@org.apache.thrift.annotation.Nullable
  public java.lang.Object getFieldValue(_Fields field) {
    switch (field) {
    case REGION_NAME:
      return getRegionName();

    case CLIENT_ADDRESS:
      return getClientAddress();

    case TABLE_NAME:
      return getTableName();

    case USER_NAME:
      return getUserName();

    case LIMIT:
      return getLimit();

    case LOG_TYPE:
      return getLogType();

    case FILTER_BY_OPERATOR:
      return getFilterByOperator();

    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field filterByOperator is set (has been assigned a value) and false otherwise
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TLogQueryFilter.java