sub-selects in CHECK

From: nconway(at)klamath(dot)dyndns(dot)org (Neil Conway)
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: sub-selects in CHECK
Date: 2002-07-27 21:03:00
Message-ID: 20020727210300.GA1126@klamath.dyndns.org
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I'd like to add the ability to use a sub-select in a CHECK constraint.
Can someone elaborate on what changes would be needed to support
this? From a (very) brief look at execMain.c, ExecEvalExpr() seems
to support subplans already, so I wouldn't *guess* it would be too
involved, but I'd appreciate a more informed assessment...

Thanks in advance,

Neil

--
Neil Conway <neilconway(at)rogers(dot)com>
PGP Key ID: DB3C29FC

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