Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/21121
I'm not sure we really need this function.
If the purpose is only for `transform` function you mentionsed at
https://github.com/apache/spark/pull/21121#issuecomment-383319312, how about
adding a second parameter to `transform` to pass the index? It would seem
higher performance because we don't need to materialize the struct.
It's also up to @hvanhovell who I believe is working on `transform`, so I'd
like to wait for his opinion as well.
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