Github user willb commented on the pull request:
https://github.com/apache/spark/pull/2768#issuecomment-58893902
Two open questions, and the latter is more relevant: is requiring that
actuals are casted to the types of formals too restrictive? Is it likely to
lead to type-coercion rules oscillating? (Obviously, it should be possible to
pass, e.g., a value of a narrow numeric type where a wider one is expected.
But if all the type-coercion rules we can anticipate ultimately widen types or
convert from strings into other values, then the rules will still make
progress.)
(cc @marmbrus)
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