[jira] [Created] (LUCENE-6427) BitSet fixes - assert on presence of 'ghost bits' and others

["Luc Vanlerberghe (JIRA)" <ji...@apache.org>]

Luc Vanlerberghe created LUCENE-6427:
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             Summary: 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


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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