Adrien Grand created LUCENE-5938:
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Summary: New DocIdSet implementation with random write access
Key: LUCENE-5938
URL: https://issues.apache.org/jira/browse/LUCENE-5938
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Assignee: Adrien Grand
We have a great cost API that is supposed to help make decisions about how to
best execute queries. However, due to the fact that several of our filter
implementations (eg. TermsFilter and BooleanFilter) return FixedBitSets, either
we use the cost API and make bad decisions, or need to fall back to heuristics
which are not as good such as RandomAccessFilterStrategy.useRandomAccess which
decides that random access should be used if the first doc in the set is less
than 100.
On the other hand, we also have some nice compressed and cacheable DocIdSet
implementation but we cannot make use of them because TermsFilter requires a
DocIdSet that has random write access, and FixedBitSet is the only DocIdSet
that we have that supports random access.
I think it would be nice to replace FixedBitSet in those filters with another
DocIdSet that would also support random write access but would have a better
cost?
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