Hi Xingbo,

Thanks a lot for bringing up the discussion. Looks good from my side.
One suggestion beyond the document: it would be nice to avoid Scala code in
the flink-table module since we would like to get rid of Scala in the
long-term[1][2].

Best, Hequn

[1]
https://cwiki.apache.org/confluence/display/FLINK/FLIP-28%3A+Long-term+goal+of+making+flink-table+Scala-free
[2] https://flink.apache.org/contributing/code-style-and-quality-scala.html


On Tue, Feb 4, 2020 at 9:09 PM jincheng sun <sunjincheng...@gmail.com>
wrote:

> Thanks for bring up this discussion Xingbo!
>
> The the design is pretty nice for me! This feature is really need which
> mentioned in FLIP-58. So, I think is better to create the JIRA and open the
> PR, then more detail can be reviewed. :)
>
> Best,
> Jincheng
>
>
>
> Xingbo Huang <hxbks...@gmail.com> 于2020年2月3日周一 下午3:02写道:
>
> > Hi all,
> >
> > The scalar Python UDF has already been supported in coming release of
> 1.10,
> > we’d like to introduce Python UDTF now. FLIP-58[1] has already introduced
> > some content about Python UDTF. However, the implementation details are
> > still not touched. I have drafted a design doc[2]. It includes the
> > following items:
> >
> > - How to define Python UDTF.
> >
> > - The introduced rules for Python UDTF.
> >
> > - How to execute Python UDTF.
> >
> > Because the implementation relies on Beam's portability framework for
> > Python user-defined table function execution and not all the contributors
> > are familiar with it, I have done a prototype[3].
> >
> > Welcome any feedback.
> >
> > Best,
> >
> > Xingbo
> >
> > [1]
> >
> >
> https://cwiki.apache.org/confluence/display/FLINK/FLIP-58%3A+Flink+Python+User-Defined+Stateless+Function+for+Table
> >
> > [2]
> >
> >
> https://docs.google.com/document/d/1Pkv5S0geoYQ2ySS5YTTBivJ3hoi-uzLXVQkDVIaR0cE/edit#heading=h.pzeztvig3kg1
> > [3] https://github.com/HuangXingBo/flink/commits/FLINK-UDTF
> >
>

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