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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