Inserting None to a blob type fails silently
value has type blob
I believe this is the expected behavior. I confirmed with Philip that the table definition uses a clustering key with compact storage. I think we're seeing the issue described here: https://issues.apache.org/jira/browse/CASSANDRA-5648
Demonstration using table structure and CQL statements emitted by the driver:
This shows that inserting NULL for the value in a compact storage table does not return this row.