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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
32 lines
1.0 KiB
C
32 lines
1.0 KiB
C
/*-------------------------------------------------------------------------
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*
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* json.h
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* Declarations for JSON data type support.
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/json.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef JSON_H
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#define JSON_H
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#include "lib/stringinfo.h"
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/* functions in json.c */
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extern void escape_json(StringInfo buf, const char *str);
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extern char *JsonEncodeDateTime(char *buf, Datum value, Oid typid,
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const int *tzp);
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extern bool to_json_is_immutable(Oid typoid);
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extern Datum json_build_object_worker(int nargs, Datum *args, bool *nulls,
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Oid *types, bool absent_on_null,
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bool unique_keys);
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extern Datum json_build_array_worker(int nargs, Datum *args, bool *nulls,
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Oid *types, bool absent_on_null);
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extern bool json_validate(text *json, bool check_unique_keys, bool throw_error);
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#endif /* JSON_H */
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