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https://issues.apache.org/jira/browse/LUCENE-5495?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13924224#comment-13924224
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Lei Wang commented on LUCENE-5495:
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please drop my FixedBitSet or OpenBitSet suggestion. for the FixedBitSet or
OpenBitSet, which way is faster depends on the use case i think. without
merging should be ok.
> Boolean Filter does not handle FilterClauses with only bits() implemented
> -------------------------------------------------------------------------
>
> Key: LUCENE-5495
> URL: https://issues.apache.org/jira/browse/LUCENE-5495
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Affects Versions: 4.6.1
> Reporter: John Wang
> Attachments: LUCENE-5495.patch
>
>
> Some Filter implementations produce DocIdSets without the iterator()
> implementation, such as o.a.l.facet.range.Range.getFilter().
> Currently, such filters cannot be added to a BooleanFilter because
> BooleanFilter expects all FilterClauses with Filters that have iterator()
> implemented.
> This patch improves the behavior by taking Filters with bits() implemented
> and treat them separately.
> This behavior would be faster in the case for Filters with a forward index as
> the underlying data structure, where there would be no need to scan the index
> to build an iterator.
> See attached unit test, which fails without this patch.
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