aaltay commented on pull request #15479:
URL: https://github.com/apache/beam/pull/15479#issuecomment-915736782


   I think this example is correct but I do not know if it is necessary to 
introduce this complication. Reshuffle is useful to prevent fusion. Not all 
runners do fusion (for example direct runner does not) and I am not sure how 
much this example explains why reshuffle might be needed here.


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