Re: [GENERAL] different results based solely on existence of index (no, seriously)
On Aug 12, 2008, at 3:53 AM, Willy-Bas Loos wrote: reproduced it on: "PostgreSQL 8.3.3 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)" 3 rows with index, 2 rows without. can not reproduce it on: - "PostgreSQL 8.1.10 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.1.3 20070831 (prerelease) (Ubuntu 4.1.2-16ubuntu1)" - "PostgreSQL 8.2.6 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2 (mingw-special)" - "PostgreSQL 8.2.7 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu4)" they allways return 2 rows. hth WBL reproduced on: PostgreSQL 8.3.1 on i386-apple-darwin9.4.0, compiled by GCC i686-apple- darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465) 3rows with index, 2 rows without Ries -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] different results based solely on existence of index (no, seriously)
"Matthew Dennis" <[EMAIL PROTECTED]> writes: > In reference to the script below (I know it can be rewritten, that's not the > point), I get 3 rows if the referenced index exists but only two rows if it > does not. I don't see any failure in 8.3 branch tip. I think the bug was fixed here: http://archives.postgresql.org/pgsql-committers/2008-06/msg00336.php regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] different results based solely on existence of index (no, seriously)
On Mon, Aug 11, 2008 at 10:35:26PM -0500, Matthew Dennis wrote: > In reference to the script below (I know it can be rewritten, that's > not the point), I get 3 rows if the referenced index exists but only > two rows if it does not. This is observable and repeatable just by > dropping/creating the index. Drop the index and two rows are > returned. Create the index, three rows are returned. Drop the > index, two rows again. In addition, in no case does the selected > column t2.c2 actually contain a value (it's always null). Since in > the 3 row case, it returns a row with t1.c1=2, I would have expected > a value from t2 (if you add t2.c1 to select clause you can see that > is null as well). > > It's probably worth mentioning (since it actually took me a while to > notice) that the plans are subtlety different. Neither plan (with > or without index existing) actually uses the index, but in one case > there is an extra filter node. > > version string is PostgreSQL 8.3.1 on i686-redhat-linux-gnu, > compiled by GCC gcc (GCC) 4.1.2 20070925 (Red Hat 4.1.2-33) I have reproduced it on 8.3.3. Just FYI, a bug isn't a bug unless you can reproduce it on the latest minor version, in this case 8.3.3, of the major version, in this case 8.3, that the bug appears in. Cheers, David. -- David Fetter <[EMAIL PROTECTED]> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: [EMAIL PROTECTED] Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] different results based solely on existence of index (no, seriously)
On Aug 12, 2008, at 3:53 AM, Willy-Bas Loos wrote: reproduced it on: "PostgreSQL 8.3.3 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)" 3 rows with index, 2 rows without. can not reproduce it on: - "PostgreSQL 8.1.10 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.1.3 20070831 (prerelease) (Ubuntu 4.1.2-16ubuntu1)" - "PostgreSQL 8.2.6 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2 (mingw-special)" - "PostgreSQL 8.2.7 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu4)" they allways return 2 rows. hth WBL reproduced on: PostgreSQL 8.3.1 on i386-apple-darwin9.4.0, compiled by GCC i686-apple- darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5465) 3rows with index, 2 rows without Ries -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] different results based solely on existence of index (no, seriously)
reproduced it on: "PostgreSQL 8.3.3 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7)" 3 rows with index, 2 rows without. can not reproduce it on: - "PostgreSQL 8.1.10 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.1.3 20070831 (prerelease) (Ubuntu 4.1.2-16ubuntu1)" - "PostgreSQL 8.2.6 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2 (mingw-special)" - "PostgreSQL 8.2.7 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu4)" they allways return 2 rows. hth WBL
