SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Literal UInt64_1 (alias x)
    Literal Tuple_(UInt64_1, UInt64_2, UInt64_3) (alias y)
    Function in (children 1)
     ExpressionList (children 2)
      Identifier x
      Identifier y