[SPARK-23291][SQL][R][BRANCH-2.3] R's substr should not reduce starting position by 1 when calling Scala API#21250

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HyukjinKwon wants to merge 4 commits intoapache:branch-2.3from

HyukjinKwon:SPARK-23291-backport

Commits on May 6, 2018

[SPARK-23291][SQL][R] R's substr should not reduce starting position by 1 when calling Scala API

viirya
authored and
HyukjinKwon
committed
Update SparkR migration note for SPARK-23291
HyukjinKwon
committed

Commits on May 7, 2018