Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4702
@aljoscha @chenqin Hi guys, can you please take a look? I'll write doc
about this feature with
[FLINK-7660](https://issues.apache.org/jira/browse/FLINK-7660). BTW, this is
my first time writing Scala---
