From: andrew@pillette.com
To: Tilmann Singer <tils-pgsql@tils.net>
Cc: andrew@pillette.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Slow query with backwards index scan
Date: Sat, 28 Jul 2007 13:43:58 -0700
Message-ID: <200707282043.l6SKhwP08503@pillette.com> (raw)
As other posters have pointed out, you can overcome the ORDER BY/LIMIT restriction on UNIONs with parentheses. I think I misbalanced the parentheses in my original post, which would have caused an error if you just copied and pasted.
I don't think the limitation has to do with planning--just parsing the query.
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To: pgsql-performance@postgresql.org
Cc: andrew@pillette.com, tils-pgsql@tils.net
Subject: Re: Slow query with backwards index scan
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