Adrien Grand created LUCENE-6091:
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Summary: UsageTrackingFilterCachingPolicy does not handle the null
DocIdSet case
Key: LUCENE-6091
URL: https://issues.apache.org/jira/browse/LUCENE-6091
Project: Lucene - Core
Issue Type: Bug
Reporter: Adrien Grand
Assignee: Adrien Grand
Priority: Minor
I found a NullPointerException while playing with it since it is legal for
filters to return a null DocIdSet when they don't match any documents on a
segment.
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