Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/21320 Yup, for example, https://github.com/apache/spark/pull/21320#discussion_r203931755 https://github.com/apache/spark/pull/21320#discussion_r203932334 https://github.com/apache/spark/pull/21320#discussion_r203933307 https://github.com/apache/spark/pull/21320#discussion_r203933423 https://github.com/apache/spark/pull/21320#discussion_r203934281 https://github.com/apache/spark/pull/21320#issuecomment-407713622
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