Re: BUG #5478: ILIKE operator returns wrong result

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Markus <markus(dot)herven(at)outpost24(dot)com>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #5478: ILIKE operator returns wrong result
Date: 2010-05-28 14:55:26
Message-ID: 201005281455.o4SEtQf18738@momjian.us
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Tom Lane wrote:
> "Markus" <markus(dot)herven(at)outpost24(dot)com> writes:
> > select 'ba' ilike '%__%';
> > return true as expected in 8.2 but false in 8.4.
>
> I have a feeling that this represents still another bug in the
> special-case path for % followed by _ (cf bug #4821). If so,
> maybe we ought to just toss out that optimization?

Yea, looks like it is this code in like_match.c:

/* %_ is the same as _% - avoid matching _ repeatedly */

do
{
NextChar(t, tlen);
NextByte(p, plen);
} while (tlen > 0 && plen > 0 && *p == '_');

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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