Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3546#discussion_r106214186
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/TableEnvironment.scala
 ---
    @@ -498,6 +505,10 @@ abstract class TableEnvironment(val config: 
TableConfig) {
         TableEnvironment.validateType(inputType)
    --- End diff --
    
    Can we do the `GenericTypeInfo` type check in 
`TableEnvironment.validateType(inputType)` method? If we do so, we can remove 
the duplicate check. What do you think?
    Best,
    SunJincheng


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