On Fri, Jun 28, 2013 at 7:21 AM, E.Pasma <pasm...@concepts.nl> wrote:
> > I tested the draft version ... > Thanks for the test report! > Unfortunately I also found a bug. For some reason the optimizer may ignore > a where clause on an outerjoined table. The example below shows this, as > far as it appears in the execution plan. In my test there was also a > difference in the number of returned rows. > > $ sqlite3 > SQLite version 3.8.0 2013-06-26 13:22:28 > Enter ".help" for instructions > Enter SQL statements terminated with a ";" > sqlite> .read ttt130627.sql > create table t (t integer primary key, x, y); > create table t0 (t0 integer primary key, t, z); > explain query plan > select z from t0 left outer join t using (t) where t.t is null; > 0|0|0|SCAN TABLE t0 > > There is a new optimization (only tangentially related to NGQP) that attempts to remove tables from a join if the presence of those tables cannot effect the output. I think this issue is that optimization being overzealous. We will investigate. Thanks. -- D. Richard Hipp d...@sqlite.org _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
