text: -- where.test
  -- 
  -- execsql {
  --     CREATE TEMP TABLE t1 (a, b, c, d, e);
  --     CREATE TEMP TABLE t2 (f);
  --     SELECT t1.e AS alias FROM t2, t1 WHERE alias = 1 ;
  -- }
  CREATE TEMP TABLE t1 (a, b, c, d, e);
  CREATE TEMP TABLE t2 (f);
  SELECT t1.e AS alias FROM t2, t1 WHERE alias = 1 ;