Re: (PATCH) Adding CORRESPONDING to Set Operations

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Kerem Kat <keremkat(at)gmail(dot)com>
Cc: Thom Brown <thom(at)linux(dot)com>, Erik Rijkers <er(at)xs4all(dot)nl>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: (PATCH) Adding CORRESPONDING to Set Operations
Date: 2011-11-14 13:32:47
Message-ID: 24578.1321277567@sss.pgh.pa.us
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Kerem Kat <keremkat(at)gmail(dot)com> writes:
> Corresponding is currently implemented in the parse/analyze phase. If
> it were to be implemented in the planning phase, explain output would
> likely be as you expect it to be.

It's already been pointed out to you that doing this at parse time is
unacceptable, because of the implications for reverse-listing of rules
(views).

regards, tom lane

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