Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22641
I am not sure about this @dilipbiswal. Taking only one element is a bit too
risky as there may be a working combination and a non-working one and here you
don't know which one you are picking. I am afraid this could create very
instable tests in case of regression, with the serious risk of non-detecting a
regression on a run.
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