Merge mysql.com:/home/hf/work/30638/my50-30638

into  mysql.com:/home/hf/work/30638/my51-30638


sql/sql_select.cc:
  Auto merged
sql/sql_update.cc:
  Auto merged
storage/innobase/handler/ha_innodb.cc:
  Auto merged
storage/myisam/ha_myisam.cc:
  Auto merged
storage/myisam/mi_write.c:
  Auto merged
storage/myisam/sort.c:
  Auto merged
sql/opt_range.cc:
  merging
sql/sql_map.cc:
  merging
storage/federated/ha_federated.cc:
  merging
storage/heap/ha_heap.cc:
  merging