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Re: Join Removal/ Vertical Partitioning

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Simon Riggs <simon(at)2ndquadrant(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Join Removal/ Vertical Partitioning
Date: 2008-06-27 21:50:44
Message-ID: 12000.1214603444@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
>> It might be possible to treat "ignore the RHS" as a join strategy and
>> try to apply it while forming join relations, which would be late enough
>> to have all the needed info available.

> Oh, actually have a join node that is a no-op, with a path cost of zero?

Not even that: just return the best path(s) for the LHS as the paths for
the joinrel.

			regards, tom lane

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