Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/19657
I actually took a look to decrease the build time (as you know) and am
currently away from it. If I remember correctly, what I observed was that a
single particular test(?) takes 20ish(?) mins. It was related with ML in R.
Let me try to take a look again first and will leave some comments about
what I investigated in SPARK-21693 if I can't deal with it by myself (probably
by my limited ML knowledge).
If that's actually not that quite simple, then, let me ask it to increase 2
hours (like my own account).
In AppVeyor, sounds they actually recommend to separate the build, as I
proposed in the JIRA or reduce the time ..
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