@Override
  public void setRootLocation(String rootLocation) throws MetaException {
    partitionSpec.setRootPath(rootLocation);
    partitionSpec.getSharedSDPartitionSpec().getSd().setLocation(rootLocation);
  }
Subclass of PartitionSpecProxy that pulls out commonality of
StorageDescriptor properties within a Partition-list into a common
StorageDescriptor instance.
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/partition/spec/PartitionSpecWithSharedSDProxy.java