Hi Yurui,
This is cool, I will try to leave some comments tonight.

 Reading the JIRA it references the conversion from on-heap to off heap
memory being the performance issue.  Now that Arrow Java can point at
arbitrary memory do you know the performance delta between java-orc and
cpp-orc?  (I'm wondering if we should do something similar for parquet-cpp)

Thanks,
Micah

On Monday, May 20, 2019, Yurui Zhou <yurui....@alibaba-inc.com> wrote:

> Hi Guys:
>
> I just created a PR with WIP changes about adding JNI interface for
> reading orc files.
>
> All the major changes has been done and I would like some early feedback
> from the community.
>
> Feel free to take a look and leave your feedback.
> https://github.com/apache/arrow/pull/4348
>
> Some clean up and unit tests will be added up in follow up iterations.
>
> Thanks
> Yurui
>
>

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