User Defined Functions in Cassandra 3.0

Apache Cassandra's release 3.0 introduces User Defined Functions (UDF), allowing users to write code that runs within Cassandra daemons. UDFs are stateless and can be implemented in various languages, including Java and scripting languages with JSR-223 support. They can be used for functional indexes or aggregation. Future enhancements may include additional language support and improved user permissions.