Hello everyone,

Is there any documentation on the implication of name param when applying a 
PTransform on PCollection? Some questions I have on mind is

Is the name required to be unique across the pipeline?
For stateful PTransforms such as stateful ParDo, Combine and Window, if no name 
is provided, is state preserved during upgrades?
If a stable name is provided,  is state preserved during upgrades?
If a stable name is provided and changed intentionally during upgrade, is state 
expected to be clearer?

Thanks,
Ke


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