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

    https://github.com/apache/flink/pull/4842#discussion_r145260250
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/table/api/stream/table/CorrelateTest.scala
 ---
    @@ -99,6 +104,21 @@ class CorrelateTest extends TableTestBase {
         util.verifyTable(result, expected)
       }
     
    +  /**
    +    * Due to the improper translation of TableFunction left outer join 
(see CALCITE-2004), the
    +    * join predicates can only be empty or literal true.
    +    */
    +  @Test (expected = classOf[ValidationException])
    --- End diff --
    
    move this test method to `validate.CorrelateValidationTest`.


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