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https://issues.apache.org/jira/browse/LUCENE-5293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799130#comment-13799130
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Paul Elschot commented on LUCENE-5293:
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bq. I don't like much having support for specific filters based on instanceof
calls.
Me neither, but that can be fixed by adding a docFreq() method to DocIdSet, as
another hint to be used by CachingWrapperFilter.
This method should return the actual number of doc ids in the set when its
return value >= 0.
The existing hint in DocIdSet is isCacheable(), its javadocs will need to
updated since they need not mention BitSet anymore.
I also prefer option 2, but I'd like to avoid using the other filter impl when
possible by using the docFreq hint.
I'll try and make another patch for this.
> Also use EliasFanoDocIdSet in CachingWrapperFilter
> --------------------------------------------------
>
> Key: LUCENE-5293
> URL: https://issues.apache.org/jira/browse/LUCENE-5293
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Reporter: Paul Elschot
> Priority: Minor
> Attachments: LUCENE-5293.patch
>
>
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