Add configuration option hive.force-local-scheduling and session property
force_local_scheduling to force local scheduling of splits.
Add new experimental optimized RCFile reader. The reader can be enabled by
setting the configuration option hive.optimized-reader.enabled or session
property optimized_reader_enabled.
General Changes
Add support for UNNEST, which can be used as a replacement for the explode() function in Hive.
Fix a bug in the scan operator that can cause data to be missed. It currently only affects queries
over information_schema or sys tables, metadata queries such as SHOWPARTITIONS and connectors
that implement the ConnectorPageSource interface.