| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
| Cc: | pgsql-hackers(at)postgresql(dot)org, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: LIKE optimization in UTF-8 and locale-C |
| Date: | 2007-03-22 15:08:08 |
| Message-ID: | 3049.1174576088@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> writes:
> I found LIKE operators are slower on multi-byte encoding databases
> than single-byte encoding ones. It comes from difference between
> MatchText() and MBMatchText().
> We've had an optimization for single-byte encodings using
> pg_database_encoding_max_length() == 1 test. I'll propose to extend it
> in UTF-8 with locale-C case.
If this works for UTF8, won't it work for all the backend-legal
encodings?
regards, tom lane
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