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https://issues.apache.org/jira/browse/LUCENE-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12903947#action_12903947
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Paul Elschot commented on LUCENE-2628:
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Using an interface for DocIdSet would freeze DocIdSet forever and that would
not be advisable.
Nowadays the JITs might allow the use of delegation instead of inheritance
without losing performance,
so one might reasonably try to delegate to OBS to avoid freezing DocIdSet. That
would involve an extra class, but an extra class should be no problem.
> Extract OpenBitSet to Apache Commons
> ------------------------------------
>
> Key: LUCENE-2628
> URL: https://issues.apache.org/jira/browse/LUCENE-2628
> Project: Lucene - Java
> Issue Type: Wish
> Reporter: Stu Hood
>
> o.a.l.util.OpenBitSet is a great alternative to java.util.BitSet, and it is
> generally useful outside of the search field. It would be great if OpenBitSet
> were available outside of Lucene proper, perhaps as part of Apache Commons.
> Aside from the communication required to accomplish this, there is the small
> issue of OpenBitSet extending o.a.l.search.DocIdSet in Lucene 3.0. There is
> very little logic contained in DocIdSet, so it could probably become an
> interface: Lucene proper could then extend the extract version of OpenBitSet
> to implement DocIdSet.
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