Github user NarineK commented on the issue:
https://github.com/apache/spark/pull/14431
I think 'prepend' sounds better. What do you think ?
Yes, the `key` in `function(key, x) { x }` can be useful for some use cases
but I also think that the user could easily prepend it to the dataframe if
he/she needs it and since the `key` is already there.
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