Merge rkalimullin@bk-internal.mysql.com:/home/bk/mysql-5.1-maint

into  mysql.com:/home/ram/work/b26012/b26012.5.1

sql/field.h

@@ -826,6 +826,7 @@ class Field_double :public Field_real {
   uint32 pack_length() const { return sizeof(double); }
   void sql_type(String &str) const;
   uint32 max_length() { return 53; }
+  uint size_of() const { return sizeof(*this); }
 };