From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
Cc: | Jan Urbański <wulczer(at)wulczer(dot)org>, Postgres - Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: wildcard search support for pg_trgm |
Date: | 2011-02-01 02:40:32 |
Message-ID: | 14415.1296528032@sss.pgh.pa.us |
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=?UTF-8?B?SmFuIFVyYmHFhHNraQ==?= <wulczer(at)wulczer(dot)org> writes:
> OK, now it works flawlessly as far as I can tell. Will mark it as Ready
> for Committer.
Applied with mostly-stylistic corrections, plus addition of
documentation and a minimal regression test.
I did *not* apply this bit:
>> 2) I found gist index not very useful with default SIGLENINT = 3. I've
>> changed this value to 15 and I found gist index performs very good on
>> dictionary. But on longer strings greater values of SIGLENINT may be
>> required (probably even SIGLENINT > 122 will give benefit in some cases in
>> spite of TOAST).
AFAICT that would break on-disk compatibility of pg_trgm GIST indexes.
I don't believe we have adequate evidence to justify doing that, and
in any case it ought to be a separate patch rather than buried inside a
mostly unrelated feature patch.
regards, tom lane
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