Adrien Grand created LUCENE-7677:
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Summary: Cache compound filters earlier than regular queries
Key: LUCENE-7677
URL: https://issues.apache.org/jira/browse/LUCENE-7677
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Priority: Minor
Say you keep reusing a boolean filter that looks like "A OR B" and never use
the A and B queries out of that boolean query. Currently, after this filter has
been used 5 times, we would cache both A, B and "A OR B", which means that
cache entries for A and B would only be built for the purpose of building a
cache entry for "A OR B", which is wasteful.
By caching compound queries a bit earlier, we could make it less likely to
happen since:
- we only consider queries as consumed if a scorer is pulled
- once the boolean query is cached, we stop pulling scorers on the A and B
queries
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