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https://issues.apache.org/jira/browse/LUCENE-5081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13696116#comment-13696116
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Uwe Schindler commented on LUCENE-5081:
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bq. EG for BJQ's tests, can't they override CWF.docIdSetToCache to return a
FixedBitSet? Then we can decouple the two issues?
Good idea, this patch should just fix the test for now.
One thing: The Bitset does not implement {{public Bits bits()}} so it's not
random access. This means that a cached CompressedDocIdSet cannot be applied
down-low. Is it possible to make it random access at all? The default method
returned by the superclass DocIdSet returns null, so FilteredQuery would fall
back to the iterator.
> 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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