Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/5942#issuecomment-100269644
This looks cool Matei. I did some basic playing around and found a case
where it looks like the job level DAG is broken. Not sure if it was added by
this patch though (ping @andrewor14 as well):
```
val df = sqlContext.jsonFile("examples/src/main/resources/people.json")
df: org.apache.spark.sql.DataFrame = [age: bigint, name: string]
scala> df.count()
res0: Long = 3
```

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