| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, Teodor Sigaev <teodor(at)sigaev(dot)ru> |
| Subject: | Re: Fixing GIN for empty/null/full-scan cases |
| Date: | 2011-01-04 21:37:46 |
| Message-ID: | AANLkTimSzna-1tkQkWoBJUegkG4xNP3QvLR3vKtyNBA3@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jan 4, 2011 at 4:09 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> * Existing GIN indexes are upwards compatible so far as on-disk storage
> goes, but they will of course be missing entries for empty, null, or
> null-containing items. Users who want to do searches that should find
> such items will need to reindex after updating to 9.1.
This is the only part of this proposal that bothers me a little bit.
It would be nice if the system could determine whether a GIN index is
"upgraded from 9.0 or earlier and thus doesn't contain these entries"
- and avoid trying to use the index for these sorts of queries in
cases where it might return wrong answers.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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