private List<Function> convertToFunctions(List<MFunction> mfuncs) {
    if (mfuncs == null) {
      return null;
    }
    List<Function> functions = new ArrayList<>();
    for (MFunction mfunc : mfuncs) {
      functions.add(convertToFunction(mfunc));
    }
    return functions;
  }
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