Github user massie commented on the pull request:
https://github.com/apache/spark/pull/7403#issuecomment-139340910
@andrewor14 I agree the name `combineByKeyWithClassTag` is awkward. I'm
open to changing it to a less awkward name, if you or anyone else can suggest
one.
We can't make the `combineByKeyWithClassTag` methods `private`, since
developers may want to use them directly (as they can with the `combineByKey`
methods), although most likely use the higher-level methods.
I hope that in Spark 2.0, when we're able to fix this API, we can simply
add the `ClassTag` to `combineByKey` and have no need for the `*withClassTag`
methods.
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