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https://issues.apache.org/jira/browse/SPARK-29565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-29565:
-----------------------------------

    Assignee: Huaxin Gao

> OneHotEncoder should support single-column input/ouput
> ------------------------------------------------------
>
>                 Key: SPARK-29565
>                 URL: https://issues.apache.org/jira/browse/SPARK-29565
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML, PySpark
>    Affects Versions: 3.0.0
>            Reporter: zhengruifeng
>            Assignee: Huaxin Gao
>            Priority: Minor
>
> Current feature algs 
> ({color:#5a6e5a}QuantileDiscretizer/Binarizer/Bucketizer/StringIndexer{color})
>  are designed to support both single-col & multi-col.
> And there is already some internal utils (like 
> {color:#c7a65d}checkSingleVsMultiColumnParams{color}) for this.
> For OneHotEncoder, it's reasonable to support single-col.
>  



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