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https://issues.apache.org/jira/browse/SPARK-17498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15484129#comment-15484129
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miroslav Balaz commented on SPARK-17498:
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No I meant, that it should return 3 and 3 for "d" and "e", it corresponds to
mapping unseen lables to one 'unknown' class.
> StringIndexer.setHandleInvalid sohuld have another option 'new'
> ---------------------------------------------------------------
>
> Key: SPARK-17498
> URL: https://issues.apache.org/jira/browse/SPARK-17498
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Miroslav Balaz
>
> That will map unseen label to maximum known label +1, IndexToString would map
> that back to "<undef>" or NA if there is something like that in spark,
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