| 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 |
| Message-ID: | 5487.1306334876@sss.pgh.pa.us |
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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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