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https://issues.apache.org/jira/browse/SPARK-23265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang-Chi Hsieh reassigned SPARK-23265:
---------------------------------------

    Assignee: Huaxin Gao

> Update multi-column error handling logic in QuantileDiscretizer
> ---------------------------------------------------------------
>
>                 Key: SPARK-23265
>                 URL: https://issues.apache.org/jira/browse/SPARK-23265
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 2.3.0
>            Reporter: Nick Pentreath
>            Assignee: Huaxin Gao
>            Priority: Major
>
> SPARK-22397 added support for multiple columns to {{QuantileDiscretizer}}. If 
> both single- and mulit-column params are set (specifically {{inputCol}} / 
> {{inputCols}}) an error is thrown.
> However, SPARK-22799 added more comprehensive error logic for {{Bucketizer}}. 
> The logic for {{QuantileDiscretizer}} should be updated to match. *Note* that 
> for this transformer, it is acceptable to set the single-column param for 
> \{{numBuckets}} when transforming multiple columns, since that is then 
> applied to all columns.



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