LiaCastaneda commented on PR #21240:
URL: https://github.com/apache/datafusion/pull/21240#issuecomment-4534990234

   👋 Hi -- while testing `datafusion-distributed `against the new `datafusion` 
release branch, we found this change breaks queries with uncorrelated 
subqueries when there's a network boundary between the `ScalarSubqueryExec` and 
the node containing the `ScalarSubqueryExpr`, because the two communicate via a 
shared `slot`, and that shared state doesn't survive between the workers. I 
left a small explanation here: 
https://github.com/datafusion-contrib/datafusion-distributed/issues/460.
   We'll work on a proper fix on our end to make distributed execution work 
with this new node, but in the meantime, would it be feasible to put this new 
planning behavior behind a session property? 


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