OutputFormat<?, ?> outFormat = new OrcOutputFormat();
RecordWriter writer =
outFormat.getRecordWriter(fs, conf, testFilePath.toString(),
Reporter.NULL);
writer.write(NullWritable.get(),
serde.serialize(new NestedRow(1,2,3), inspector));
writer.write(NullWritable.get(),
serde.serialize(new NestedRow(4,5,6), inspector));
writer.write(NullWritable.get(),
serde.serialize(new NestedRow(7,8,9), inspector));
writer.close(Reporter.NULL);