@Override
  public String getToken(String tokenId) {

    LOG.debug("Begin executing getToken");
    boolean committed = false;
    MDelegationToken token;
    try{
      openTransaction();
      token = getTokenFrom(tokenId);
      if (null != token) {
        pm.retrieve(token);
      }
      committed = commitTransaction();
    } finally {
      rollbackAndCleanup(committed, null);
    }
    LOG.debug("Done executing getToken with status : {}", committed);
    return (null == token) ? null : token.getTokenStr();
  }
Get partition's column stats

@return Map of column name and its stats
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java