Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/21650 ehh .. @BryanCutler, WDYT about just doing the previous one for now? The approach you suggested sounds efficient of course but.. here's not a hot path so I think the previous way is fine too .. since that's a bit cleaner (but a bit less efficient), and partly the code freeze is close.
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