Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9383#issuecomment-153482419
@JoshRosen The cause is that if the buffer is an empty one (e.g. we do not
have agg function or all agg functions do not use any buffer slot), the
initialInputBufferOffset is still 0 and when the key is a string, the following
code will trigger the exception. Unfortunately, our test only use int columns
as the key columns.
```
newMutableProjection(
originalInputAttributes.drop(initialInputBufferOffset),
originalInputAttributes)()
```
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