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match_special_index_operator don't work in 7.2.1

From: Andriy I Pilipenko <bamby(at)marka(dot)net(dot)ua>
To: pgsql-bugs(at)postgresql(dot)org
Subject: match_special_index_operator don't work in 7.2.1
Date: 2002-05-19 10:30:17
Message-ID: 20020519132049.L2323-100000@bamby.marka.net.ua (view raw or flat)
Thread:
Lists: pgsql-bugs
Your name		:	Andriy I Pilipenko
Your email address	:	bamby(at)marka(dot)net(dot)ua


System Configuration
---------------------
  Architecture  	: Intel Pentium

  Operating System 	: FreeBSD 4.5-STABLE

  PostgreSQL version 	: PostgreSQL-7.2.1

  Compiler used 	: gcc 2.95.3



Please enter a FULL description of your problem:
------------------------------------------------

I've upgraded from 7.0.3 to 7.2.1 and noticed that queries like

SELECT ... WHERE field LIKE 'something%'

take too much time to execute now.



Please describe a way to repeat the problem.   Please try to provide a
concise reproducible example, if at all possible:
----------------------------------------------------------------------

bamby=# create table t (f varchar(100));
CREATE
bamby=# create index i_t__f on t(f);
CREATE
bamby=# SET enable_seqscan TO 'off';
SET VARIABLE
bamby=# EXPLAIN SELECT * from t where f = 'aa';
NOTICE:  QUERY PLAN:

Index Scan using i_t__f on t  (cost=0.00..17.07 rows=5 width=68)

EXPLAIN
bamby=# EXPLAIN SELECT * from t where f LIKE 'aa%';
NOTICE:  QUERY PLAN:

Seq Scan on t  (cost=100000000.00..100000022.50 rows=5 width=68)

EXPLAIN



If you know how this problem might be fixed, list the solution below:
---------------------------------------------------------------------


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Next:From: Stephan SzaboDate: 2002-05-19 11:07:09
Subject: Re: match_special_index_operator don't work in 7.2.1
Previous:From: Enke, MichaelDate: 2002-05-17 09:55:42
Subject: Re: [HACKERS] Bug #659: lower()/upper() bug on

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