Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9380#issuecomment-155970380
These SparkR support has just been added so this change breaks tests
```
1. Failure (at test_sparkSQL.R#1010): group by, agg functions
------------------
0 not equal to df3_local[df3_local$name == "Andy", ][1, 2]
NaN - 0 == NaN
2. Failure (at test_sparkSQL.R#1041): group by, agg functions
------------------
0 not equal to df7_local[df7_local$name == "ID2", ][1, 2]
NaN - 0 == NaN
```
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