SparkApplicationMaster commented on PR #17456:
URL: https://github.com/apache/datafusion/pull/17456#issuecomment-3263235043

   Some caveats:
   1) Tried to implement type signature like this:
   ```rust
   Signature::arrays(2, Some(ListCoercion::FixedSizedListToList), 
Volatility::Immutable)
   ```
   but it coerces list field to same type which is not acceptable for this 
function
   
   2) This function requres to be confugurable, but this is not implemented yet 
in datafusion as I know
   Keys can be deduplicated or an error can be raised according to spark-conf
   So by default a more permissive deduplicating  behaviour is implemented, as 
it is more useful and passes spark-tests
   TODO added where the future work needed when configuration will be possible


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