12. Can I plug in my own UDFs and SerDes?

Yes you can use your own user-defined functions (UDFs) and Serializer/Deserializers (SerDes). But because Qubole is a multi-tenant service, it must approve such requests on a per-account basis. Create a ticket with Qubole Support if there is a data format that is not supported or if you want to use custom UDFs.