Shai Erera created LUCENE-5460:
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Summary: Allow driving a query by sparse filters
Key: LUCENE-5460
URL: https://issues.apache.org/jira/browse/LUCENE-5460
Project: Lucene - Core
Issue Type: Improvement
Components: core/search
Reporter: Shai Erera
Today if a filter is very sparse we execute the query in sort of a leap-frog
manner between the query and filter. If the query is very expensive to compute,
and/or matching few docs only too, calling scorer.advance(doc) just to discover
the doc it landed on isn't accepted by the filter, is a waste of time. Since
Filter is always the "final ruler", I wonder if we had something like {{boolean
DISI.advanceExact(doc)}} we could use it instead, in some cases.
There are many combinations in which I think we'd want to use/not-use this API,
and they depend on: Filter's complexity, Filter.cost(), Scorer.cost(), query
complexity (span-near, many clauses) etc.
I open an issue so we can discuss. DISI.advanceExact(doc) is just a preliminary
proposal, to get an API we could experiment with. The default implementation
should be fairly easy and straightforward, and we could override where we can
offer a more optimized imp.
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