John Wang created LUCENE-5488:
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Summary: FilteredQuery.explain does not honor FilterStrategy
Key: LUCENE-5488
URL: https://issues.apache.org/jira/browse/LUCENE-5488
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 4.6.1
Reporter: John Wang
Some Filter implementations produce DocIdSets without the iterator()
implementation, such as o.a.l.facet.range.Range.getFilter(). It is done with
the intention to be used in conjunction with FilteredQuery with FilterStrategy
set to be QUERY_FIRST_FILTER_STRATEGY for performance reasons.
However, this behavior is not honored by FilteredQuery.explain where
docidset.iterator is called regardless and causing such valid usages of above
filter types to fail.
The fix is to check bits() first and and fall back to iterator if bits is null.
In which case, the input Filter is indeed bad.
See attached unit test, which fails without this patch.
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