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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: Apply Lucene Query on Bits
Date Mon, 05 Dec 2016 17:18:40 GMT
Hi,

you may also have a look at the implementation of the PKIndexSplitter, doing exactly what
you want (applying a FilterReader / FilterCodecReader that hides documents matched by a query):
https://github.com/apache/lucene-solr/blob/master/lucene/misc/src/java/org/apache/lucene/index/PKIndexSplitter.java#L127-L170

Uwe

-----
Uwe Schindler
Achterdiek 19, D-28357 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de

> -----Original Message-----
> From: Adrien Grand [mailto:jpountz@gmail.com]
> Sent: Monday, December 5, 2016 3:35 PM
> To: java-user@lucene.apache.org
> Subject: Re: Apply Lucene Query on Bits
> 
> Do I get it right that you have a query that defines a set of visible
> documents, and you want to make sure that your FilterReader only sees
> those
> documents?
> 
> If this is the case, then you could use FixedBitSet.or to load the
> Scorer.iterator() into a FixedBitSet, and then maintain two caches:
>  - one from the core cache key to the bit set of visible documents,
>  - one from the core and deletes cache key to the number of documents in
> the index, this numDocs could be recomputed by iterating the bit set of
> visible documents, and counting how many of them are not deleted.
> 
> Le dim. 4 déc. 2016 à 10:04, Hendrik Dev <hendrikdev22@gmail.com> a écrit
> :
> 
> > how to apply a org.apache.lucene.search.Query on a given
> > org.apache.lucene.util.Bits object?
> >
> > Background: I have a subclass of
> > org.apache.lucene.index.FilterLeafReader where i want to filter the
> > livedocs by applying a query on the "Bits".
> >
> > According to javadoc i need also to override numDocs() if i override
> > getLiveDocs(). So the question extends also to how to filter the
> > number of documents based on a query (within a FilterLeafReader)
> >


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