linhr commented on issue #19692:
URL: https://github.com/apache/datafusion/issues/19692#issuecomment-3988185645

   > Thanks for the ping. @linhr I wouldn't be surprised if that rule has some 
bugs, it's a big complex piece of work. Could you help us by getting an MRE 
query SQL / data so we can start the process of adding the test -> figuring out 
the issue -> fixing?
   
   Thanks for following up! I haven't looked closer at the issue, but what we 
found is that by turning the `PushDownLeafProjections` optimizer rule off, the 
test failures are gone. From what we have seen, the issue is related to 
`LogicalPlan::Unnest`. The DataFusion logical plans are created 
programmatically in Sail, so it would take some time from our side to create a 
self-contained example. In the meantime, would it be possible to have some 
preliminary investigation in DataFusion?


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