default TaskWriter<RowData> createTaskWriter(
      MixedTable mixedTable, RowType rowType, boolean overwrite, long mask) {
    MixedFormatRowDataTaskWriterFactory taskWriterFactory =
        new MixedFormatRowDataTaskWriterFactory(mixedTable, rowType, overwrite);
    taskWriterFactory.setMask(mask);
    taskWriterFactory.initialize(0, 0);
    return taskWriterFactory.create();
  }
This class contains flink table rowType schema and others, and will replace {@link FlinkTestBase}
base class in the future.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/test/java/org/apache/amoro/flink/FlinkTableTestBase.java