Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15789
I'll merge if there are no further comments. To restate -- basically the
test helper function returns a path that is perfectly fine for reading test
data, and is flexible because it doesn't depend on what the current working dir
is. However it won't work as a location to write to, which is only rarely ever
needed like in cases like this.
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