Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3574
Hi @sunjincheng121, I like the idea of using `MapState` because we do not
need to deserialize and serialize the Rows when updating the state as in case
of a `ValueState` or `ListState` but just the Long timestamps to identify the
Row to retract which should be OK.
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