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https://issues.apache.org/jira/browse/LUCENE-3459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13896308#comment-13896308
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Uwe Schindler commented on LUCENE-3459:
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Cool, thanks! I wanted to do this since 4.0 :( Many thanks!
> Change ChainedFilter to use FixedBitSet
> ---------------------------------------
>
> Key: LUCENE-3459
> URL: https://issues.apache.org/jira/browse/LUCENE-3459
> Project: Lucene - Core
> Issue Type: Task
> Components: modules/other
> Affects Versions: 3.4, 4.0-ALPHA
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
>
> ChainedFilter also uses OpenBitSet(DISI) at the moment. It should also be
> changed to use FixedBitSet. There are two issues:
> - It exposes sometimes OpenBitSetDISI to it's public API - we should remove
> those methods like in BooleanFilter and break backwards
> - It allows a XOR operation. This is not yet supported by FixedBitSet, but
> it's easy to add (like for BooleanFilter). On the other hand, this XOR
> operation is bogus, as it may mark documents in the BitSet that are deleted,
> breaking new features like applying Filters down-low (LUCENE-1536). We should
> remove the XOR operation maybe or force it to use IR.validDocs() (trunk) or
> IR.isDeleted()
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