| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, greg(at)turnstep(dot)com |
| Subject: | Re: Fix for cube picksplit function |
| Date: | 2010-11-15 02:34:23 |
| Message-ID: | AANLkTikroS6akLbKQNrqiU9eEz7etCFhH=3yJ5zovqg3@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Oct 29, 2010 at 2:59 PM, Alexander Korotkov
<aekorotkov(at)gmail(dot)com> wrote:
> Gist picksplit method implementation in cube contrib module contains a bug
> in Guttman's split algorithm implementation. It was mentioned before but it
> is still not fixed yet. Current implementation doesn't cause incorrect
> behavior, but index becomes very bad, because each index scan require to
> read significant part of index.
It looks to me like this can be safely back-patched, because it
doesn't affect the contents of index entries already on disk, just the
manner in which we construct new ones.
So I've committed this and back-patched it all the way back to 8.1.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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