David Smiley created LUCENE-7500:

             Summary: Nuke Fields.java in lieu of LeafReader.getTerms(fieldName)
                 Key: LUCENE-7500
                 URL: https://issues.apache.org/jira/browse/LUCENE-7500
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: David Smiley
             Fix For: master (7.0)

{{Fields}} seems like a pointless intermediary between the {{LeafReader}} and 
{{Terms}}. Why not have {{LeafReader.getTerms(fieldName)}} instead? One loses 
the ability to get the count and iterate over indexed fields, but it's not 
clear what real use-cases are for that and such rare needs could figure that 
out with FieldInfos.

[~mikemccand] pointed out that we'd probably need to re-introduce a 
{{TermVectors}} class since TV's are row-oriented not column-oriented.  IMO 
they should be column-oriented but that'd be a separate issue.

_(p.s. I'm lacking time to do this w/i the next couple months so if someone 
else wants to tackle it then great)_

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