public boolean isSet(_Fields field) {
    if (field == null) {
      throw new java.lang.IllegalArgumentException();
    }

    switch (field) {
    case IS_TBL_LEVEL:
      return isSetIsTblLevel();
    case DB_NAME:
      return isSetDbName();
    case TABLE_NAME:
      return isSetTableName();
    case PART_NAME:
      return isSetPartName();
    case LAST_ANALYZED:
      return isSetLastAnalyzed();
    case CAT_NAME:
      return isSetCatName();
    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
standalone-metastore/metastore-common/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/metastore/api/ColumnStatisticsDesc.java