Renaud Delbru created LUCENE-4018:
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             Summary: Make accessible subenums in MappingMultiDocsEnum
                 Key: LUCENE-4018
                 URL: https://issues.apache.org/jira/browse/LUCENE-4018
             Project: Lucene - Java
          Issue Type: Improvement
          Components: core/codecs
    Affects Versions: 4.0
            Reporter: Renaud Delbru
             Fix For: 4.0
         Attachments: LUCENE-4018.patch

The #merge method of the PostingsConsumer receives MappingMultiDocsEnum and 
MappingMultiDocsAndPositionsEnum as postings enum. In certain case (with 
specific postings formats), the #merge method needs to be overwritten, and the 
underlying DocsEnums wrapped by the MappingMultiDocsEnum need to be accessed.

The MappingMultiDocsEnum class should provide a method #getSubs similarly to 
MultiDocsEnum class.

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