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https://issues.apache.org/jira/browse/LUCENE-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13705114#comment-13705114
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Uwe Schindler commented on LUCENE-5081:
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bq. I am not sure how these are used today. I was just asking in case there is
something relying upon this. If they are just added as a "bonus" and not really
needed by our codebase, then I am not sure we should worry... but its up to you.
+1, I have no use case at the moment to compare DocIdSets. Especially not
cross-implementation.
> WAH8DocIdSet
> ------------
>
> Key: LUCENE-5081
> URL: https://issues.apache.org/jira/browse/LUCENE-5081
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5081.patch, LUCENE-5081.patch
>
>
> Our filters use bit sets a lot to store document IDs. However, it is likely
> that most of them are sparse hence easily compressible. Having efficient
> compressed sets would allow for caching more data.
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