I still have to make a test case for :

UPDATE from sub-select with derived table


mysql-test/r/multi_update.result:
  Test for found rows in multi-table update
mysql-test/r/subselect.result:
  Fix for new syntax for UNION's
mysql-test/t/multi_update.test:
  Test for found rows in multi-table update
mysql-test/t/subselect.test:
  Fix for new syntax for UNION's
sql/sql_cache.cc:
  Fix for a bug that involved derived table in sub-select in UPDATE or
  DELETE statement
sql/sql_derived.cc:
  Fix for a bug that involved derived table in sub-select in UPDATE or
  DELETE statement
sql/sql_parse.cc:
  Fix for a bug that involved derived table in sub-select in UPDATE or
  DELETE statement
sql/sql_show.cc:
  Fix for th eshow of replication status
sql/sql_yacc.yy:
  Three fixes.
  
  One for not allowing mixing of braces and non-braces in UNION's
  
  Second one for table aliases in multi-table deletes / updates
  
  Third one for using derived tables within sub-selects for 
  UPDATE / DELETE commands