Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19949 To be clear, I am not against this change. I am asking this because simply I remember I was working on another stuff related with tests but the elapsed time concern was raised before. I see a bunch of tests being added here and I think it's a valid concern. I simply just wonder the elapsed time (wouldn't be difficult to check) and how many tests are supposed to be added.
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