From: | Teodor Sigaev <teodor(at)sigaev(dot)ru> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Eric Davies <eric(at)barrodale(dot)com>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: gist index build produces corrupt result on first access |
Date: | 2004-03-04 13:08:57 |
Message-ID: | 40472A69.1060308@sigaev.ru |
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Lists: | pgsql-general |
Tom Lane wrote:
> Eric Davies <eric(at)barrodale(dot)com> writes:
>
>>We've looked at the contrib/cube code, but it's also a variable length
>>parameter, and it uses a very different parameter passing mechanism.
>
>
> Different how? I have a hard-to-pin-down intuition that your problem is
> closely associated with this issue, but without details it's impossible
> to say more. IIRC there were once assumptions in rtree and/or gist
> about the indexable datatype being pass-by-ref and/or varlena, and I'm
> not sure how much of that has been fixed.
contribs rtree_gist, btree_gist and seg uses pass-by-ref fixed length value for
storage, and there isn't such problem.
It seems to me, the problem may be in union or picksplit methods, but I needs
more info.
I advice to play with gevel module (
http://www.sai.msu.su/~megera/postgres/gist/gevel/README.gevel,
http://www.sai.msu.su/~megera/postgres/gist/gevel/gevel.tar.gz
)
--
Teodor Sigaev E-mail: teodor(at)sigaev(dot)ru
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