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

    case ROWS:
      return getRows();

    case COLUMNS:
      return getColumns();

    case BINARY_COLUMNS:
      return getBinaryColumns();

    case COLUMN_COUNT:
      return getColumnCount();

    }
    throw new java.lang.IllegalStateException();
  }
Returns true if field columnCount is set (has been assigned a value) and false otherwise
service-rpc/src/gen/thrift/gen-javabean/org/apache/hive/service/rpc/thrift/TRowSet.java