The Federated storage engine used Field methods that had arbitrary limits on
  the amount of data they could process, which caused problems with data
  over that limit (4K). By removing those Field methods and just using
  features of the String class, we can avoid this problem.


mysql-test/r/federated.result:
  Add new results
mysql-test/t/federated.test:
  Add new regression test
sql/field.cc:
  Remove unnecessary methods
sql/field.h:
  Remove unnecessary methods
sql/ha_federated.cc:
  Remove use of quote_data, use String::print() to get escaping of strings,
  and don't bother with needs_quotes, just always quote values.