SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function array (children 1)
       ExpressionList (children 2)
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'1\'
          Literal \'UInt32\'
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'2\'
          Literal \'UInt32\'
      Literal \'Array(UInt64)\'
