Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/17477 Thank you for your pointer and details. No.. I haven't seen such things before. So, maven + 2.7, maven + 2.6 and sbt + 2.7 are fine but sbt + 2.6 is being failed. Let me try to reproduce this in my local and try to look into this. It sounds tricky..
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