THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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For these two options, there is a common limitation, which is the number of splits should not be larger than the number of key groups. Because finally, we want to build a mapping from a split to a key group to ensure correctness during rescaling.
Compatibility, Deprecation, and Migration Plan
This improvement is compatible and will not impact existing users.
Test Plan
Additional unit tests will be added to test if the API works well when the input streaming is "Pre-KeyedStream".
Rejected Alternatives
No option is rejected yey.