Github user NarineK commented on the pull request:
https://github.com/apache/spark/pull/12966#issuecomment-217958625
Well, since the user provides the R function, I think he/she should provide
the aggregate too.
Instead of providing:
```
function(x) {
data.frame(x$Species[1], mean(x$Sepal_Width), stringsAsFactors = FALSE)
}
```
They will provide:
```
function(x) {
data.frame(aggregate(x$Sepal_Width, by = list(x$Species), FUN =
mean), stringsAsFactors = FALSE)
}
```
This is my understanding, there may be also other ways ...
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