From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: like/ilike improvements |
Date: | 2007-05-22 16:12:51 |
Message-ID: | 14164.1179850371@sss.pgh.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> ... It turns out (according to the analysis) that the
> only time we actually need to use NextChar is when we are matching an
> "_" in a like/ilike pattern.
I thought we'd determined that advancing bytewise for "%" was also risky,
in two cases:
1. Multibyte character set that is not UTF8 (more specifically, does not
have a guarantee that first bytes and not-first bytes are distinct)
2. "_" immediately follows the "%".
regards, tom lane
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