devanbenz commented on PR #27126:
URL: https://github.com/apache/datafusion/pull/27126#issuecomment-6690544181

   > Also if there is only a single input partition we don't poll the stream 
eagerly.
   
   My assumption is that this is correct , there is nothing to merge when there 
is a single input partition so we just pass  the child stream through and just 
starts whenever the child stream starts. That being said whether the eagerness 
of the streams is a side-effect or an actual design choice is up in the air. 
   
   I'll need to look more in to the different Join operators this weekend more 
as I'm not as intimately familiar with them as I would like to be to offer much 
in the way of good suggestions. What you brought up from the [HashJoinBuffering 
operator](https://github.com/apache/datafusion/pull/27126#issuecomment-6690446935)
 is interesting though. I'll take a peak when I have some time. Let me do some 
exploratory work and I'll get back to this PR :)  
   


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