Re: Wrong Results - Bad Execution Plan
- From: "Henry Poras" <henry@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 19 Nov 2007 11:24:46 -0500
I'll post it if and when I get it. If this is an existing bug I haven't
tracked it down yet. If it is new, Oracle hasn't assigned a bug# to it (they
are still playing the 'send me your poor, your tired database and I'll see
what I can do' game.).
Henry
> -----Original Message-----
> From: Bob Carlin [mailto:smeghead.rimmer@xxxxxxxxx]
> Sent: Saturday, November 17, 2007 12:01 PM
> To: henry@xxxxxxxxxxxxxxx
> Cc: oracle-l@xxxxxxxxxxxxx
> Subject: Re: Wrong Results - Bad Execution Plan
>
>
> Henry,
> Do you have the bug number for this issue?
>
> Henry Poras wrote:
> > Oracle can, on occasion, generate an execution plan which
> returns incorrect
> > results.
> >
> > In our 10.2.0.3 database we have two SQL queries which
> should give identical
> > result sets, but don't. Outside of a filter which does not
> apply, the
> > queries are logically identical. They do, however, resolve
> to different
> > execution plans, one of which is correct and the other
> which is WRONG.
> >
...
> >
> > For the "OUTER" query, the execution plan should read
> > VIEW
> > FILTER
> >
> > and not
> >
> > FILTER
> > VIEW
> >
> > This is the bug!!!
> >
> > The final filter in "OUTER" filters on a.1 for the MAX
> clause, not b.1 as is
> > correct, since a.1 is the only value for 1 passed through the view.
> > Henry
> >
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