HeartSaVioR edited a comment on pull request #31296:
URL: https://github.com/apache/spark/pull/31296#issuecomment-765863456


   Could you please describe the actual use case? I would like to confirm this 
works with complicated schema like array/map/nested struct with some binary 
columns, and for the case how forked process can deserialize inputs properly 
and applies operations and serialize again (that wouldn't matter much as the 
return is `Dataset[String]` though).
   
   In addition, this would incur non-trivial serde cost on communication 
between Spark process and external process. Probably we also need to revisit 
which benefits this gives to us compared to what Spark provides now (UDF, or 
some others if I miss?).


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