Github user xuchuanyin commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/2425#discussion_r200813333
  
    --- Diff: 
integration/spark2/src/main/scala/org/apache/carbondata/datamap/IndexDataMapRebuildRDD.scala
 ---
    @@ -144,13 +148,113 @@ class OriginalReadSupport(dataTypes: 
Array[DataType]) extends CarbonReadSupport[
       }
     }
     
    +/**
    + * This class will generate row value which is raw bytes for the 
dimensions.
    + */
    +class RawBytesReadSupport(segmentProperties: SegmentProperties, 
indexColumns: Array[CarbonColumn])
    --- End diff --
    
    besides, currently I can not find a readsupport that in module carbon-core, 
so better to leave it where it is needed.
    
    
![image](https://user-images.githubusercontent.com/10445758/42411659-17c802f2-8232-11e8-8f43-cbb70b305427.png)



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