT16(2);
852 352 : int32 *searchMode = (int32 *) PG_GETARG_POINTER(6);
853 : Datum *entries;
854 :
855 352 : if (strategy == JsonbContainsStrategyNumber)
856 : {
857 : /* Query is a jsonb, so just apply gin_extract_jsonb... */
858 72 : entries = (Datum *)
859 72 : DatumGetPointer(DirectFunctionCall2(gin_extract_jsonb,
860 : PG_GETARG_DATUM(0),
861 : PointerGetDatum(nentries)));
862 : /* ...although "contains {}" requires a full index scan */
863 72 : if (*nentries == 0)
864 8 : *searchMode = GIN_SEARCH_MODE_ALL;
865 : }
866 280 : else if (strategy == JsonbExistsStrategyNumber)
867 : {
868 : /* Query is a text string, which we treat as a key */
869 32 : text *query = PG_GETARG_TEXT_PP(0);
870 :
871 32 : *nentries = 1;
872 32 : entries = (Datum *) palloc(sizeof(Datum));
873 64 : entries[0] = make_text_key(JGINFLAG_KEY,
874 32 : VARDATA_ANY(query),
875 32 : VARSIZE_ANY_EXHDR(query));
876 : }
877 248 : else if (strategy == JsonbExistsAnyStrategyNumber ||
878 : strategy == JsonbExistsAllStrategyNumber)
879 16 : {
880 : /* Query is a text array; each element is treated as a key */
881 16 : ArrayType *query = PG_GETARG_ARRAYTYPE_P(0);
882 : Datum *key_datums;
883 : bool *key_nulls;
884 : int key_count;
885 : int i,
886 : j;
887 :
888 16 : deconstruct_array(query,
889 : TEXTOID, -1, false, TYPALIGN_INT,
890 : &key_datums, &key_nulls, &key_count);
891 :
892 16 : entries = (Datum *) palloc(sizeof(Datum) * key_count);
893 :
894 48 : for (i = 0, j = 0; i < key_count; i++)
895 : {
896 : /* Nulls in the array are ignored */
897 32 : if (key_nulls[i])
898 0 : continue;
899 32 : entries[j++] = make_text_key(JGINFLAG_KEY,
900 32 : VARDATA(key_datums[i]),
901 32 : VARSIZE(key_datums[i]) - VARHDRSZ);
902 : }
903 :
904 16 : *nentries = j;
905 : /* ExistsAll with no keys should match everything */
906 16 : if (j == 0 && strategy == JsonbExistsAllStrategyNumber)
907 0 : *searchMode = GIN_SEARCH_MODE_ALL;
908 : }
909 232 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
910 : strategy == JsonbJsonpathExistsStrategyNumber)
911 232 : {
912 232 : JsonPath *jp = PG_GETARG_JSONPATH_P(0);
913 232 : Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4);
914 :
915 232 : entries = extract_jsp_query(jp, strategy, false, nentries, extra_data);
916 :
917 232 : if (!entries)
918 64 : *searchMode = GIN_SEARCH_MODE_ALL;
919 : }
920 : else
921 : {
922 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
923 : entries = NULL; /* keep compiler quiet */
924 : }
925 :
926 352 : PG_RETURN_POINTER(entries);
927 : }
928 :
929 : Datum
930 0 : gin_consistent_jsonb(PG_FUNCTION_ARGS)
931 : {
932 0 : bool *check = (bool *) PG_GETARG_POINTER(0);
933 0 : StrategyNumber strategy = PG_GETARG_UINT16(1);
934 :
935 : /* Jsonb *query = PG_GETARG_JSONB_P(2); */
936 0 : int32 nkeys = PG_GETARG_INT32(3);
937 :
938 0 : Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
939 0 : bool *recheck = (bool *) PG_GETARG_POINTER(5);
940 0 : bool res = true;
941 : int32 i;
942 :
943 0 : if (strategy == JsonbContainsStrategyNumber)
944 : {
945 : /*
946 : * We must always recheck, since we can't tell from the index whether
947 : * the positions of the matched items match the structure of the query
948 : * object. (Even if we could, we'd also have to worry about hashed
949 : * keys and the index's failure to distinguish keys from string array
950 : * elements.) However, the tuple certainly doesn't match unless it
951 : * contains all the query keys.
