Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20464#discussion_r165584849
  
    --- Diff: docs/sparkr.md ---
    @@ -663,3 +663,7 @@ You can inspect the search path in R with 
[`search()`](https://stat.ethz.ch/R-ma
      - The `stringsAsFactors` parameter was previously ignored with `collect`, 
for example, in `collect(createDataFrame(iris), stringsAsFactors = TRUE))`. It 
has been corrected.
      - For `summary`, option for statistics to compute has been added. Its 
output is changed from that from `describe`.
      - A warning can be raised if versions of SparkR package and the Spark JVM 
do not match.
    +
    +## Upgrading to Spark 2.4.0
    +
    + - The first parameter of `substr` method was wrongly subtracted by one, 
previously. This can lead to inconsistent substring results and also does not 
match with the behaviour with `substr` in R. It has been corrected.
    --- End diff --
    
    Fixed.


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