asolimando commented on PR #5031:
URL: https://github.com/apache/calcite/pull/5031#issuecomment-4893170749

   > This will need a bit more work, I found out that Presto/Trino actually 
give a different semantics to Uncollect (do not expand struct fields), so that 
needs to be modeled as well.
   
   @mihaibudiu I have been following the discussion with lots of interest but I 
missed this comment, can you elaborate a bit more on the different semantics 
you found in Trino?


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