adriangb commented on issue #17451:
URL: https://github.com/apache/datafusion/issues/17451#issuecomment-3262036211

   > Without some synchronization, the behavior is racy and it's not guaranteed 
that that the dynamic filter is built prior to initiating the right side's 
execution plan.
   
   I think that's fine? For a big query it will be a non issue. It could make a 
difference in a small query. My worry is that if you get synchronization wrong 
or misunderstand something you can actually slow things down, end up with 
deadlocks, etc.


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