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Posted to dev@lucene.apache.org by "Ryan Ernst (JIRA)" <ji...@apache.org> on 2015/02/20 20:16:11 UTC
[jira] [Created] (LUCENE-6271) PostingsEnum should have consistent
flags behavior
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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