From: John Lister <john.lister-ps@kickstone.com>
To: pgsql-sql@postgresql.org
Subject: Partitioning by letter question
Date: Fri, 29 Jan 2010 22:24:34 +0000
Message-ID: <4B636022.90804@kickstone.com> (raw)
Hi, I was wondering if this was possible. I'm trying to partition a
table, which is straightforward enough thanks to the great
documentation, but i have a question:
If I partition using something like a product_id for example and have
check constraints such as (id>=1000 and id<2000) then everything is fine
and the planner correctly uses the right subset of the tables. However I
would like to partition by the first letter and using something like
this substr(word,1,1)='a' is ignored by the planner. From reading the
docs I understand that complicated check constraints are ignored, but
this doesn't seem overly complicated.
Am i doing something wrong or is there another better way to do this
Thanks
John
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To: pgsql-sql@postgresql.org
Cc: john.lister-ps@kickstone.com
Subject: Re: Partitioning by letter question
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