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https://issues.apache.org/jira/browse/SPARK-14159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212369#comment-15212369
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Apache Spark commented on SPARK-14159:
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User 'jkbradley' has created a pull request for this issue:
https://github.com/apache/spark/pull/11965
> StringIndexerModel sets output column metadata incorrectly
> ----------------------------------------------------------
>
> Key: SPARK-14159
> URL: https://issues.apache.org/jira/browse/SPARK-14159
> Project: Spark
> Issue Type: Bug
> Components: ML
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
> Priority: Minor
>
> StringIndexerModel.transform sets the output column metadata to use name
> inputCol. It should not. Fixing this causes a problem with the metadata
> produced by RFormula.
> Fix in RFormula: I added the StringIndexer columns to prefixesToRewrite, and
> I modified VectorAttributeRewriter to find and replace all "prefixes" since
> attributes collect multiple prefixes from StringIndexer + Interaction.
> Note that "prefixes" is no longer accurate since internal strings may be
> replaced.
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