Improve visibility of blocked and reserved query states.
Lots of minor improvements.
JDBC Driver Changes
Allow escaping in DatabaseMetaData patterns.
Hive Changes
Fix write operations for ViewFileSystem by using a relative location.
Remove support for the hive-cdh4 and hive-hadoop1 connectors which
support CDH 4 and Hadoop 1.x, respectively.
Remove the hive-cdh5 connector as an alias for hive-hadoop2.
Remove support for the legacy S3 block-based file system.
Add support for KMS-managed keys for S3 server-side encryption.
Cassandra Changes
Add support for Cassandra 3.x by removing the deprecated Thrift interface used to
connect to Cassandra. The following config options are now defunct and must be removed:
cassandra.thrift-port, cassandra.thrift-connection-factory-class,
cassandra.transport-factory-options and cassandra.partitioner.
SPI Changes
Add methods to SystemAccessControl and ConnectorAccessControl to
filter the list of catalogs, schemas and tables.