Note: The proposal for this feature was withdrawn, and this patch was subsequently reverted in
HIVE-2965. This feature does not appear in any official release of Hive.
1) add region object into hive metastore
2) each partition/table has a primary region and a list of living regions, and also data location in each region
- is related to
HIVE-2965 Revert HIVE-2612