Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/9889#issuecomment-159473750
I wouldn't block merging an initial version of this feature on this, but it
would also be nice if we could support the following (this might be hard
though):
```scala
val f = (i: Int) => i + 1
val ds = Seq(1,2,3).toDS()
val mapped = ds.map(f)
mapped.cache()
val mapped2 = ds.map(f)
assertCached(mapped2)
```
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