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Date: Fri, 2 Feb 2007 09:20:56 +0000 (GMT)
From: mark harwood <markharw00d@yahoo.co.uk>
Subject: Re: MatchAllDocs in BooleanQuery.rewrite
To: java-dev@lucene.apache.org
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>>are there any legitimate usecases for calling rewrite other then when a S=
earcher is about to execute the query?=0A=0AWhen using the highlighter it i=
s recommended to use a rewritten query e.g. to get all the variations for a=
 fuzzy query.=0AHowever I don't think there should be a problem with the au=
to-MatchAllDocs approach you suggest. =0AIncidentally, the "BooleanFilter" =
class in contrib/queries adopts the same must/should/mustnot logic as Boole=
anQuery (except using Filter clauses rather than Querys) and already includ=
es the logic you suggest if there are only negative clauses.=0A=0ACheers=0A=
Mark=0A=0A----- Original Message ----=0AFrom: Chris Hostetter <hossman_luce=
ne@fucit.org>=0ATo: Lucene Dev <java-dev@lucene.apache.org>=0ASent: Friday,=
 2 February, 2007 6:26:46 AM=0ASubject: MatchAllDocs in BooleanQuery.rewrit=
e=0A=0A=0Amore then once, people have suggested that QueryParser should eit=
her throw=0Aand Exception or implicitly put a MatchAllDocsQuery in any Bool=
eanQuery it=0Aproduces when the string it's parsing contains entirely negat=
ive clauses.=0A=0AI've argued against this idea because QueryParser doesn't=
 know how the=0AQuery it's producing is oging to be used ... many people (m=
yself included)=0Ause it to parse some user input, which they then combine =
with other=0Aautomaticaly constructed clauses -- and the MatchAllDocsQuery =
would be a=0Abad idea.=0A=0Areplying to question about this tonight, it occ=
ured to me that=0ABooleanQuery.rewrite might be a feasible place for code t=
hat automaticly=0Aincludes a MatchAllDocsQuery when all clauses are negativ=
e ... are there=0Aany legitimate usecases for calling rewrite other then wh=
en a Searcher is=0Aabout to execute the query?=0A=0A=0A-Hoss=0A=0A=0A------=
---------------------------------------------------------------=0ATo unsubs=
cribe, e-mail: java-dev-unsubscribe@lucene.apache.org=0AFor additional comm=
ands, e-mail: java-dev-help@lucene.apache.org=0A=0A=0A=0A=0A=0A=0A=09=09=0A=
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