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Re: Performance improvement for joins where outer side is unique - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Performance improvement for joins where outer side is unique
Date
Msg-id 12606.1424972064@sss.pgh.pa.us
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In response to Re: Performance improvement for joins where outer side is unique  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
Responses Re: Performance improvement for joins where outer side is unique  (Tomas Vondra <tomas.vondra@2ndquadrant.com>)
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Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
> FWIW this apparently happens because the code only expect that
> EquivalenceMembers only contain Var, but in this particular case that's
> not the case - it contains RelabelType (because oprcode is regproc, and
> needs to be relabeled to oid).

If it thinks an EquivalenceMember must be a Var, it's outright broken;
I'm pretty sure any nonvolatile expression is possible.
        regards, tom lane

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