Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/80#issuecomment-37054161
@ScrapCodes I think the original scaladoc explains that this performs a
shuffle, but you didn't copy this code in any of the python/java docs. Would
you mind adding that? It's sort of important because otherwise people could
think this is a cheap operation.
```
/**
* Return the intersection of this RDD and another one. The output will
not contain any duplicate
* elements, even if the input RDDs did.
*
* Note that this method performs a shuffle internally.
*/
```
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