Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/19018
the error specifically is:
`The input column stridx_87ea3065aeb2 should have at least two distinct
values.`
I don't think this would be only happening in R - I suppose whenever the
string label has only one distinct value, ml's random forest will just give up
like this.
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