BIGINT not supported in ANSI SQL - converted to DECIMAL(18)  for
  <str>.<str>

  Explanation:   ANSI  SQL  does  not  support  a  BIGINT  (SIGNED
  QUADWORD) data type, so this definition cannot be represented in
  ANSI SQL.

  User Action:  You may decide to alter the definition so that  it
  can  be  represented  in  ANSI  SQL  or  use another language to
  extract the definition.