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

    https://github.com/apache/carbondata/pull/1969#discussion_r170179962
  
    --- Diff: 
core/src/main/java/org/apache/carbondata/core/scan/filter/FilterUtil.java ---
    @@ -1790,6 +1790,9 @@ public static void 
removeNullValues(DimensionColumnDataChunk dimensionColumnData
       }
     
       public static void updateIndexOfColumnExpression(Expression exp, int 
dimOridnalMax) {
    +    if (exp == null) {
    +      return;
    --- End diff --
    
    add one comment to explain it can be null


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