SQLite

The following query works and gives the correct answer for SQLite version 3.8.10 but fails to compile with a "misuse of aggregate" error for 3.8.11.

CREATE TABLE t1(a int, b int);
INSERT INTO t1 VALUES(1,2),(1,18),(2,19);
SELECT x, y FROM (
  SELECT a AS x, sum(b) AS y FROM t1 GROUP BY a
  UNION
  SELECT 98, 99
) AS w WHERE y>=20;

The problem seems to have been introduced by check-in [6df18e949d36] on 2015-06-02. The problem was reported on the sqlite-users mailing list by Jean-Luc Hainaut.