Github user kumarvishal09 commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/2170#discussion_r181758974
  
    --- Diff: 
integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/preaaggregate/PreAggregateTableHelper.scala
 ---
    @@ -76,7 +76,8 @@ case class PreAggregateTableHelper(
         val partitionerFields = fieldRelationMap.collect {
           case (field, dataMapField) if parentPartitionColumns
             .exists(parentCol =>
    -          
parentCol.equals(dataMapField.columnTableRelationList.get.head.parentColumnName)
 &&
    +          dataMapField.columnTableRelationList.getOrElse(Seq()).nonEmpty &&
    --- End diff --
    
    Please add comment 


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