SQLite

The following SQL causes a division by zero in the query planner:

ANALYZE;
CREATE TABLE t1(a PRIMARY KEY);
INSERT INTO sqlite_stat1 VALUES('t1',null,'sz=0');
ANALYZE sqlite_master;
SELECT 0 FROM t1 WHERE a IN(1,2,3);

The problem is the sz=0 parameter on the sqlite_stat1 entry for the t1 table. The value of sz needs to be 2 or greater, and this is not enforced. The problem was introduced by check-in [90e36676476e8db0] on 2014-04-30 and first appeared in version 3.8.5.

This problem was reported on the SQLite mailing list by Xingwei Lin.