Ryan Ernst created LUCENE-6271:
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Summary: PostingsEnum should have consistent flags behavior
Key: LUCENE-6271
URL: https://issues.apache.org/jira/browse/LUCENE-6271
Project: Lucene - Core
Issue Type: Bug
Reporter: Ryan Ernst
When asking for flags like OFFSETS or PAYLOADS with DocsAndPositionsEnum, the
behavior was to always return an enum, even if offsets or payloads were not
indexed. They would just not be available from the enum if they were not
present. This behavior was carried over to PostingsEnum, which is good.
However, the new POSITIONS flag has different behavior. If positions are not
available, null is returned, instead of a PostingsEnum that just gives access
to freqs. This behavior is confusing, as it means you have to special case
asking for positions (only ask if you know they were indexed) which sort of
defeats the purpose of the unified PostingsEnum.
We should make POSITIONS have the same behavior as other flags. The trickiest
part will be maintaining backcompat for DocsAndPositionsEnum in 5.x, but I
think it can be done.
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