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

    https://github.com/apache/flink/pull/4488#discussion_r131764752
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/calcite/RelTimeIndicatorConverter.scala
 ---
    @@ -415,7 +406,13 @@ class RexTimeIndicatorMaterializer(
           case _ =>
             updatedCall.getOperands.map { o =>
               if (isTimeIndicatorType(o.getType)) {
    -            rexBuilder.makeCall(TimeMaterializationSqlFunction, o)
    +            if (isRowtimeIndicatorType(o.getType)) {
    --- End diff --
    
    Not sure. The duplicated code is spread over 2 classes and differently 
parameterized. I tried to add a companion object to 
`RexTimeIndicatorMaterializer` and the method but this did not really improve 
the code, IMO.


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