Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/20464
One thing to keep in mind is what the user's perception of the API is. If R
users are going to use 1-based indexing then this might not be the right fix ?
http://stat.ethz.ch/R-manual/R-devel/library/base/html/substr.html is the base
R function FWIW
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