Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/19657
AppVeyor still has an error
```
1. Failure: traverseParentDirs (@test_utils.R#252)
-----------------------------
`dirs` not equal to `expect`.
1/4 mismatches
x[1]: "c:\\Users\\user\\AppData\\Local\\Apache\\Spark\\Cache\\spark2.2"
y[1]: "c:/Users/user/AppData/Local/Apache/Spark/Cache/spark2.2"
```
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