Github user sethah commented on the issue:
https://github.com/apache/spark/pull/18832
The comment is not wrong. It's added for when we are finding the best
split, to compute the right child stats from the left child stats. We would
have just used the stats that are already available on the node `node.stats`,
but those aren't available on the first iteration. In the method
`binsToBestSplit`:
````scala
var gainAndImpurityStats: ImpurityStats = if (level == 0) {
null
} else {
node.stats
}
````
Otherwise, instead of parent stats we would just use
`node.stats.impurityCalculator`.
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