Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21057
It would be helpful if you open a JIRA and describe the issue. It could
help other guys think a better way to test or would give clearer ideas to see
if it's really difficult to add a test. Usually, JIRA is made first. See also
https://spark.apache.org/contributing.html.
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