Robert Muir created LUCENE-8031:
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Summary: DOCS_ONLY fields set incorrect length norms
Key: LUCENE-8031
URL: https://issues.apache.org/jira/browse/LUCENE-8031
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
Priority: Major
Term frequencies are discarded in the DOCS_ONLY case from the postings list but
they still count against the length normalization, which looks like it may
screw stuff up.
I ran some quick experiments on LUCENE-8025, by encoding
fieldInvertState.getUniqueTermCount() and it seemed worth fixing (e.g. 20% or
30% improvement potentially). Happy to do testing for real, if we want to fix.
But this seems tricky, today you can downgrade to DOCS_ONLY on the fly, and its
hard for me to think about that case (i think its generally screwed up besides
this, but still).
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