public static boolean canColumnStatsMerge(Map<String, String> params, String colName) {
    if (params == null) {
      return false;
    }
    // TODO: should this also check that the basic flag is valid?
    ColumnStatsAccurate stats = parseStatsAcc(params.get(COLUMN_STATS_ACCURATE));
    return stats.columnStats.containsKey(colName);
  }
@param params table/partition parameters
@return the list of column names for which the stats are available.
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/common/StatsSetupConst.java