Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/16883#discussion_r104296367
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -163,25 +190,28 @@ class StringIndexerModel (
}
transformSchema(dataset.schema, logging = true)
+ val metadata = NominalAttribute.defaultAttr
+ .withName($(outputCol)).withValues(labels).toMetadata()
--- End diff --
Yep, that's what I meant: In ```withValues(labels)```, labels can be set
as:
```
val labels = getHandleInvalid match {
case StringIndexer.KEEP_UNSEEN_LABEL => labels :+ "__unknown"
case _ => labels
}
```
I'm adding underscores to the attribute name to make it a little less
likely to hit conflicts.
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