Add TODO to consider unifying rewrite logic for range and between exp…

…ressions

pinot-core/src/main/java/org/apache/pinot/core/query/optimizer/filter/NumericalFilterOptimizer.java

@@ -366,6 +366,7 @@ private static Expression rewriteRangeExpression(Expression range, FilterKind ki
    * datatype as the column (or can be cast to the same datatype in the server).
    */
   private static Expression rewriteBetweenExpression(Expression between, DataType dataType) {
+    // TODO: Consider unifying logic with rewriteRangeExpression
     List<Expression> operands = between.getFunctionCall().getOperands();
     Expression lower = operands.get(1);
     Expression upper = operands.get(2);