Github user thunterdb commented on the issue:
https://github.com/apache/spark/pull/17419
I have added a small perf test to find the performance bottlenecks. Note
that this test works on the worst case (vectors of size 1) from the perspective
of overhead. Here are the numbers I currently get. I will profile the code to
see if there are some obvious targets for optimization:
```
[min ~ median ~ max], higher is better:
RDD = [2482 ~ 46150 ~ 48354] records / milli
dataframe (variance only) = [4217 ~ 4557 ~ 4848] records / milli
dataframe = [2887 ~ 4420 ~ 4717] records / milli
```
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