rluvaton opened a new pull request, #23761:
URL: https://github.com/apache/datafusion/pull/23761

   **Note: we still need to add back the timers back**
   
   ## Which issue does this PR close?
   
   N/A
   
   ## Rationale for this change
   
   SortMergeJoin bitwise stream implementation is very complex and hard to 
understand while on paper it should be pretty simple.
   
   the reason for that is we have to store state between polls (we had 
`boundary`) and handle the case where both can get `Poll::Pending` from child 
and `Poll::Ready` from child which further complicate the code
   
   ## What changes are included in this PR?
   
   1. Move to async generators
   2. Rewrote main loop to be textbook like as possible
   
   ## Are these changes tested?
   existing tests
   
   ## Are there any user-facing changes?
   no


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