TAJO-1400: Add TajoStatement::setMaxRows method support

[hys9958]

I implemented the setMaxRows and getMaxRows method support.
Please review my patch.

thanks.

[blrunner]

Thank you for your contribution.
I'll review the patch today. :)

[jihoonson]

Would you add some unit tests?
TestTajoJDBC will be good to add tests.

[hys9958]

Ok, jihoonson,
I'll update the TestTajoJDBC for unit tests of this issue soon.

[jihoonson]

+1
Thanks for your contribution!

[jinossy]

@hys9958
How do you think that move the setMaxRows() to TajoStatement ?

[jihoonson]

@jinossy thanks for the good suggestion.
It would be a better implementation.

[hys9958]

@jinossy Ok, It's better idea.
I'll re-patch the implementation of maxRows(). :)

[jihoonson]

@hys9958 thanks. I'll wait for the next patch.

[hys9958]

Hi @jihoonson ,
Query return value is 'java.sql.ResultSet' interfase in TajoStatement. It need to many refactoring.
And i'll also another patch about getMoreResults. When the getMoreResults patch time, i update maxRows.

[jihoonson]

Ok. Here is my +1.
If there are no objections, I'll commit.