Robert Muir created LUCENE-6309:
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Summary: disable coord when scores are not needed, or the scoring
fn does not use it
Key: LUCENE-6309
URL: https://issues.apache.org/jira/browse/LUCENE-6309
Project: Lucene - Core
Issue Type: Task
Reporter: Robert Muir
In BooleanWeight when disableCoord is set, things are nicer. coord makes things
complex (e.g. sometimes requires some crazy scorers in BooleanTopLevelScorers)
and can block optimizations.
We should also implicitly disableCoord when scores are not needed, or when the
Similarity does not use coord().
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