Change ChainedFilter to use FixedBitSet
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Key: LUCENE-3459
URL: https://issues.apache.org/jira/browse/LUCENE-3459
Project: Lucene - Java
Issue Type: Task
Reporter: Uwe Schindler
ChainedFilter also uses OpenBitSet(DISI) at the moment. It should also be
changed to use FixedBitSet. There are two issues:
- It exposes sometimes OpenBitSetDISI to it's public API - we should remove
those methods like in BooleanFilter and break backwards
- It allows a XOR operation. This is not yet supported by FixedBitSet, but it's
easy to add (like for BooleanFilter). On the other hand, this XOR operation is
bogus, as it may mark documents in the BitSet that are deleted, breaking new
features like applying Filters down-low (LUCENE-1536). We should remove the XOR
operation maybe or force it to use IR.validDocs() (trunk) or IR.isDeleted()
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