Ryan Ernst created LUCENE-6256:
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Summary: PostingsEnum impls should respect documented behavior
when no positions exist
Key: LUCENE-6256
URL: https://issues.apache.org/jira/browse/LUCENE-6256
Project: Lucene - Core
Issue Type: Bug
Reporter: Ryan Ernst
{{PostingsEnum.nextPositions}} says that if no positions exist, NO_MORE_DOCS
will be returned on the first call (actually it refers to
DocsEnum.NO_MORE_DOCS, which should be changed since DocsEnum doesn't exist on
trunk). At least one impl (BlockDocsEnum) does {{assert false}} inside
{{nextPosition()}}. This means if you have assertions turned on (e.g. in a
test) you get an assertion here, when the behavior should return NO_MORE_DOCS.
I'm still going through all the implementations, but I also see
{{MultiTermHighlighting}} which returns {{Integer.MAX_VALUE}}. I think we
should clean up all these implementations which have no positions (including
maybe the fake scorers that are copied around in a lot of places?) to return
NO_MORE_DOCS.
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