Github user holdenk commented on the pull request:
https://github.com/apache/spark/pull/12529#issuecomment-212574884
Minor nit: Maybe s/omissive/missing/ for clarity while reading the title?
If all of our Params use type converter, maybe we should remove the default
param of none and expected type for 2.0 - the docs mention keeping expected
type until 2.1 but that seems maybe a bit longer than necessary if we've
completely switched all of our internal types over and while the Params API is
technically public I think requiring an explicit type converter specified would
be a reasonable change for the 2.0 time frame. Just a thought, what do @sethah
& @jkbradley think?
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