public ColStatistics getColumnStatisticsFromColName(String colName) {
    if (columnStats == null) {
      return null;
    }
    for (ColStatistics cs : columnStats.values()) {
      if (cs.getColumnName().equalsIgnoreCase(colName)) {
        return cs;
      }
    }
    return null;
  }
Statistics. Describes the output of an operator in terms of size, rows, etc
based on estimates.
ql/src/java/org/apache/hadoop/hive/ql/plan/Statistics.java