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RETURNING clause for JSON() and JSON_SCALAR()

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This patch is extracted from a larger patch that allowed setting the
default returned value from these functions to json or jsonb. That had
problems, but this piece of it is fine. For these functions only json or
jsonb can be specified in the RETURNING clause.

Extracted from an original patch from Nikita Glukhov

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/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
This commit is contained in:
Andrew Dunstan
2022-03-05 08:07:15 -05:00
parent ad43a413c4
commit 49082c2cc3
9 changed files with 135 additions and 16 deletions
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10
src/test/regress/sql/sqljson.sql
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@ -23,6 +23,14 @@ EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123'::bytea FORMAT JSON ENCODING UTF8)
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123' WITH UNIQUE KEYS);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123' WITHOUT UNIQUE KEYS);
SELECT JSON('123' RETURNING text);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123');
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123' RETURNING json);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON('123' RETURNING jsonb);
SELECT pg_typeof(JSON('123'));
SELECT pg_typeof(JSON('123' RETURNING json));
SELECT pg_typeof(JSON('123' RETURNING jsonb));
-- JSON_SCALAR()
SELECT JSON_SCALAR();
@ -41,6 +49,8 @@ SELECT JSON_SCALAR('{}'::jsonb);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SCALAR(123);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SCALAR('123');
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SCALAR(123 RETURNING json);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SCALAR(123 RETURNING jsonb);
-- JSON_SERIALIZE()
SELECT JSON_SERIALIZE();