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Posted to java-user@lucene.apache.org by slashone <sa...@gmail.com> on 2012/11/23 08:27:10 UTC
Query.combine() has been removed in lucene 4.0 ??
is this method has been moved to some other class ?
please provide alternative ..
--
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RE: Query.combine() has been removed in lucene 4.0 ??
Posted by Uwe Schindler <uw...@thetaphi.de>.
What are you trying to do with Query.combine? I want to just note, that the method creates wrong results for certain queries!
-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de
> -----Original Message-----
> From: slashone [mailto:sachinwalvekar007@gmail.com]
> Sent: Friday, November 23, 2012 12:18 PM
> To: java-user@lucene.apache.org
> Subject: RE: Query.combine() has been removed in lucene 4.0 ??
>
> Hi Uwe Schindler,
>
> thanks for your response.
>
> I had requirement to combine few custom queries and i found that
> Query.combine() was readily available .
> So i had used that method. Now i am migrating code to lucene 4.0 ,hence
> found this issue..
>
> thanks
>
>
>
>
> --
> View this message in context: http://lucene.472066.n3.nabble.com/Query-
> combine-has-been-removed-in-lucene-4-0-tp4021971p4022009.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
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RE: Query.combine() has been removed in lucene 4.0 ??
Posted by slashone <sa...@gmail.com>.
Hi Uwe Schindler,
thanks for your response.
I had requirement to combine few custom queries and i found that
Query.combine() was readily available .
So i had used that method. Now i am migrating code to lucene 4.0 ,hence
found this issue..
thanks
--
View this message in context: http://lucene.472066.n3.nabble.com/Query-combine-has-been-removed-in-lucene-4-0-tp4021971p4022009.html
Sent from the Lucene - Java Users mailing list archive at Nabble.com.
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RE: Query.combine() has been removed in lucene 4.0 ??
Posted by Uwe Schindler <uw...@thetaphi.de>.
Hi,
this looks like a XY problem: You should explain first what you want to do, so we can find a solution for you.
About Query.combine(): This method was solely a "helper" method only for use by the (Parallel-)MultiSearcher classes in Lucene, which were deprecated in 3.x and completely removed in Lucene 4. MultiSearcher had some serious problems with some type of queries (incorrect Boolean query expansion,...), which was especially caused by this method - which was completely undocumented and behaving wrong. The reason for this method was some custom rewrite logic, if a query must be executed on different IndexSearchers where the term dictionaries on the underlying IndexReaders were different.
The replacement for MultiSearcher and ParallelMultiSearcher in Lucene 4.0 is to use MultiReader with a single IndexSearcher and parallelization supported by passing an ExecutorSearvice to the IndexSearcher. Query.combine was removed because the (broken) MultiSearcher-Rewrite-Hack is no longer needed.
Uwe
-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de
> -----Original Message-----
> From: slashone [mailto:sachinwalvekar007@gmail.com]
> Sent: Friday, November 23, 2012 8:27 AM
> To: java-user@lucene.apache.org
> Subject: Query.combine() has been removed in lucene 4.0 ??
>
> is this method has been moved to some other class ?
> please provide alternative ..
>
>
>
> --
> View this message in context: http://lucene.472066.n3.nabble.com/Query-
> combine-has-been-removed-in-lucene-4-0-tp4021971.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
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