Additional storage engine called "blackhole". Customer request, and for that matter a Zawodny request. With this you can alter table to a type of table that would never store data. Its a /dev/null for a database.

sql/handler.h

@@ -150,6 +150,7 @@ enum db_type
   DB_TYPE_BERKELEY_DB, DB_TYPE_INNODB, 
   DB_TYPE_GEMINI, DB_TYPE_NDBCLUSTER,
   DB_TYPE_EXAMPLE_DB, DB_TYPE_ARCHIVE_DB, DB_TYPE_CSV_DB,
+  DB_TYPE_BLACKHOLE_DB,
 	       
   DB_TYPE_DEFAULT // Must be last
 };