From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Miroslav S(ulc <miroslav(dot)sulc(at)startnet(dot)cz>, PGSQL mailing list <pgsql-general(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
Subject: | Re: ERROR: variable not found in subplan target lists |
Date: | 2007-10-04 17:26:50 |
Message-ID: | 4705225A.5060605@commandprompt.com |
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Thread: | |
Lists: | pgsql-general |
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Tom Lane wrote:
> =?ISO-8859-2?Q?Miroslav_=A9ulc?= <miroslav(dot)sulc(at)startnet(dot)cz> writes:
>> Here is the complete dump and the query. In my case the bug is
>> reproducible using it.
> In a perfect world we'd not have this problem because
> const-simplification would have got rid of the IN altogether, and we'd
> have a plan equivalent to "SELECT Invoice.* FROM Invoice WHERE false".
> However making that happen seems quite difficult/risky because of
> order-of-operations issues --- we really want to do jointree
> rearrangement before we do expression simplification. Since it's
> such a hokey query (how many applications really write "WHERE false"?),
Three letters :)... O.R.M
I see this type of weirdness all the time... The most recent was
something like this:
AND ((lower(a.firstName) LIKE NULL OR NULL IS NULL)
AND (lower(a.middleName) LIKE NULL OR NULL IS NULL)
AND (lower(a.lastName) LIKE '%foo%' OR '%foo%' IS NULL)
AND (lower(b.emailAddress) LIKE NULL OR NULL IS NULL) )
Granted this isn't WHERE FALSE, but I certainly see WHERE TRUE all the
time in similar scenarios and I have seen WHERE FALSE.
Sincerely,
Joshua D. Drake
Joshua D. Drake
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