Github user chenliang613 commented on a diff in the pull request:

    https://github.com/apache/carbondata/pull/2334#discussion_r197669862
  
    --- Diff: 
integration/presto/src/main/java/org/apache/carbondata/presto/PrestoFilterUtil.java
 ---
    @@ -171,134 +170,89 @@ else if 
(colType.equals(DecimalType.createDecimalType(carbondataColumnHandle.get
        * @return
        */
       static Expression parseFilterExpression(TupleDomain<ColumnHandle> 
originalConstraint) {
    -    ImmutableList.Builder<Expression> filters = ImmutableList.builder();
     
         Domain domain;
    +    Expression finalFilters = null;
    --- End diff --
    
    Can you provide comments to explain the below Expression?  and why 
colExpression need put "final"?
    
    Expression finalFilters = null;
    final Expression colExpression = new ColumnExpression(cdch.getColumnName(), 
coltype);
    Expression colValueExpression = null;
    Expression rangeExpression = null;


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