Release 0.157

General

• Fix regression that could cause queries containing scalar subqueries to fail during planning.
• Reduce CPU usage of coordinator in large, heavily loaded clusters.
• Add support for DESCRIBE OUTPUT.
• Add {func}bitwise_and_agg and {func}bitwise_or_agg aggregation functions.
• Add JMX stats for the scheduler.
• Add query.min-schedule-split-batch-size config flag to set the minimum number of splits to consider for scheduling per batch.
• Remove support for scheduling multiple tasks in the same stage on a single worker.
• Rename node-scheduler.max-pending-splits-per-node-per-stage to node-scheduler.max-pending-splits-per-task. The old name may still be used, but is deprecated and will be removed in a future version.

Hive

• Fail attempts to create tables that are bucketed on non-existent columns.
• Improve error message when trying to query tables that are bucketed on non-existent columns.
• Add support for processing partitions whose schema does not match the table schema.
• Add support for creating external Hive tables using the external_location table property.