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https://issues.apache.org/jira/browse/LUCENE-3459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592740#comment-13592740
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David Smiley commented on LUCENE-3459:
--------------------------------------
Ha! I was just about to report the reverse problem -- make TermsFilter return
OpenBitset for optimal compatibility with ChainedFilter. I'm using
TermsFilters with ChainedFilter and the mis-match of OpenBitSet and FixedBitSet
is definitely not optimal since I want it to intersect those bitsets together
quickly.
I don't understand why there are both. My IDE says FixedBitSet has 206 usages
compared to OpenBitSet's 230. That's closer than I thought. I recall
[~thetaphi] saying he would like OBS deprecated, but I pointed out that it is
OBS that is fully public and FixedBitSet that is marked as @lucene.internal.
> 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
> Fix For: 4.2
>
>
> 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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