SQLite

The first column in the output of the following query contains invalid JSON. The "abc" string value is not quoted. The output is [1,abc] instead of [1,"abc"]

CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1),('abc');
SELECT
   json_group_array(x),
   json_group_array(json_object('x',x))
  FROM t1;

This problem was reported by Marien Zwart on the SQLite Users mailing list.

The underlying problem was that the subtype information for a VDBE register was not being cleared when that register was overwritten and reused, which cause cause the subtype from a prior json_object() call to leak into the parameter of the json_group_array() call. Upgraded the severity to Severe since this problem affects all users of sqlite3_value_subtype() and sqlite3_result_subtype().