Hisoka-X commented on issue #2274:
URL: 
https://github.com/apache/incubator-seatunnel/issues/2274#issuecomment-1197940156

   > @EricJoy2048 Now how do we deal with the union of multiple upstream 
operators? That's the same thing as the following <img alt="image" width="343" 
src="https://user-images.githubusercontent.com/36807946/181452486-e150e98c-7af7-425c-8afd-e53752677c99.png";>
 Users need `union (all)` post-processing, and we cannot separate them
   
   We should create a special transform `union`. It can union all upstream 
data. Then `union` will have parallelism parameter, take this picture as an 
example, if parallelism = 8 (4+4), just send data to next action, if 
parallelism != 8, we should use queue( like Partition Transform) to change 
parallelism.


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