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https://issues.apache.org/jira/browse/SPARK-29565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16957664#comment-16957664
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zhengruifeng commented on SPARK-29565:
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[~huaxingao] In [https://github.com/apache/spark/pull/26064,] I guess you
maybe interested in the tickets (SPARK-29565/SPARK-29566). If you would like to
work on this, please feel free to ping me in the PRs.
> 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
> 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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