Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1039#issuecomment-45677035
Hey @GregOwen a couple thoughts.
1. If you run this in the spark shell you'll get examples than from within
the unit test harness. The issue is that the code we use to detect the "call
site" of the RDD (the user function that called it) gets messed up when running
unit tests because they are within the spark package.
2. I might slightly prefer adding `+` icons next to the main RDD. /cc @rxin
also who might have some thoughts on this.
```
(5) + FlatMappedValuesRDD[321] at apply at Transformer.scala:22
| MappedValuesRDD[320] at apply at Transformer.scala:22
| CoGroupedRDD[319] at apply at Transformer.scala:22
(4) + MappedRDD[318] at apply at Transformer.scala:22
| MappedRDD[316] at apply at Transformer.scala:22
| ParallelCollectionRDD[314] at apply at Transformer.scala:22
(5) + MappedRDD[317] at apply at Transformer.scala:22
| ParallelCollectionRDD[315] at apply at Transformer.scala:22
(6) + MappedRDD[317] at apply at Transformer.scala:22
```
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