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https://issues.apache.org/jira/browse/SPARK-12779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feynman Liang closed SPARK-12779.
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Resolution: Duplicate
> StringIndexer should handle null
> --------------------------------
>
> Key: SPARK-12779
> URL: https://issues.apache.org/jira/browse/SPARK-12779
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 1.6.0
> Reporter: Feynman Liang
>
> StringIndexer currently fails with a {{NullPointerException}} when indexing a
> column containing {{null}}s. It should instead index all {{null}}s into some
> sentinel value (say -1).
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