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

    https://github.com/apache/flink/pull/2870#discussion_r103962015
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
 ---
    @@ -150,7 +150,35 @@ class Table(
         * }}}
         */
       def filter(predicate: Expression): Table = {
    -    new Table(tableEnv, Filter(predicate, logicalPlan).validate(tableEnv))
    +
    +    predicate match {
    --- End diff --
    
    The IN operator can also be used in a `select()` statement but if we do the 
translation here, only `filter()` is supported.


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