Github user tgravescs commented on the issue: https://github.com/apache/spark/pull/15370 I don't consider this complex, its simply one number formatter and you say get. Padding to 10 digits isn't necessary in 99% of the cases, so you are just using longer file strings and more digits if its always 10. Also if you use the number formatter in the other cases you don't have to worry about breaking backwards compatibility. It still uses 5 digits up until you would really need. I think we should leave this as number formatter. I also think if we are using it for all the part file formatting leaving in utils makes sense. We could rename it slightly to make it more apparent about its usage.
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