Re: Improving planning of outer joins

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Improving planning of outer joins
Date: 2005-12-15 14:03:23
Message-ID: 87ek4ee9uc.fsf@stark.xeocode.com
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Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

> There is some stuff in the literature about how to make transformations
> of the last kind, but it requires additional executor smarts to do strange
> sorts of "generalized outer join" operations.

Would these "generalized outer join" operations be general enough to handle IN
semantics? Or other subqueries?

--
greg

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