Release 0.207

Remove support for legacy JOIN ... USING behavior.
Deprecate the reorder_joins session property and the reorder-joins configuration property. They are replaced by the join_reordering_strategy session property and the optimizer.join-reordering-strategy configuration property. NONE maintains the order of the joins as written and is equivalent to reorder_joins=false. ELIMINATE_CROSS_JOINS will eliminate any unnecessary cross joins from the plan and is equivalent to . AUTOMATIC will use the new cost-based optimizer to select the best join order. To simplify migration, setting the reorder_joins session property overrides the new session and configuration properties.
Deprecate the distributed_joins session property and the distributed-joins-enabled configuration property. They are replaced by the join_distribution_type session property and the join-distribution-type configuration property. PARTITIONED turns on hash partitioned joins and is equivalent to distributed_joins-enabled=true. BROADCAST changes the join strategy to broadcast and is equivalent to . AUTOMATIC will use the new cost-based optimizer to select the best join strategy. If no statistics are available, AUTOMATIC is the same as REPARTITIONED. To simplify migration, setting the distributed_joins session property overrides the new session and configuration properties.
Add support for column properties.
Add support for char type to approx_distinct().

Security Changes

Fail on startup when configuration for file based system access control is invalid.
Add support for securing communication between cluster nodes with Kerberos authentication.

Fail on startup when configuration for file based access control is invalid.
Allow ORC files to have struct columns with missing fields. This allows the table schema to be changed without rewriting the ORC files.
Change collector for columns statistics to only consider a sample of partitions. The sample size can be changed by setting the hive.partition-statistics-sample-size property.