Add offsets to postings (D&PEnum)
---------------------------------

                 Key: LUCENE-3684
                 URL: https://issues.apache.org/jira/browse/LUCENE-3684
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 4.0


I think should explore making start/end offsets a first-class attr in the
postings APIs, and fixing the indexer to index them into postings.

This will make term vector access cleaner (we now have to jump through
hoops w/ non-first-class offset attr).  It can also enable efficient
highlighting without term vectors / reanalyzing, if the app indexes
offsets into the postings.


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