saadtajwar opened a new pull request, #24681:
URL: https://github.com/apache/datafusion/pull/24681

   ## Which issue does this PR close?
   
   - Part 1 (of 2) of #24584
   
   ## Rationale for this change
   
   NestedLoopJoin is basically two separate streams currently - one for regular 
joins and one for semi/anti/mark (SAM) joins. We would like to both split these 
out to separate streams, and make both of the streams simpler by using the 
async generator pattern to remove the polling and state machinery 
   
   ## What changes are included in this PR?
   
   - Moved SAM joins to a separate stream
   - Stream for SAM joins now using the async generator pattern without the 
polling & state machinery
   - Created a shared file for helpers that are being used by both streams 
(`JoinLeftData` & associated methods, `SpillState` & associated methods, 
utility functions)
   - Moved
   
   
   ## Are these changes tested?
   
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   ## Are there any user-facing changes?
   
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