SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier res
    Function if (alias res) (children 1)
     ExpressionList (children 3)
      Literal UInt64_1
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal Array_[UInt64_1, UInt64_2, UInt64_3]
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'str_1\'
        Literal \'Nullable(String)\'
