Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/242#issuecomment-38880515
@pwendell agree, I was not referring to method overloading.
There is a lot of code already written which will require rewrite if
interface changes (how significant, I am not sure : but cost would be same as
Seq does today unfortunately).
I am thinking of how to minimize cost of migration compatibility.
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