Github user rowan000 commented on the pull request:
https://github.com/apache/spark/pull/6259#issuecomment-105479474
I think for reasonable sized N, the map implementation will be considerably
more efficient. I added some information on the jira. For small N, the map
carries a small setup cost - but it is very small. To keep things simple I use
the map implementation regardless. However you could use the map implementation
only when N is greater than a certain threshold. I'm not convinced it requires
that extra complexity.
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