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SQL/JSON: support the IS JSON predicate

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This patch introduces the SQL standard IS JSON predicate. It operates
on text and bytea values representing JSON, as well as on the json and
jsonb types. Each test has IS and IS NOT variants and supports a WITH
UNIQUE KEYS flag. The tests are:

IS JSON [VALUE]
IS JSON ARRAY
IS JSON OBJECT
IS JSON SCALAR

These should be self-explanatory.

The WITH UNIQUE KEYS flag makes these return false when duplicate keys
exist in any object within the value, not necessarily directly contained
in the outermost object.

Author: Nikita Glukhov <n.gluhov@postgrespro.ru>
Author: Teodor Sigaev <teodor@sigaev.ru>
Author: Oleg Bartunov <obartunov@gmail.com>
Author: Alexander Korotkov <aekorotkov@gmail.com>
Author: Amit Langote <amitlangote09@gmail.com>
Author: Andrew Dunstan <andrew@dunslane.net>

Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu,
Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby.

Discussion: https://postgr.es/m/CAF4Au4w2x-5LTnN_bxky-mq4=WOqsGsxSpENCzHRAzSnEd8+WQ@mail.gmail.com
Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
Discussion: https://postgr.es/m/20220616233130.rparivafipt6doj3@alap3.anarazel.de
Discussion: https://postgr.es/m/abd9b83b-aa66-f230-3d6d-734817f0995d%40postgresql.org
This commit is contained in:
Alvaro Herrera
2023-03-31 22:34:04 +02:00
parent a2a0c7c29e
commit 6ee30209a6
25 changed files with 1031 additions and 68 deletions
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3
src/include/nodes/makefuncs.h
View File

@@ -112,6 +112,9 @@ extern JsonFormat *makeJsonFormat(JsonFormatType type, JsonEncoding encoding,
int location);
extern JsonValueExpr *makeJsonValueExpr(Expr *expr, JsonFormat *format);
extern Node *makeJsonKeyValue(Node *key, Node *value);
extern Node *makeJsonIsPredicate(Node *expr, JsonFormat *format,
JsonValueType item_type, bool unique_keys,
int location);
extern JsonEncoding makeJsonEncoding(char *name);
#endif /* MAKEFUNC_H */

26
src/include/nodes/primnodes.h
View File

@@ -1583,6 +1583,32 @@ typedef struct JsonConstructorExpr
int location;
} JsonConstructorExpr;
/*
* JsonValueType -
* representation of JSON item type in IS JSON predicate
*/
typedef enum JsonValueType
{
JS_TYPE_ANY, /* IS JSON [VALUE] */
JS_TYPE_OBJECT, /* IS JSON OBJECT */
JS_TYPE_ARRAY, /* IS JSON ARRAY */
JS_TYPE_SCALAR /* IS JSON SCALAR */
} JsonValueType;
/*
* JsonIsPredicate -
* representation of IS JSON predicate
*/
typedef struct JsonIsPredicate
{
NodeTag type;
Node *expr; /* subject expression */
JsonFormat *format; /* FORMAT clause, if specified */
JsonValueType item_type; /* JSON item type */
bool unique_keys; /* check key uniqueness? */
int location; /* token location, or -1 if unknown */
} JsonIsPredicate;
/* ----------------
* NullTest
*