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From: "Uwe Schindler" <uwe@thetaphi.de>
To: <java-user@lucene.apache.org>
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Subject: RE: Search returning documents matching a NOT range
Date: Wed, 10 Nov 2010 19:04:50 +0100
Message-ID: <001301cb8101$c5400a50$4fc01ef0$@thetaphi.de>
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I know where the bug is...

The problem has nothing to to with MultiSearcher at all, its just the =
rewritten query. Because (as Robert said) MultiSearcher rewrites per =
index, the rewritten query is different for each sub-index. The =
problems, Robert mentioned only affect scoring (which is different). As =
Range is ConstantScore it should still return same documents.

The problem here seems to be that in the first searcher der Boolean =
rewrites to an empty BooleanQuery(), which is fine for ranges that hit =
no terms at all (this is also supported and works). The problem seems to =
be that a SHOULD_NOT clause on an empty Boolean query produces this bug!

I will try to reproduce with an easy testcase using a single IndexReader =
and single IndexSearcher.

The reason why you sometimes don't see the problem is, that auto rewrite =
not always rewrites to BooleanQuery.

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de

> -----Original Message-----
> From: Robert Muir [mailto:rcmuir@gmail.com]
> Sent: Wednesday, November 10, 2010 1:25 PM
> To: java-user@lucene.apache.org
> Cc: David Fertig
> Subject: Re: Search returning documents matching a NOT range
>=20
> On Wed, Nov 10, 2010 at 7:00 AM, Robert Muir <rcmuir@gmail.com> wrote:
> > On Mon, Nov 8, 2010 at 6:45 AM, Ian Lea <ian.lea@gmail.com> wrote:
> >> This does seem extremely odd.  David sent me a copy of his index =
and
> >> I've played around with it and also written a self-contained RAM
> >> index program, below, that shows the same problem, namely that if =
the
> >> second index has 1000+ docs the one and only doc in the first index
> >> is incorrectly matched if the search is done with a MultiSearcher.
> >> In answer to Uwe's question, it works correctly if use a single
> >> IndexSearcher on top of a MultiReader.
> >
>=20
> I played with your testcase, and it seems the rewrite() implementation =
is
> causing the strangeness you see.
> for your query: author:aaa -pubdate:[aaa TO bbb], here are the =
rewritten
> forms:
>=20
> MultiReader case: +author:aaa -ConstantScore(pubdate:[aaa TO bbb])
> MultiSearcher case: (+author:aaa -()) (+author:aaa -
> ConstantScore(pubdate:[aaa TO bbb]))
>=20
> ---------------------------------------------------------------------
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