bool Field_timestampf::is_max()
{
  DBUG_ENTER("Field_timestampf::is_max");
  ASSERT_COLUMN_MARKED_FOR_READ;

  DBUG_RETURN(mi_sint4korr(ptr) == TIMESTAMP_MAX_VALUE &&
              mi_sint3korr(ptr + 4) == TIME_MAX_SECOND_PART);
}
bool Field_timestampf::is_max()
{
  DBUG_ENTER("Field_timestampf::is_max");
  ASSERT_COLUMN_MARKED_FOR_READ;

  DBUG_RETURN(mi_sint4korr(ptr) == TIMESTAMP_MAX_VALUE &&
              mi_sint3korr(ptr + 4) == TIME_MAX_SECOND_PART);
}