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SQL/JSON: Fix coercion of constructor outputs to types with typmod

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Ensure SQL/JSON constructor functions that allow specifying the
target type using the RETURNING clause perform implicit cast to
that type.  This ensures that output values that exceed the specified
length produce an error rather than being  silently truncated. This
behavior conforms to the SQL standard.

Reported-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/202405271326.5a5rprki64aw%40alvherre.pgsql
This commit is contained in:
Amit Langote
2024-06-28 21:37:14 +09:00
parent 065583cf46
commit c2d93c3802
3 changed files with 52 additions and 1 deletions
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12
src/test/regress/sql/sqljson.sql
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@@ -463,3 +463,15 @@ SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT
\sv is_json_view
DROP VIEW is_json_view;
-- Test implicit coercion to a fixed-length type specified in RETURNING
SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING varchar(2));
SELECT JSON_OBJECT('a': JSON_OBJECT('b': 1 RETURNING varchar(2)));
SELECT JSON_ARRAY(JSON_ARRAY('{ "a" : 123 }' RETURNING varchar(2)));
SELECT JSON_ARRAYAGG(('111' || i)::bytea FORMAT JSON NULL ON NULL RETURNING varchar(2)) FROM generate_series(1,1) i;
SELECT JSON_OBJECTAGG(i: ('111' || i)::bytea FORMAT JSON WITH UNIQUE RETURNING varchar(2)) FROM generate_series(1, 1) i;
-- Now try domain over fixed-length type
CREATE DOMAIN sqljson_char2 AS char(2) CHECK (VALUE NOT IN ('12'));
SELECT JSON_SERIALIZE('123' RETURNING sqljson_char2);
SELECT JSON_SERIALIZE('12' RETURNING sqljson_char2);