Github user shixiaogang commented on the issue:
https://github.com/apache/flink/pull/2768
Oh... I added another field to make the code more clear, but I did not
notice the serialization problem. Thanks very much for your reminder.
Your solution does work though the concept of "defaultValue" in folding
states is a little confusing. Another solution to let `FoldingStateDescriptor`
implement its own serialization method. And I prefer this one.
What do you think? @aljoscha
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