[jira] [Created] (CASSANDRA-9409) Ensure that UDF and UDAs are keyspace-isolated

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-9409:
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             Summary: Ensure that UDF and UDAs are keyspace-isolated
                 Key: CASSANDRA-9409
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9409
             Project: Cassandra
          Issue Type: Bug
            Reporter: Aleksey Yeschenko
            Assignee: Robert Stupp
             Fix For: 2.2 rc1


In table columns we don't allow to use UDTs from other keyspaces.

We should also make sure that the following is *not* allowed:
- UDFs taking UDTs from other keyspaces as arguments or return types
- UDAs using UDFs as its subfunctions

The only exception should be made for {{system}} keyspace. UDAs and UDFs from any keyspace should be able to reference and reuse those.

Having no dependencies between keyspaces makes this consistent with the way we treat UDTs, which is important, but also simplifies auth in multi-tenant environments, and is also crucial to upcoming 3.X strongly consistent schema work (the ability to treat keyspace as a unit of change and not having to worry about cross-keyspace dependencies).

P.S. Should *probably* still allow using other keyspaces UDFs and UDAs in {{SELECT}} statements. Strict isolation in schema dependencies is what matters to me here.



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