Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/21542
Does it make sense to compare these execution times
[thisPR](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/92746/)
and
[master](https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-maven-hadoop-2.7/5011/)
thisPR
```
4h20min building on an executor;
```
master
```
4h5min building on an executor;
```
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