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Re: Nested CASE-WHEN scoping

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Nested CASE-WHEN scoping
Date: 2011-05-25 14:47:56
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Lists: pgsql-hackers
Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
> While looking at fixing the multiple-evaluation issue in IN and BETWEEN 
> discussed a while ago, I realized that the current assumption that only 
> one CaseTestExpr placeholder needs to be valid at any given time is not 
> true.

[ scratches head ... ]  Why does the save/restore in ExecEvalCase not
take care of this?

> So I'm going to put the BETWEEN/IN fix aside for now, and refactor the 
> placeholder infrastructure to handle several simultaneous placeholders, 

That sounds like a mess, and I'm not even convinced it'll solve the
problem ...

			regards, tom lane

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