Clone proxStream lazily in SegmentTermPositions
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Key: LUCENE-761
URL: http://issues.apache.org/jira/browse/LUCENE-761
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Michael Busch
Priority: Minor
In SegmentTermPositions the proxStream should be cloned lazily, i. e. at the
first time nextPosition() is called. Then the initialization costs of
TermPositions are not higher anymore compared to TermDocs and thus there is no
reason anymore for Scorers to use TermDocs instead of TermPositions. In fact,
all Scorers should use TermPositions, because custom subclasses of existing
scorers might want to access payloads, which is only possible via
TermPositions. We could further merge SegmentTermDocs and SegmentTermPositions
into one class and deprecate the interface TermDocs.
I'm going to attach a patch once the payloads feature (LUCENE-755) is committed.
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