SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Function makeDate32 (children 1)
       ExpressionList (children 3)
        Literal UInt64_1991
        Literal UInt64_8
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal UInt64_24
          Literal \'Nullable(UInt64)\'