Re: Common Table Expressions (WITH RECURSIVE) patch

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Tatsuo Ishii <ishii(at)postgresql(dot)org>
Cc: pgsql(at)j-davis(dot)com, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Common Table Expressions (WITH RECURSIVE) patch
Date: 2008-09-19 02:52:31
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Tatsuo Ishii <ishii(at)postgresql(dot)org> writes:
>> Why does set_recursion_pathlist think that the subquery might have
>> useful pathkeys? We know it must always be a UNION ALL, no?

> Right. But someday we might implement "UNION" (without ALL) then we
> have useful pathkeys...

Good point. Might as well leave it in.

regards, tom lane

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