| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Ron Peterson <ron(dot)peterson(at)yellowbank(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: programming 'like' operator |
| Date: | 2007-01-30 02:39:18 |
| Message-ID: | 23209.1170124758@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Ron Peterson <ron(dot)peterson(at)yellowbank(dot)com> writes:
> Anyone have any tips for an earnest aspiring but somewhat befuddled
> PostgreSQL acolyte as to what's required to program (in C) a 'like'
> operator for a user defined type?
Well, you could look at the existing code which is in
src/backend/utils/adt/like.c
src/backend/utils/adt/like_match.c
The text variant is a bit obfuscated because it tries to support
both case-sensitive and case-insensitive matching with only one
set of code --- the bytea variant might be easier to follow.
regards, tom lane
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