From: | Vadim Mikheev <vadim(at)krs(dot)ru> |
---|---|
To: | Andriy I Pilipenko <bamby(at)marka(dot)net(dot)ua> |
Cc: | hackers(at)postgresql(dot)org |
Subject: | Re: [BUGS] General Bug Report: Bug in optimizer |
Date: | 1999-03-18 13:55:22 |
Message-ID: | 36F105CA.5C068E40@krs.ru |
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Lists: | pgsql-bugs pgsql-hackers |
Unprivileged user wrote:
>
> PostgreSQL version : 6.4.2
>
...
>
> Here is an example session. Note that in first SELECT
> backend uses index scan, and in second one it uses
> sequental scan.
>
> == cut ==
> bamby=> create table table1 (field1 int);
> CREATE
> bamby=> create index i_table1__field1 on table1 (field1);
> CREATE
> bamby=> explain select * from table1 where field1 = 1;
> NOTICE: QUERY PLAN:
>
> Index Scan using i_table1__field1 on table1 (cost=0.00 size=0 width=4)
^^^^^^
Hmmm... Seems that vacuum wasn't run for table1.
Why is index used ?!!!
It's bug!
> EXPLAIN
> bamby=> explain select * from table1 where field1 = -1;
> NOTICE: QUERY PLAN:
>
> Seq Scan on table1 (cost=0.00 size=0 width=4)
Run
vacuum table1
Vadim
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