John Wang created LUCENE-5495:
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Summary: Boolean Filter does not handle FilterClauses with only
bits() implemented
Key: LUCENE-5495
URL: https://issues.apache.org/jira/browse/LUCENE-5495
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().
Currently, such filters cannot be added to a BooleanFilter because
BooleanFilter expects all FilterClauses with Filters that have iterator()
implemented.
This patch improves the behavior by taking Filters with bits() implemented and
treat them separately.
This behavior would be faster in the case for Filters with a forward index as
the underlying data structure, where there would be no need to scan the index
to build an iterator.
See attached unit test, which fails without this patch.
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