Github user avulanov commented on the pull request:
https://github.com/apache/spark/pull/4152#issuecomment-71515894
@jkbradley +1 for more generic `Datum` type. There are two links to Scala
type conversion benchmarks in the answer to
http://stackoverflow.com/questions/18083696/generic-type-class-instances-performance.
As far as I understand, it will not be a big overhead, especially comparing to
the code that contains algorithm's implementation.
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