Github user viirya commented on the issue:
https://github.com/apache/spark/pull/20464
@shivaram This fix is to make it correctly 1-based. Previously SparkR
substr API substracts starting position by 1, so it becomes zero-based.
This fix matches R's substr in above link as I test:
```R
> substr("Michael", 4, 6)
[1] "hae"
```
Before this fix, SparkR's substr returns "cha".
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