[jira] [Commented] (SPARK-14159) StringIndexerModel sets output column metadata incorrectly

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-14159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212369#comment-15212369 ] 

Apache Spark commented on SPARK-14159:
--------------------------------------

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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