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Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?
• If we are changing behavior how will we phase out the older behavior?
• If we need special migration tools, describe them here.
• When will we remove the existing behavior?

Test Plan

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The proposed new DataStream API and the old API are incompatible.
The deprecation and migration plan are discussed in the umbrella FLIP.

Test Plan

Comprehensive unit tests and integration tests will be added to ensure the correctness. In addition, some old API based jobs will be selected and rewritten for verification.