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

    https://github.com/apache/flink/pull/2078#discussion_r66476461
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/api/scala/batch/table/UnionITCase.scala
 ---
    @@ -69,6 +69,36 @@ class UnionITCase(
       }
     
       @Test
    +  def testUnionAllDifferentFieldNames(): Unit = {
    --- End diff --
    
    We are trying to reduce the number of ITCases in of the Table API and only 
add new ones if necessary to keep the build time low.
    
    I would change the existing tests to use different field names instead of 
adding new tests here. In addition the tests should try to select a field to 
check that the field names of the first input are forwarded.


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