default AggrStats getAggrColStatsFor(org.apache.hadoop.hive.ql.metadata.Table table, List<String> colNames, 
        List<String> partNames) throws MetaException {
    return null;
  }
Returns an aggregated column statistics for the supplied partition list
@param table table object
@param colNames list of column names
@param partNames list of partition names
@return AggrStats object
ql/src/java/org/apache/hadoop/hive/ql/metadata/HiveStorageHandler.java