Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17608 It sounds a different issue with this. If it is a question, maybe, it might be better to ask a question to mailing list first before opening a JIRA. If it is really an issue, it might be better to report it with description, snaptops and steps to reproduce like I did above https://github.com/apache/spark/pull/17608#issuecomment-294059200 and https://github.com/apache/spark/pull/17608#issuecomment-293771070 It seems a warning not an error BTW.
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