Github user gzm0 commented on the pull request:
https://github.com/apache/spark/pull/3262#issuecomment-63277103
I agree with @heathermiller that the implicits in the `rdd` package should
go on the `RDD` companion instead. This will not make it necessary to import
anything.
Note however, that this PR fundamentally changes the position of the
implicits that are moved: Once they are on the companion, they **cannot be
unimported**. Therefore, code that provides implicits that conflict with these
will have to explicitly call them, since the default ones cannot be unimported.
IMO this is acceptable because the moved implicits are of sufficiently general
nature. Of course this is also a source incompatibility.
Lastly, for the backward-binary compat `rddTo*` implicits, consider
forwarding to the new implicits rather than copying code (unfortunately that's
not possible for the objects).
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