If we intend to make more use of filters this may be an appropriate time to raise a general question I have on their use. Is there a danger in tieing them to a specific implementation (java.util.BitSet)?
I do not object in principal to replacing BitSet with an interface, e.g. DocIdSet. Please feel free to submit a more detailed proposal for this. I think this is not so performance intensive that an extra method call will be significant. If it is, then we can simply have Lucene's BitVector implement this interface directly.
We must be careful to preserve the distinction between Filter and DocIdSet. Filters are query-independent and serializeable, passed across the wire with RemoteSearchable requests. DocIdSets are query-dependent, should be computed and cached locally, and not passed over the wire.
Doug
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