952 : */
953 0 : *recheck = true;
954 0 : for (i = 0; i < nkeys; i++)
955 : {
956 0 : if (!check[i])
957 : {
958 0 : res = false;
959 0 : break;
960 : }
961 : }
962 : }
963 0 : else if (strategy == JsonbExistsStrategyNumber)
964 : {
965 : /*
966 : * Although the key is certainly present in the index, we must recheck
967 : * because (1) the key might be hashed, and (2) the index match might
968 : * be for a key that's not at top level of the JSON object. For (1),
969 : * we could look at the query key to see if it's hashed and not
970 : * recheck if not, but the index lacks enough info to tell about (2).
971 : */
972 0 : *recheck = true;
973 0 : res = true;
974 : }
975 0 : else if (strategy == JsonbExistsAnyStrategyNumber)
976 : {
977 : /* As for plain exists, we must recheck */
978 0 : *recheck = true;
979 0 : res = true;
980 : }
981 0 : else if (strategy == JsonbExistsAllStrategyNumber)
982 : {
983 : /* As for plain exists, we must recheck */
984 0 : *recheck = true;
985 : /* ... but unless all the keys are present, we can say "false" */
986 0 : for (i = 0; i < nkeys; i++)
987 : {
988 0 : if (!check[i])
989 : {
990 0 : res = false;
991 0 : break;
992 : }
993 : }
994 : }
995 0 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
996 : strategy == JsonbJsonpathExistsStrategyNumber)
997 : {
998 0 : *recheck = true;
999 :
1000 0 : if (nkeys > 0)
1001 : {
1002 : Assert(extra_data && extra_data[0]);
1003 0 : res = execute_jsp_gin_node((JsonPathGinNode *) extra_data[0], check,
1004 : false) != GIN_FALSE;
1005 : }
1006 : }
1007 : else
1008 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
1009 :
1010 0 : PG_RETURN_BOOL(res);
1011 : }
1012 :
1013 : Datum
1014 42428 : gin_triconsistent_jsonb(PG_FUNCTION_ARGS)
1015 : {
1016 42428 : GinTernaryValue *check = (GinTernaryValue *) PG_GETARG_POINTER(0);
1017 42428 : StrategyNumber strategy = PG_GETARG_UINT16(1);
1018 :
1019 : /* Jsonb *query = PG_GETARG_JSONB_P(2); */
1020 42428 : int32 nkeys = PG_GETARG_INT32(3);
1021 42428 : Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
1022 42428 : GinTernaryValue res = GIN_MAYBE;
1023 : int32 i;
1024 :
1025 : /*
1026 : * Note that we never return GIN_TRUE, only GIN_MAYBE or GIN_FALSE; this
1027 : * corresponds to always forcing recheck in the regular consistent
1028 : * function, for the reasons listed there.
1029 : */
1030 48200 : if (strategy == JsonbContainsStrategyNumber ||
1031 : strategy == JsonbExistsAllStrategyNumber)
1032 : {
1033 : /* All extracted keys must be present */
1034 6760 : for (i = 0; i < nkeys; i++)
1035 : {
1036 2356 : if (check[i] == GIN_FALSE)
1037 : {
1038 1368 : res = GIN_FALSE;
1039 1368 : break;
1040 : }
1041 : }
1042 : }
1043 38816 : else if (strategy == JsonbExistsStrategyNumber ||
1044 : strategy == JsonbExistsAnyStrategyNumber)
1045 : {
1046 : /* At least one extracted key must be present */
1047 2160 : res = GIN_FALSE;
1048 2732 : for (i = 0; i < nkeys; i++)
1049 : {
1050 2732 : if (check[i] == GIN_TRUE ||
1051 576 : check[i] == GIN_MAYBE)
1052 : {
1053 2160 : res = GIN_MAYBE;
1054 2160 : break;
1055 : }
1056 : }
1057 : }
1058 34496 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
1059 : strategy == JsonbJsonpathExistsStrategyNumber)
1060 : {
1061 36608 : if (nkeys > 0)
1062 : {
1063 : Assert(extra_data && extra_data[0]);
1064 2112 : res = execute_jsp_gin_node((JsonPathGinNode *) extra_data[0], check,
1065 : true);
1066 :
1067 : /* Should always recheck the result */
1068 2112 : if (res == GIN_TRUE)
1069 424 : res = GIN_MAYBE;
1070 : }
1071 : }
1072 : else
1073 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
1074 :
1075 42428 : PG_RETURN_GIN_TERNARY_VALUE(res);
1076 : }
1077 :
1078 : /*
1079 : *
1080 : * jsonb_path_ops GIN opclass support functions
1081 : *
1082 : * In a jsonb_path_ops index, the GIN keys are uint32 hashes, one per JSON
1083 : * value; but the JSON key(s) leading to each value are also included in its
1084 : * hash computation. This means we can only support containment queries,
1085 : * but the index can distinguish, for example, {"foo": 42} from {"bar": 42}
1086 : * since different hashes will be generated.
