Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/10712#issuecomment-170767813
I guess I figured out why. IntelliJ import organizer thinks that `{` is
greater than alphabetic characters while the Scala style checker thinks the
opposite. So the following imports
```scala
import a.b.C
import a.b.{D, E}
```
must be reordered into
```scala
import a.b.{D, E}
import a.b.c
```
Let me see whether I can configure the behavior of IntelliJ.
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