Github user tzulitai commented on the issue:
https://github.com/apache/flink/pull/2225
Just realized that the `byte[] recordKey` and `String partitionKey` are
actually the same only in different form, so now we have duplicate info in the
deser schema. I think we can keep the `String` one, since it's the type we get
from AWS API for the key. Opening a hotfix for this.
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