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https://issues.apache.org/jira/browse/LUCENE-3254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-3254.
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Resolution: Fixed
> BitVector.isSparse is sometimes wrong
> -------------------------------------
>
> Key: LUCENE-3254
> URL: https://issues.apache.org/jira/browse/LUCENE-3254
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/other
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3254.patch
>
>
> In working on LUCENE-3246, I found a few problems with
> BitVector.isSparse:
> * Its math can overflow int, such that if there are enough deleted
> docs and maxDoc() is largish, isSparse may incorrectly return true
> * It over-estimates the size of the sparse file, since when
> estimating number of bytes for the vInt dgaps it uses bits.length
> instead of bits.length divided by number of set bits (ie, the
> "average" gap between set bits)
> This is relatively harmless (just affects performance / size of .del
> file on disk, not correctness).
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