Github user fanyon commented on the issue:
https://github.com/apache/flink/pull/3812
@zhangminglei @zentol thanks for your suggestions, and I have updated the
code.
As discussed in
[https://github.com/apache/flink/pull/3750#issuecomment-298869900](url), it may
not need to register two state like the current way, and older version of the
data could be converted in some way, such as upgrade tools. I look forward to
hearing your thoughts after you think about it later. @tzulitai
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