Add first version of Cassandra connector. This plugin is still in development and is not yet bundled with the server. See the
READMEin the plugin source directory for details.
Support UDFs for internal plugins. This is not yet part of the SPI and is a stopgap feature intended for advanced users. UDFs must be implemented using the internal Presto APIs which often change substantially between releases.
Fix Hive connector semaphore release bug.
Fix handling of non-splittable files without blocks.