Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9651#issuecomment-156035099
Seems that this PR breaks another existing feature, namely explicitly
specifying a subset of partitions. E.g.:
```scala
sqlContext.read.parquet("base/p1=a/p2=1", "base/p1=a/p2=2")
sqlContext.read.parquet("base/year=201?/month=10")
```
In the second case, the the glob pattern is expanded into multiple input
paths. And these paths are considered to be root paths, which prevents
partition discovery.
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