Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/10685#issuecomment-171114404
```
1. In many cases for type bounds, ti is good to have a space before the
colon so it is more clear.
2. For type descriptions (e.g. variable : Int), it is also often useful to
have a space.
```
It exactly make sense. O.K, let's check style violation only for comma.
Only the change for SQL is reverted for now so would you like me to revert
the rest of the changes?
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