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Re: BUG #6067: In PL/pgsql, EXISTS(SELECT ... INTO...) fails

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Bruce Momjian <bruce(at)momjian(dot)us>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Fetter <dfetter(at)vmware(dot)com>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #6067: In PL/pgsql, EXISTS(SELECT ... INTO...) fails
Date: 2011-11-30 20:36:11
Message-ID: CA+TgmoZC9vwRD0rJVFE5rG4HtWQCZ9S9WSHb8nHyRBDtsPUQ2Q@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-bugs
On Tue, Nov 29, 2011 at 9:32 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> Tom Lane wrote:
>> "David Fetter" <dfetter(at)vmware(dot)com> writes:
>> >     IF EXISTS (SELECT 1 INTO STRICT i) THEN
>> >         RAISE NOTICE '%', a;
>> >     END IF;
>>
>> Umm ... are you just complaining that the error message isn't very
>> helpful, or are you actually expecting that to do something useful?
>> If the latter, what exactly?  I'm particularly confused by your use
>> of the STRICT option here, because if we did support that, I would
>> expect the STRICT to throw an error if there were not exactly one
>> matching row, making the EXISTS test 100% pointless.
>>
>> But the short answer is that we don't support INTO in sub-selects,
>> and in general I doubt that we ever will, since in most cases the
>> behavior wouldn't be very well-defined.  It might be worth a TODO
>> to provide a better error message than "syntax error", though.
>
> Is it worth documenting, fixing, or adding this to the TODO list?

At most I would say we could try to improve the error message.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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