From: | "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> |
---|---|
To: | <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | <pgsql-bugs(at)postgresql(dot)org> |
Subject: | Re: BUG #1916: selection criteria from one outer join |
Date: | 2005-09-28 15:07:11 |
Message-ID: | s33a6b5f.085@gwmta.wicourts.gov |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-bugs |
I agree that it looks like "overenthusiastic propagation
of implied equalities." (Nicely put.) I haven't tested
whether this fails in any other version (we've moved all
our instances to 8.1beta2 to pound it the best we can),
but I see that Klint Gore has reported the test case fails
in 7.4.7 and 8.0.0.
Any idea on when a fix might be available, or what
conditions must exist in a query for this failure to occur?
If this is too big to fix in 8.1, we would want to try to
identify vulnerable queries proactively, to work around
it somehow.
-Kevin
>>> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> 09/27/05 11:34 PM >>>
"Kevin Grittner" <kevin(dot)grittner(at)wicourts(dot)gov> writes:
> Obviously, adding an outer join to a query which is already returning rows
> should never reduce the number of rows returned.
I think this is a case of overenthusiastic propagation of implied
equalities. Do you know offhand if it fails in 8.0.* or earlier
branches?
regards, tom lane
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2005-09-28 15:12:48 | Re: BUG #1916: selection criteria from one outer join on clause applied to other joins |
Previous Message | Tom Lane | 2005-09-28 14:36:43 | Re: BUG #1915: ERROR: RETURN cannot have a parameter in function returning void at or near "NULL" at character 148 |