public void setBucketVersion() {
      for (Operator<?> operator : members) {
        operator.getConf().setBucketingVersion(version);
        LOG.debug("Bucketing version for {} is set to {}", operator, version);
      }
    }
A Group of operators which must have the same bucketing version.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/BucketVersionPopulator.java