CASSANDRA-6717 will not be part of Cassandra 2.2, my comment there got to be considered for the current system.schema_functions table, to avoid creating a special case just for 2.2:
Builtin CQL functions are not described in the system keyspace in its current representation, this new schema should include them next to the user defined ones as:
- The system keyspace and its tables are described in the system keyspace, therefore it would be consistent.
- Having builtin CQL functions described there would allow external tools to manipulate all the functions in a similar way.
- This would document the available builtin function for users that don't remember the ones available in their current version of Cassandra.