From: | Joseph Shraibman <jks(at)selectacast(dot)net> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql general list <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: like performance w/o wildcards. |
Date: | 2003-08-04 03:29:21 |
Message-ID: | 3F2DD311.5020100@selectacast.net |
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Lists: | pgsql-general |
Hmm. I didn't work for me. I'll try and figure this out.
Tom Lane wrote:
> Joseph Shraibman <jks(at)selectacast(dot)net> writes:
>
>>I notice in 7.3.3 the planner can't tell when a LIKE has no wildcards
>>and is in reality an '='. Is this an easy change to make?
>
>
> On what do you base that conclusion?
>
> regression=# create table t1 (f1 text unique);
> NOTICE: CREATE TABLE / UNIQUE will create implicit index 't1_f1_key' for table 't1'
> CREATE TABLE
> regression=# explain select * from t1 where f1 like 'foo';
> QUERY PLAN
> ---------------------------------------------------------------------
> Index Scan using t1_f1_key on t1 (cost=0.00..4.82 rows=1 width=32)
> Index Cond: (f1 = 'foo'::text)
> Filter: (f1 ~~ 'foo'::text)
> (3 rows)
>
> regression=#
>
> regards, tom lane
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