SQLite

The LIMIT on the final SELECT in the following code does not work:

CREATE TABLE t1(x);
INSERT INTO t1 VALUES(5);
CREATE VIEW v1 AS SELECT x*2 FROM t1;
CREATE VIEW v2 AS SELECT * FROM v1 UNION ALL SELECT * FROM v1;
CREATE VIEW v4 AS SELECT * FROM v2 UNION ALL SELECT * FROM v2;
SELECT * FROM v4 LIMIT 3;

The problem seems to have been introduced by check-ins [3ef468e7046b209] or [a79786a961dba8] on 2008-07-01. The problem first appeared in version 3.6.1. The problem was detected during internal testing and has never been seen in the wild.

A related problem: The following SQL leaks memory - lookaside memory in particular which will result in an assert() fault when run with SQLITE_DEBUG.

CREATE TABLE t1(x);
INSERT INTO t1 VALUES(1),(2);
SELECT z FROM (
    SELECT y AS z FROM (SELECT x AS y FROM t1)
    UNION ALL
    SELECT y+10 FROM (SELECT x AS y FROM t1)
)
LIMIT 3 OFFSET 2;