docs: def unify_mp(b, partition_name):
      """Unify all of the segment partitions for a parent partition, then run stats on the MPR file"""
  
      with b.progress.start('coalesce_mp',0,message="MP coalesce {}".format(partition_name)) as ps:
          r = b.unify_partition(partition_name, None, ps)
  
      return r