alamb commented on issue #9016:
URL: 
https://github.com/apache/arrow-datafusion/issues/9016#issuecomment-1934109580

   > : Is there any trick out there for watermarking, that is, a way for a 
table to emit a signal that all events at a given event time have been sent?
   
   The way most of the code in DataFusion works is that it will use the next 
distinct value in the data to trigger emission (as in you have to see an event 
of the next time)
   
   I don't know of any way to send a synthetic signal that says "will never see 
any more values in this time interval"


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