1087 : *
1088 : */
1089 :
1090 : Datum
1091 4144 : gin_extract_jsonb_path(PG_FUNCTION_ARGS)
1092 : {
1093 4144 : Jsonb *jb = PG_GETARG_JSONB_P(0);
1094 4144 : int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
1095 4144 : int total = JB_ROOT_COUNT(jb);
1096 : JsonbIterator *it;
1097 : JsonbValue v;
1098 : JsonbIteratorToken r;
1099 : PathHashStack tail;
1100 : PathHashStack *stack;
1101 : GinEntries entries;
1102 :
1103 : /* If the root level is empty, we certainly have no keys */
1104 4144 : if (total == 0)
1105 : {
1106 480 : *nentries = 0;
1107 480 : PG_RETURN_POINTER(NULL);
1108 : }
1109 :
1110 : /* Otherwise, use 2 * root count as initial estimate of result size */
1111 3664 : init_gin_entries(&entries, 2 * total);
1112 :
1113 : /* We keep a stack of partial hashes corresponding to parent key levels */
1114 3664 : tail.parent = NULL;
1115 3664 : tail.hash = 0;
1116 3664 : stack = &tail;
1117 :
1118 3664 : it = JsonbIteratorInit(&jb->root);
1119 :
1120 49804 : while ((r = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
1121 : {
1122 : PathHashStack *parent;
1123 :
1124 46140 : switch (r)
1125 : {
1126 3772 : case WJB_BEGIN_ARRAY:
1127 : case WJB_BEGIN_OBJECT:
1128 : /* Push a stack level for this object */
1129 3772 : parent = stack;
1130 3772 : stack = (PathHashStack *) palloc(sizeof(PathHashStack));
1131 :
1132 : /*
1133 : * We pass forward hashes from outer nesting levels so that
1134 : * the hashes for nested values will include outer keys as
1135 : * well as their own keys.
1136 : *
1137 : * Nesting an array within another array will not alter
1138 : * innermost scalar element hash values, but that seems
1139 : * inconsequential.
1140 : */
1141 3772 : stack->hash = parent->hash;
1142 3772 : stack->parent = parent;
1143 3772 : break;
1144 19276 : case WJB_KEY:
1145 : /* mix this key into the current outer hash */
1146 19276 : JsonbHashScalarValue(&v, &stack->hash);
1147 : /* hash is now ready to incorporate the value */
1148 19276 : break;
1149 19320 : case WJB_ELEM:
1150 : case WJB_VALUE:
1151 : /* mix the element or value's hash into the prepared hash */
1152 19320 : JsonbHashScalarValue(&v, &stack->hash);
1153 : /* and emit an index entry */
1154 19320 : add_gin_entry(&entries, UInt32GetDatum(stack->hash));
1155 : /* reset hash for next key, value, or sub-object */
1156 19320 : stack->hash = stack->parent->hash;
1157 19320 : break;
1158 3772 : case WJB_END_ARRAY:
1159 : case WJB_END_OBJECT:
1160 : /* Pop the stack */
1161 3772 : parent = stack->parent;
1162 3772 : pfree(stack);
1163 3772 : stack = parent;
1164 : /* reset hash for next key, value, or sub-object */
1165 3772 : if (stack->parent)
1166 108 : stack->hash = stack->parent->hash;
1167 : else
1168 3664 : stack->hash = 0;
1169 3772 : break;
1170 0 : default:
1171 0 : elog(ERROR, "invalid JsonbIteratorNext rc: %d", (int) r);
1172 : }
1173 : }
1174 :
1175 3664 : *nentries = entries.count;
1176 :
1177 3664 : PG_RETURN_POINTER(entries.buf);
1178 : }
1179 :
1180 : Datum
1181 280 : gin_extract_jsonb_query_path(PG_FUNCTION_ARGS)
1182 : {
1183 280 : int32 *nentries = (int32 *) PG_GETARG_POINTER(1);
1184 280 : StrategyNumber strategy = PG_GETARG_UINT16(2);
1185 280 : int32 *searchMode = (int32 *) PG_GETARG_POINTER(6);
1186 : Datum *entries;
1187 :
1188 280 : if (strategy == JsonbContainsStrategyNumber)
1189 : {
