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https://issues.apache.org/jira/browse/SPARK-11535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993546#comment-14993546
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Apache Spark commented on SPARK-11535:
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User 'pravingadakh' has created a pull request for this issue:
https://github.com/apache/spark/pull/9522
> StringIndexer should handle empty String specially
> --------------------------------------------------
>
> Key: SPARK-11535
> URL: https://issues.apache.org/jira/browse/SPARK-11535
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> StringIndexer will treat an empty string like any other string and index it
> properly. However, the feature attribute name will be set to the empty
> string, which causes a failure in OneHotEncoder. We should handle it
> specially by calling it something like "(empty_string)" (and maybe append an
> integer if that string already exists).
> See [https://issues.apache.org/jira/browse/SPARK-10513] for a description of
> the problem.
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