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_0
      Literal Array_[UInt64_1, UInt64_2, UInt64_3]
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'str_1\'
        Literal \'Nullable(String)\'
