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https://issues.apache.org/jira/browse/LUCENE-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696099#comment-13696099
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Robert Muir commented on LUCENE-5081:
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Thanks for opening this Adrien!
{quote}
The patch includes the set implementation but it is not used anywhere yet. I
was thinking about using it automatically instead of FixedBitSet in
CachingWrapperFilter but it looks like ToParentBlockJoinQuery expects to get a
FixedBitSet from the cache.
{quote}
Maybe we should anticipate more implementations in the future? I know there are
a lot of algorithms and "Compressed" is pretty general.
As far as ToParentBlockJoinQuery, i dont think it should make these
assumptions... that seems wrong for it to do that.
> 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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