romseygeek opened a new pull request #1440:
URL: https://github.com/apache/lucene-solr/pull/1440


   This commit adds a new class `IndexSorter` which handles how a sort should 
be applied
   to documents in an index:
   * how to serialize/deserialize sort info in the segment header
   * how to sort documents within a segment
   * how to sort documents from merging segments
   
   SortField has a `getIndexSorter()` method, which will return `null` if the 
sort cannot be used
   to sort an index (eg if it uses scores or other query-dependent values).  
This also requires a
   new Codec as there is a change to the SegmentInfoFormat


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