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https://issues.apache.org/jira/browse/LUCENE-5993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14160238#comment-14160238
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Adrien Grand commented on LUCENE-5993:
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+1 for some reason I was convinced we removed that one a long time ago!
> Remove WAH8DocIdSet and PForDeltaDocIdSet
> -----------------------------------------
>
> Key: LUCENE-5993
> URL: https://issues.apache.org/jira/browse/LUCENE-5993
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 5.0
>
>
> Follow-up of LUCENE-5983. We now have 6 doc id set implementations that can
> be used to cache filter:
> - FixedBitSet
> - WAH8DocIdSet
> - PForDeltaDocIdSet
> - EliasFanoDocIdSet
> - SparseFixedBitSet
> - RoaringDocIdSet
> Some of them are required due to unique features that they have (eg.
> SparseFixedBitSet due to random write-access) but I'm thinking of removing
> WAH8DocIdSet and PForDeltaDocIdSet since RoaringDocIdSet also has the ability
> to inverse its encoding in the super-dense case (WAH8 and PForDelta were the
> only sets to have this ability until now) and tends to be faster to build and
> to advance.
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