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| author | Alvaro Herrera | 2023-03-31 20:34:04 +0000 |
|---|---|---|
| committer | Alvaro Herrera | 2023-03-31 20:34:04 +0000 |
| commit | 6ee30209a6f161d0a267a33f090c70c579c87c00 (patch) | |
| tree | eda2b3a9f0a61f3fc484819b39abf1eb130e0d88 /src/backend/utils/adt/jsonfuncs.c | |
| parent | a2a0c7c29e47f39da905577659e66b0086b769cc (diff) | |
SQL/JSON: support the IS JSON predicate
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 <[email protected]>
Author: Teodor Sigaev <[email protected]>
Author: Oleg Bartunov <[email protected]>
Author: Alexander Korotkov <[email protected]>
Author: Amit Langote <[email protected]>
Author: Andrew Dunstan <[email protected]>
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/[email protected]
Discussion: https://postgr.es/m/[email protected]
Discussion: https://postgr.es/m/abd9b83b-aa66-f230-3d6d-734817f0995d%40postgresql.org
Diffstat (limited to 'src/backend/utils/adt/jsonfuncs.c')
| -rw-r--r-- | src/backend/utils/adt/jsonfuncs.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/backend/utils/adt/jsonfuncs.c b/src/backend/utils/adt/jsonfuncs.c index 7a36f74dad4..4c5abaff257 100644 --- a/src/backend/utils/adt/jsonfuncs.c +++ b/src/backend/utils/adt/jsonfuncs.c @@ -5665,3 +5665,23 @@ transform_string_values_scalar(void *state, char *token, JsonTokenType tokentype return JSON_SUCCESS; } + +JsonTokenType +json_get_first_token(text *json, bool throw_error) +{ + JsonLexContext *lex; + JsonParseErrorType result; + + lex = makeJsonLexContext(json, false); + + /* Lex exactly one token from the input and check its type. */ + result = json_lex(lex); + + if (result == JSON_SUCCESS) + return lex->token_type; + + if (throw_error) + json_errsave_error(result, lex, NULL); + + return JSON_TOKEN_INVALID; /* invalid json */ +} |