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Only allow returning string types or bytea from json_serialize

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These are documented to be the allowed types for the RETURNING clause,
but the restriction was not being enforced, which caused a segfault if
another type was specified. Add some testing for this.

Per report from a.kozhemyakin

Backpatch to release 15.
This commit is contained in:
Andrew Dunstan
2022-07-07 17:40:02 -04:00
parent 8821054210
commit 3c633f32b9
3 changed files with 32 additions and 0 deletions
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5
src/test/regress/sql/sqljson.sql
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@ -60,8 +60,13 @@ SELECT JSON_SERIALIZE('{ "a" : 1 } ');
SELECT JSON_SERIALIZE('1');
SELECT JSON_SERIALIZE('1' FORMAT JSON);
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING bytea);
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING varchar);
SELECT pg_typeof(JSON_SERIALIZE(NULL));
-- only string types or bytea allowed
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING jsonb);
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SERIALIZE('{}');
EXPLAIN (VERBOSE, COSTS OFF) SELECT JSON_SERIALIZE('{}' RETURNING bytea);