@Override
      protected AggrStats getSqlResult(GetHelper<AggrStats> ctx)
          throws MetaException {
        return directSql.aggrColStatsForPartitions(catName, dbName, tblName, partNames,
            colNames, engine, useDensityFunctionForNDVEstimation, ndvTuner, enableBitVector, enableKll);
      }
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