update a record which does not exists

[Peng Xiao]

Dear All,If we update a record which actually does not exist in Cassandra,will 
it generate a new record or exit?


UPDATE columnfamily SET data = 'test data' WHERE key = 'row1';

as in CQL Update and insert are semantically the same.Could anyone please 
advise?


Thanks,
Peng Xiao