Robert Muir created LUCENE-5117:
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Summary: DISI.iterator() should never return null.
Key: LUCENE-5117
URL: https://issues.apache.org/jira/browse/LUCENE-5117
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
If you have a Filter, you have to check for null twice: Filter.getDocIDSet()
can return a null DocIDSet, and then DocIDSet.iterator() can return a null
iterator.
There is no reason for this: I think iterator() should never return null
(consistent with terms/postings apis).
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