viirya edited a comment on pull request #31296:
URL: https://github.com/apache/spark/pull/31296#issuecomment-765879991


   > Please just create an executable which prints out stdin (serialized data) 
and passes to the pipe API... I think it's the easiest way to realize.
   
   Ok, ok. I didn't like to make the pipe API take too many parameter like 
`printRDDElement`. So let me add it and create a test to take complicated type.


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