| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | andrew(at)supernews(dot)com, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: like/ilike improvements |
| Date: | 2007-05-23 14:34:06 |
| Message-ID: | 465450DE.7020609@dunslane.net |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
Tom Lane wrote:
>
> 3. UTF8: % can advance bytewise. _ must check it is on a first byte
> (else return match failure) and if so do NextChar. So primitives
> are NextChar, NextByte, ByteEq, IsFirstByte.
>
>
>
We should only be able to get out of step from the "%_" case, I believe,
so we should only need to do the first-byte test in that case (which is
in a different code path from the normal "_" case. Does that seem right?
cheers
andrew
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