CQL / ASSUME for keys

[Alain RODRIGUEZ]

Hi,

I'm trying to do the following : update keyspace.CF set '2' = '2' + 12
WHERE KEY = 'mykey';
And got this answer            : "Bad Request: cannot parse 'mykey' as
hex bytes"

Using this doesn't help        : "assume keyspace.CF(KEY) VALUES ARE
text; (Found here
http://www.datastax.com/docs/1.0/references/cql/ASSUME and I'm using
C* 1.0.9)

Show schema in cli gives :

create column family CF
  with column_type = 'Standard'
  and comparator = 'UTF8Type'
  and default_validation_class = 'CounterColumnType'
  and key_validation_class = 'BytesType'
  and rows_cached = 0.0
  and row_cache_save_period = 0
  and row_cache_keys_to_save = 2147483647
  and keys_cached = 2000.0
  and key_cache_save_period = 14400
  and read_repair_chance = 1.0
  and gc_grace = 864000
  and min_compaction_threshold = 4
  and max_compaction_threshold = 32
  and replicate_on_write = true
  and row_cache_provider = 'ConcurrentLinkedHashCacheProvider'
  and compaction_strategy =
'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy';

What would be the consequences of changing the key_validation_class
from 'BytesType' to 'UTF8Type'  (in production)?

Shouldn't my assume command allow me to update my data even if I don't
give the key as Bytes ?

Alain