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Re: Common Table Expressions (WITH RECURSIVE) patch - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Common Table Expressions (WITH RECURSIVE) patch
Date
Msg-id 10477.1221792751@sss.pgh.pa.us
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In response to Re: Common Table Expressions (WITH RECURSIVE) patch  (Tatsuo Ishii <ishii@postgresql.org>)
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Tatsuo Ishii <ishii@postgresql.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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