baiguoname commented on issue #18202:
URL: https://github.com/apache/datafusion/issues/18202#issuecomment-3459168176

   > Unfortunately, as far as I know there is no easy way to tell and we don't 
have enough documentation in this field. However, as you observed if a plan 
passes from `SanityCheckPlan ` when sources are unbounded, there shouldn't be 
no pipeline breaking operator within the final plan (I guess, this is true for 
your case. I imagine you didn't get any error from `SanityCheckPlan` rule). 
However, I cannot understand why you don't see any result during execution.
   
   Yes, I didn't get any error from `SanityCheckPan`. I didn't have a chance to 
see if I could get any result during execution; it threw the error `Task 
canceled` right after I ran it. I guess the problem is in the way I provided 
the unbounded data. I'm going to check that in more detail.


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