Github user susanxhuynh commented on the issue: https://github.com/apache/spark/pull/20641 Thanks for the PR! It seems that the previous attempt to fix this (SPARK-18114) was wrong -- I'm not sure why we didn't catch the problem before, maybe lack of testing? @krcz My suggestion for this patch is to add a test, in order to prevent another regression in the future. I've written a unit test for this -- you could do something similar: https://github.com/mesosphere/spark/commit/4812ba3d10264f6d22ec654fa16b5810d70c27a9 I will also do more testing with my own integration tests. cc @skonto
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