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

    https://github.com/apache/flink/pull/2870#discussion_r105244663
  
    --- 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 --
    
    @twalthr Unfortunately, add support for POJO and tuples as a standard types 
of data in table API is too complicated task and out of scope this task. Adding 
of new composite types to API more wide than add IN operator, it will impact 
all process of validation and execution of SQL statements. It would be better 
create epic for introduce new types.
    I have researched it and I think I would be better commit IN operator 
functionality without support tuples and POJOs. Otherwise, It would become 
infinite task.


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