@org.apache.thrift.annotation.Nullable
    public static _Fields findByThriftId(int fieldId) {
      switch(fieldId) {
        case 1: // REGION_NAME
          return REGION_NAME;
        case 2: // CLIENT_ADDRESS
          return CLIENT_ADDRESS;
        case 3: // TABLE_NAME
          return TABLE_NAME;
        case 4: // USER_NAME
          return USER_NAME;
        case 5: // LIMIT
          return LIMIT;
        case 6: // LOG_TYPE
          return LOG_TYPE;
        case 7: // FILTER_BY_OPERATOR
          return FILTER_BY_OPERATOR;
        default:
          return null;
      }
    }
Find the _Fields constant that matches fieldId, or null if its not found.
hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift2/generated/TLogQueryFilter.java