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https://issues.apache.org/jira/browse/LUCENE-5938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153101#comment-14153101
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ASF subversion and git services commented on LUCENE-5938:
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Commit 1628406 from [~jpountz] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1628406 ]
LUCENE-5938: Add a new sparse fixed bit set and remove ConstantScoreAutoRewrite.
> New DocIdSet implementation with random write access
> ----------------------------------------------------
>
> Key: LUCENE-5938
> URL: https://issues.apache.org/jira/browse/LUCENE-5938
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Attachments: LUCENE-5938.patch, LUCENE-5938.patch, LUCENE-5938.patch,
> LUCENE-5938.patch, LUCENE-5938.patch, low_freq.tasks
>
>
> We have a great cost API that is supposed to help make decisions about how to
> best execute queries. However, due to the fact that several of our filter
> implementations (eg. TermsFilter and BooleanFilter) return FixedBitSets,
> either we use the cost API and make bad decisions, or need to fall back to
> heuristics which are not as good such as
> RandomAccessFilterStrategy.useRandomAccess which decides that random access
> should be used if the first doc in the set is less than 100.
> On the other hand, we also have some nice compressed and cacheable DocIdSet
> implementation but we cannot make use of them because TermsFilter requires a
> DocIdSet that has random write access, and FixedBitSet is the only DocIdSet
> that we have that supports random access.
> I think it would be nice to replace FixedBitSet in those filters with another
> DocIdSet that would also support random write access but would have a better
> cost?
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