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Re: BUG #5084: Query gives different number of rows depending on ORDER BY - Mailing list pgsql-bugs

From Tom Lane
Subject Re: BUG #5084: Query gives different number of rows depending on ORDER BY
Date
Msg-id 13213.1254166040@sss.pgh.pa.us
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In response to Re: BUG #5084: Query gives different number of rows depending on ORDER BY  (Andrew Gierth <andrew@tao11.riddles.org.uk>)
Responses Re: BUG #5084: Query gives different number of rows depending on ORDER BY  (Tom Lane <tgl@sss.pgh.pa.us>)
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Andrew Gierth <andrew@tao11.riddles.org.uk> writes:
> Notice that the (k = k) qual is being dropped somewhere, which changes
> the output since that's a disguised not-null condition.

Huh ... I'm surprised it only does that with the ORDER BY present.
I suppose it's got something to do with the equivalence-class machinery.

            regards, tom lane

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