Re: A Guide to Constraint Exclusion (Partitioning)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>,bizgres-general(at)pgfoundry(dot)org, pgsql-hackers(at)postgresql(dot)org
Subject: Re: A Guide to Constraint Exclusion (Partitioning)
Date: 2005-07-23 21:13:01
Message-ID: 5068.1122153181@sss.pgh.pa.us
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Greg Stark <gsstark(at)mit(dot)edu> writes:
> That was the detail I was missing. I'm surprised because I actually tested
> this before I sent the message and saw a plan like this with a single
> sequential scan node despite the three child tables:

> staging=> explain select * from _test where a=1;
> QUERY PLAN
> ------------------------------------------------------
> Seq Scan on _test (cost=0.00..22.50 rows=5 width=4)
> Filter: (a = 1)
> (2 rows)

Uh, maybe you have sql_inheritance turned off? Every version I can
remember would show you a pretty explicit Append plan for inheritance
scans...

regards, tom lane

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