[ISSUE #855] Add the Test Util And ORC Writer for Spark

[XiaokunDing]

Add the Test Util And ORC file writer.
Lack of the metrics information and file length check.

[chenjunjiedada]

@shawnding , just left some comments for you. I think it would be better if you could run ./gradlew build before submitting your PR next time.

[XiaokunDing]

HI @rdsr , would you mind to take another look or give some advices on next steps？ thanks

[rdsr]

Thanks @shawnding . I'll try to review this today!

[rdblue]

This looks good to me, except for two things:

1. Map keys are always required if the map is projected, so I'm not sure the map change is correct.
2. I think it would make more sense to add nested tests later. The majority of these changes are test changes to add a map. I don't think the amount of change here is worth such a narrow set of cases: one string map with the same key/values each time.

[rdblue]

One more thing that I thought of: if this is adding the ability to write ORC files, then we should make sure all of the parameterized Spark tests that currently test Parquet and Avro are also applied to ORC.

[XiaokunDing]

Thanks for your suggestion @rdblue . I will append same complicated nested type to this test。And now if all of the parameter test applied to ORC file should after #199 have merged

[rdblue]

I will append same complicated nested type to this test

Sorry for the miscommunication: I'm asking you to remove the more complicated nested type from this PR. Let's get the existing tests running on ORC for this PR and then we can add more test cases in a separate one.

[XiaokunDing]

Thanks @rdblue , I was removed the nested type.would you mind to take another look or give some advices on next steps？

[rdblue]

Looks good to me. Thanks for adding this, @shawnding!