1190 : /* Query is a jsonb, so just apply gin_extract_jsonb_path ... */
1191 84 : entries = (Datum *)
1192 84 : DatumGetPointer(DirectFunctionCall2(gin_extract_jsonb_path,
1193 : PG_GETARG_DATUM(0),
1194 : PointerGetDatum(nentries)));
1195 :
1196 : /* ... although "contains {}" requires a full index scan */
1197 84 : if (*nentries == 0)
1198 8 : *searchMode = GIN_SEARCH_MODE_ALL;
1199 : }
1200 196 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
1201 : strategy == JsonbJsonpathExistsStrategyNumber)
1202 196 : {
1203 196 : JsonPath *jp = PG_GETARG_JSONPATH_P(0);
1204 196 : Pointer **extra_data = (Pointer **) PG_GETARG_POINTER(4);
1205 :
1206 196 : entries = extract_jsp_query(jp, strategy, true, nentries, extra_data);
1207 :
1208 196 : if (!entries)
1209 32 : *searchMode = GIN_SEARCH_MODE_ALL;
1210 : }
1211 : else
1212 : {
1213 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
1214 : entries = NULL;
1215 : }
1216 :
1217 280 : PG_RETURN_POINTER(entries);
1218 : }
1219 :
1220 : Datum
1221 0 : gin_consistent_jsonb_path(PG_FUNCTION_ARGS)
1222 : {
1223 0 : bool *check = (bool *) PG_GETARG_POINTER(0);
1224 0 : StrategyNumber strategy = PG_GETARG_UINT16(1);
1225 :
1226 : /* Jsonb *query = PG_GETARG_JSONB_P(2); */
1227 0 : int32 nkeys = PG_GETARG_INT32(3);
1228 0 : Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
1229 0 : bool *recheck = (bool *) PG_GETARG_POINTER(5);
1230 0 : bool res = true;
1231 : int32 i;
1232 :
1233 0 : if (strategy == JsonbContainsStrategyNumber)
1234 : {
1235 : /*
1236 : * jsonb_path_ops is necessarily lossy, not only because of hash
1237 : * collisions but also because it doesn't preserve complete
1238 : * information about the structure of the JSON object. Besides, there
1239 : * are some special rules around the containment of raw scalars in
1240 : * arrays that are not handled here. So we must always recheck a
1241 : * match. However, if not all of the keys are present, the tuple
1242 : * certainly doesn't match.
1243 : */
1244 0 : *recheck = true;
1245 0 : for (i = 0; i < nkeys; i++)
1246 : {
1247 0 : if (!check[i])
1248 : {
1249 0 : res = false;
1250 0 : break;
1251 : }
1252 : }
1253 : }
1254 0 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
1255 : strategy == JsonbJsonpathExistsStrategyNumber)
1256 : {
1257 0 : *recheck = true;
1258 :
1259 0 : if (nkeys > 0)
1260 : {
1261 : Assert(extra_data && extra_data[0]);
1262 0 : res = execute_jsp_gin_node((JsonPathGinNode *) extra_data[0], check,
1263 : false) != GIN_FALSE;
1264 : }
1265 : }
1266 : else
1267 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
1268 :
1269 0 : PG_RETURN_BOOL(res);
1270 : }
1271 :
1272 : Datum
1273 20792 : gin_triconsistent_jsonb_path(PG_FUNCTION_ARGS)
1274 : {
1275 20792 : GinTernaryValue *check = (GinTernaryValue *) PG_GETARG_POINTER(0);
1276 20792 : StrategyNumber strategy = PG_GETARG_UINT16(1);
1277 :
1278 : /* Jsonb *query = PG_GETARG_JSONB_P(2); */
1279 20792 : int32 nkeys = PG_GETARG_INT32(3);
1280 20792 : Pointer *extra_data = (Pointer *) PG_GETARG_POINTER(4);
1281 20792 : GinTernaryValue res = GIN_MAYBE;
1282 : int32 i;
1283 :
1284 20792 : if (strategy == JsonbContainsStrategyNumber)
1285 : {
1286 : /*
1287 : * Note that we never return GIN_TRUE, only GIN_MAYBE or GIN_FALSE;
1288 : * this corresponds to always forcing recheck in the regular
1289 : * consistent function, for the reasons listed there.
