Github user sethah commented on the issue: https://github.com/apache/spark/pull/16699 Ah, thank you very much for that clarification, I don't have much experience using R. I tried this out earlier, and it seems you have to use the same offset column name as you show above. I apologize for not making my intentions clear earlier - I wanted to discuss the R behavior to make sure we were doing the right thing here. We actually discuss R's behavior a lot and even use it as a baseline for our unit tests, as you know. I think being able to compare new Spark PRs to other packages enables reviewers who may not be experts in a particular area to still contribute. More importantly, since it takes quite a lot of time and effort to do code review I like to make sure we have decided on the high-level approach before spending time on implementation details, which I find saves time in the long run. JMO, hope it makes sense :)
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