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https://issues.apache.org/jira/browse/LUCENE-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700111#comment-13700111
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Adrien Grand commented on LUCENE-5081:
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bq. The use case in BlockJoinQuery has nothing to do with filters, it needs a
special implementation to seek backwards
bq. For backward iteration I think it would be good to extend DocIdSetIterator
with backwards iterating method(s), possibly in a subclass, and use an
implementation of that in the block joins.
I opened LUCENE-5092.
> Compress doc ID sets
> --------------------
>
> 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
> Attachments: 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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