Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/14779
btw, you might want to avoid using `iris` for example. There has been
several bugs where people would like to address the limitation with column
names with `.` - if that is fixed then the example would be wrong to reference
column as `Sepal_Length` instead of its original name `Sepal.Length`
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