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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15896995#comment-15896995
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ASF GitHub Bot commented on FLINK-4565:
---------------------------------------

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

    https://github.com/apache/flink/pull/2870#discussion_r104375934
  
    --- Diff: 
flink-libraries/flink-table/src/test/scala/org/apache/flink/api/table/expressions/ScalarFunctionsTest.scala
 ---
    @@ -1101,6 +1101,45 @@ class ScalarFunctionsTest extends ExpressionTestBase 
{
           "true")
       }
     
    +  @Test
    +  def testInExpressions(): Unit = {
    +    testTableApi(
    --- End diff --
    
    You are right, working with POJOs and Case classes does not always give you 
best performance but limiting the number of supported types results in bad user 
experience. Types that are supported in general, should also be supported by 
features. Why can't we use POJOs in SQL? Is `f4 IN (f3, f2, f0)` not possible?


> Support for SQL IN operator
> ---------------------------
>
>                 Key: FLINK-4565
>                 URL: https://issues.apache.org/jira/browse/FLINK-4565
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Dmytro Shkvyra
>
> It seems that Flink SQL supports the uncorrelated sub-query IN operator. But 
> it should also be available in the Table API and tested.



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