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https://issues.apache.org/jira/browse/LUCENE-6427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14518009#comment-14518009
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ASF subversion and git services commented on LUCENE-6427:
---------------------------------------------------------
Commit 1676624 from [~jpountz] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1676624 ]
LUCENE-6427: Added assertion about the presence of ghost bits in
(Fixed|Long)BitSet.
> BitSet fixes - assert on presence of 'ghost bits' and others
> ------------------------------------------------------------
>
> Key: LUCENE-6427
> URL: https://issues.apache.org/jira/browse/LUCENE-6427
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/other
> Reporter: Luc Vanlerberghe
> Fix For: Trunk, 5.2
>
>
> Fixes after reviewing org.apache.lucene.util.FixedBitSet, LongBitSet and
> corresponding tests:
> * Some methods rely on the fact that no bits are set after numBits (what I
> call 'ghost' bits here).
> ** cardinality, nextSetBit, intersects and others may yield wrong results
> ** If ghost bits are present, they may become visible after ensureCapacity is
> called.
> ** The tests deliberately create bitsets with ghost bits, but then do not
> detect these failures
> * FixedBitSet.cardinality scans the complete backing array, even if only
> numWords are in use
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