Github user xuchuanyin commented on a diff in the pull request:
    --- Diff: 
    @@ -16,13 +16,16 @@
     package org.apache.carbondata.processing.sort.sortdata;
     import java.util.Comparator;
      * This class is used as comparator for comparing dims which are non high 
cardinality dims.
      * Here the dims will be in form of int[] (surrogates) so directly 
comparing the integers.
    -public class NewRowComparatorForNormalDims implements Comparator<Object[]> 
    +public class NewRowComparatorForNormalDims implements 
Comparator<Object[]>, Serializable {
    +  private static final long serialVersionUID = 201803131547L;
    --- End diff --


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