Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/20464
I was just manually double checking both substr in R and this. It seems
correct; however, I think we should add a note in the doc and release note ...
One followup question is though, would it be difficult to match the
behaviour with substr in R when the index is 0 or minus? If i understood
https://github.com/apache/spark/pull/20464#issuecomment-362150632 correctly, it
sounds better to match it to substr's behaviour in R. Took a quick look/test
and seems we can just set `start` to 1 for both cases.
If this followup question is something we are not sure yet, I think we
might be okay as is.
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