Re: pg_trgm indexes giving bad estimations?

From: Tom Lane
Subject: Re: pg_trgm indexes giving bad estimations?
Date: ,
Msg-id: 13752.1162360877@sss.pgh.pa.us
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In response to: Re: pg_trgm indexes giving bad estimations?  (Ben)
List: pgsql-performance

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pg_trgm indexes giving bad estimations?  (Ben, )
 Re: pg_trgm indexes giving bad estimations?  (Tom Lane, )
  Re: pg_trgm indexes giving bad estimations?  (Ben, )
   Re: pg_trgm indexes giving bad estimations?  (Tom Lane, )

Ben <> writes:
> Unfortunately, it's not at all clear to me from reading
> http://www.postgresql.org/docs/8.1/interactive/xoper-optimization.html#AEN33077
> how like impliments selectivity. Any pointers on where to look?

likesel() and subsidiary functions in src/backend/utils/adt/selfuncs.c

            regards, tom lane


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