From 17872d6d2a7442c5182e58edb1faa68fd38e2895 Mon Sep 17 00:00:00 2001
From: Shihao <zhong950419@gmail.com>
Date: Fri, 18 Sep 2026 23:15:03 -0400
Subject: [PATCH v1 2/2] Add tests for JSON_SERIALIZE() with a jsonb argument

Cover the default RETURNING type, bytea, a varchar that is too short,
and a NULL input.
---
 src/test/regress/expected/sqljson.out | 21 +++++++++++++++++++++
 src/test/regress/sql/sqljson.sql      |  6 ++++++
 2 files changed, 27 insertions(+)

diff --git a/src/test/regress/expected/sqljson.out b/src/test/regress/expected/sqljson.out
index 30f9e10ef0a..12353d68686 100644
--- a/src/test/regress/expected/sqljson.out
+++ b/src/test/regress/expected/sqljson.out
@@ -270,6 +270,27 @@ SELECT pg_typeof(JSON_SERIALIZE(NULL));
  text
 (1 row)
 
+-- jsonb input
+SELECT JSON_SERIALIZE('{"b": [1, 2], "a": "x"}'::jsonb);
+     json_serialize      
+-------------------------
+ {"a": "x", "b": [1, 2]}
+(1 row)
+
+SELECT JSON_SERIALIZE('[1, 2, 4]'::jsonb RETURNING bytea);
+    json_serialize    
+----------------------
+ \x5b312c20322c20345d
+(1 row)
+
+SELECT JSON_SERIALIZE('[1, 2, 4]'::jsonb RETURNING varchar(3));
+ERROR:  value too long for type character varying(3)
+SELECT JSON_SERIALIZE(NULL::jsonb);
+ json_serialize 
+----------------
+ 
+(1 row)
+
 -- only string types or bytea allowed
 SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING jsonb);
 ERROR:  cannot use type jsonb in RETURNING clause of JSON_SERIALIZE()
diff --git a/src/test/regress/sql/sqljson.sql b/src/test/regress/sql/sqljson.sql
index 9fa203ccb53..43ef31b7e8b 100644
--- a/src/test/regress/sql/sqljson.sql
+++ b/src/test/regress/sql/sqljson.sql
@@ -55,6 +55,12 @@ SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING bytea);
 SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING varchar);
 SELECT pg_typeof(JSON_SERIALIZE(NULL));
 
+-- jsonb input
+SELECT JSON_SERIALIZE('{"b": [1, 2], "a": "x"}'::jsonb);
+SELECT JSON_SERIALIZE('[1, 2, 4]'::jsonb RETURNING bytea);
+SELECT JSON_SERIALIZE('[1, 2, 4]'::jsonb RETURNING varchar(3));
+SELECT JSON_SERIALIZE(NULL::jsonb);
+
 -- only string types or bytea allowed
 SELECT JSON_SERIALIZE('{ "a" : 1 } ' RETURNING jsonb);
 
-- 
2.37.1 (Apple Git-137.1)