Adrien Grand created LUCENE-4871:
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             Summary: Sorter API: better compress positions, offsets and 
payloads in SortingDocsAndPositionsEnum
                 Key: LUCENE-4871
                 URL: https://issues.apache.org/jira/browse/LUCENE-4871
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
            Priority: Trivial
             Fix For: 4.3


SortingDocsAndPositionsEnum could easily save memory by using a 
Lucene40TCF-like compression method for positions, offsets and payloads:
 - delta-encode positions and startOffsets (with the previous end offset),
 - store the length of the tokens instead of their end offset (endOffset == 
startOffset + length),
 - use a single bit to say whether the token has a payload.

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