Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12067#issuecomment-206894556
the benchmark result of master branch is extremely slow:
```
aggregate: Best/Avg Time(ms) Rate(M/s) Per
Row(ns) Relative
-------------------------------------------------------------------------------------------
DataFrame sum 117 / 262 85.7
11.7 1.0X
Dataset sum using Aggregator 177126 / 178618 0.1
17712.6 0.0X
Dataset complex Aggregator 359263 / 360736 0.0
35926.3 0.0X
```
not sure why...
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