Github user jegonzal commented on the pull request:
https://github.com/apache/spark/pull/2815#issuecomment-61349425
At this point I could also imagine actually having a separate function
closure for each version.
```scala
mapTriplets(f: Edge => ED2)
mapTriplets(f: SrcEdge => ED2)
mapTriplets(f: DstEdge => ED2)
mapTriplets(f: Triplet => ED2)
```
Though to do this would require users to annotate their functions:
```scala
g.mapTriplets( (t: SrcEdge) => t.src )
```
What do you all think?
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