Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/4042#issuecomment-70390485
I'd actually prefer not to have this in Spark. It's not really clear what
we will do with an `Any`, and the user can really easily just call `toString`
explicitly. I also looked at two other similar constructs in Java (the Java
Properties class and Hadoop's Configuration class) and none of them offer this
type of interface. There are multiple language API's that have this `setConf`
and they all require string keys and values, it's just a bit inconsistent to do
this kind of implicit conversion.
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