Understanding ORC file format compression

[sreejesh s]

Hi,
As per my understanding, the available codecs for ORC file format Hive table 
compression are either Zlib or Snappy.Both the compression techniques are non 
splittable.. Does it mean that any queries on Hive table stored as ORC and 
compressed will not run multiple maps in parallel ???
I know that is not correct, please help me understand what i am missing here...
Thanks