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| author | Amit Langote <amitlan@postgresql.org> | 2024-03-21 17:06:27 +0900 |
|---|---|---|
| committer | Amit Langote <amitlan@postgresql.org> | 2024-03-21 17:07:03 +0900 |
| commit | 6185c9737cf48c9540782d88f12bd2912d6ca1cc (patch) | |
| tree | 60b88a5d63fc61a1dbb11c5459ad83273f93db77 /src/include/executor/execExpr.h | |
| parent | a145f424d5248a09d766e8cb503b999290cb3b31 (diff) | |
| download | postgresql-6185c9737cf48c9540782d88f12bd2912d6ca1cc.tar.gz postgresql-6185c9737cf48c9540782d88f12bd2912d6ca1cc.zip | |
Add SQL/JSON query functions
This introduces the following SQL/JSON functions for querying JSON
data using jsonpath expressions:
JSON_EXISTS(), which can be used to apply a jsonpath expression to a
JSON value to check if it yields any values.
JSON_QUERY(), which can be used to to apply a jsonpath expression to
a JSON value to get a JSON object, an array, or a string. There are
various options to control whether multi-value result uses array
wrappers and whether the singleton scalar strings are quoted or not.
JSON_VALUE(), which can be used to apply a jsonpath expression to a
JSON value to return a single scalar value, producing an error if it
multiple values are matched.
Both JSON_VALUE() and JSON_QUERY() functions have options for
handling EMPTY and ERROR conditions, which can be used to specify
the behavior when no values are matched and when an error occurs
during jsonpath evaluation, respectively.
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: Andrew Dunstan <andrew@dunslane.net>
Author: Amit Langote <amitlangote09@gmail.com>
Author: Peter Eisentraut <peter@eisentraut.org>
Author: Jian He <jian.universality@gmail.com>
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, Álvaro Herrera, Jian He, Anton A. Melnikov,
Nikita Malakhov, Peter Eisentraut, Tomas Vondra
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
Discussion: https://postgr.es/m/CA+HiwqHROpf9e644D8BRqYvaAPmgBZVup-xKMDPk-nd4EpgzHw@mail.gmail.com
Discussion: https://postgr.es/m/CA+HiwqE4XTdfb1nW=Ojoy_tQSRhYt-q_kb6i5d4xcKyrLC1Nbg@mail.gmail.com
Diffstat (limited to 'src/include/executor/execExpr.h')
| -rw-r--r-- | src/include/executor/execExpr.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h index 8953d767387..64698202a56 100644 --- a/src/include/executor/execExpr.h +++ b/src/include/executor/execExpr.h @@ -240,6 +240,9 @@ typedef enum ExprEvalOp EEOP_XMLEXPR, EEOP_JSON_CONSTRUCTOR, EEOP_IS_JSON, + EEOP_JSONEXPR_PATH, + EEOP_JSONEXPR_COERCION, + EEOP_JSONEXPR_COERCION_FINISH, EEOP_AGGREF, EEOP_GROUPING_FUNC, EEOP_WINDOW_FUNC, @@ -693,6 +696,20 @@ typedef struct ExprEvalStep JsonIsPredicate *pred; /* original expression node */ } is_json; + /* for EEOP_JSONEXPR_PATH */ + struct + { + struct JsonExprState *jsestate; + } jsonexpr; + + /* for EEOP_JSONEXPR_COERCION */ + struct + { + Oid targettype; + int32 targettypmod; + void *json_populate_type_cache; + ErrorSaveContext *escontext; + } jsonexpr_coercion; } d; } ExprEvalStep; @@ -810,6 +827,11 @@ extern void ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op); extern void ExecEvalJsonConstructor(ExprState *state, ExprEvalStep *op, ExprContext *econtext); extern void ExecEvalJsonIsPredicate(ExprState *state, ExprEvalStep *op); +extern int ExecEvalJsonExprPath(ExprState *state, ExprEvalStep *op, + ExprContext *econtext); +extern void ExecEvalJsonCoercion(ExprState *state, ExprEvalStep *op, + ExprContext *econtext); +extern void ExecEvalJsonCoercionFinish(ExprState *state, ExprEvalStep *op); extern void ExecEvalGroupingFunc(ExprState *state, ExprEvalStep *op); extern void ExecEvalMergeSupportFunc(ExprState *state, ExprEvalStep *op, ExprContext *econtext); |