1290 : */
1291 4372 : for (i = 0; i < nkeys; i++)
1292 : {
1293 220 : if (check[i] == GIN_FALSE)
1294 : {
1295 56 : res = GIN_FALSE;
1296 56 : break;
1297 : }
1298 : }
1299 : }
1300 16584 : else if (strategy == JsonbJsonpathPredicateStrategyNumber ||
1301 : strategy == JsonbJsonpathExistsStrategyNumber)
1302 : {
1303 16976 : if (nkeys > 0)
1304 : {
1305 : Assert(extra_data && extra_data[0]);
1306 392 : res = execute_jsp_gin_node((JsonPathGinNode *) extra_data[0], check,
1307 : true);
1308 :
1309 : /* Should always recheck the result */
1310 392 : if (res == GIN_TRUE)
1311 280 : res = GIN_MAYBE;
1312 : }
1313 : }
1314 : else
1315 0 : elog(ERROR, "unrecognized strategy number: %d", strategy);
1316 :
1317 20792 : PG_RETURN_GIN_TERNARY_VALUE(res);
1318 : }
1319 :
1320 : /*
1321 : * Construct a jsonb_ops GIN key from a flag byte and a textual representation
1322 : * (which need not be null-terminated). This function is responsible
1323 : * for hashing overlength text representations; it will add the
1324 : * JGINFLAG_HASHED bit to the flag value if it does that.
1325 : */
1326 : static Datum
1327 39136 : make_text_key(char flag, const char *str, int len)
1328 : {
1329 : text *item;
1330 : char hashbuf[10];
1331 :
1332 39136 : if (len > JGIN_MAXLENGTH)
1333 : {
1334 : uint32 hashval;
1335 :
1336 0 : hashval = DatumGetUInt32(hash_any((const unsigned char *) str, len));
1337 0 : snprintf(hashbuf, sizeof(hashbuf), "%08x", hashval);
1338 0 : str = hashbuf;
1339 0 : len = 8;
1340 0 : flag |= JGINFLAG_HASHED;
1341 : }
1342 :
1343 : /*
1344 : * Now build the text Datum. For simplicity we build a 4-byte-header
1345 : * varlena text Datum here, but we expect it will get converted to short
1346 : * header format when stored in the index.
1347 : */
1348 39136 : item = (text *) palloc(VARHDRSZ + len + 1);
1349 39136 : SET_VARSIZE(item, VARHDRSZ + len + 1);
1350 :
1351 39136 : *VARDATA(item) = flag;
1352 :
1353 39136 : memcpy(VARDATA(item) + 1, str, len);
1354 :
1355 39136 : return PointerGetDatum(item);
1356 : }
1357 :
1358 : /*
1359 : * Create a textual representation of a JsonbValue that will serve as a GIN
1360 : * key in a jsonb_ops index. is_key is true if the JsonbValue is a key,
1361 : * or if it is a string array element (since we pretend those are keys,
1362 : * see jsonb.h).
1363 : */
1364 : static Datum
1365 38824 : make_scalar_key(const JsonbValue *scalarVal, bool is_key)
1366 : {
1367 : Datum item;
1368 : char *cstr;
1369 :
1370 38824 : switch (scalarVal->type)
1371 : {
1372 52 : case jbvNull:
1373 : Assert(!is_key);
1374 52 : item = make_text_key(JGINFLAG_NULL, "", 0);
1375 52 : break;
1376 3712 : case jbvBool:
1377 : Assert(!is_key);
1378 3712 : item = make_text_key(JGINFLAG_BOOL,
1379 3712 : scalarVal->val.boolean ? "t" : "f", 1);
1380 3712 : break;
1381 6644 : case jbvNumeric:
1382 : Assert(!is_key);
1383 :
1384 : /*
1385 : * A normalized textual representation, free of trailing zeroes,
1386 : * is required so that numerically equal values will produce equal
1387 : * strings.
1388 : *
1389 : * It isn't ideal that numerics are stored in a relatively bulky
1390 : * textual format. However, it's a notationally convenient way of
1391 : * storing a "union" type in the GIN B-Tree, and indexing Jsonb
1392 : * strings takes precedence.
1393 : */
1394 6644 : cstr = numeric_normalize(scalarVal->val.numeric);
1395 6644 : item = make_text_key(JGINFLAG_NUM, cstr, strlen(cstr));
1396 6644 : pfree(cstr);
1397 6644 : break;
1398 28416 : case jbvString:
1399 28416 : item = make_text_key(is_key ? JGINFLAG_KEY : JGINFLAG_STR,
1400 28416 : scalarVal->val.string.val,
1401 : scalarVal->val.string.len);
1402 28416 : break;
1403 0 : default:
1404 0 : elog(ERROR, "unrecognized jsonb scalar type: %d", scalarVal->type);
1405 : item = 0; /* keep compiler quiet */
1406 : break;
1407 : }
1408 :
1409 38824 : return item;
1410 : }
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