Re: queries with lots of UNIONed relations

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Jon Nelson <jnelson+pgsql(at)jamponi(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-performance(at)postgresql(dot)org
Subject: Re: queries with lots of UNIONed relations
Date: 2011-01-13 21:44:30
Message-ID: AANLkTikYEX25b4E_AoZk=WWspv2OC7ZKct2VeZb1NCMj@mail.gmail.com
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On Thu, Jan 13, 2011 at 3:12 PM, Jon Nelson <jnelson+pgsql(at)jamponi(dot)net> wrote:
> I still think that having UNION do de-duplication of each contributory
> relation is a beneficial thing to consider -- especially if postgresql
> thinks the uniqueness is not very high.

This might be worth a TODO.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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