[jira] [Resolved] (SPARK-27944) Unify the behavior of checking empty output column names

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-27944?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-27944.
-------------------------------
       Resolution: Fixed
    Fix Version/s: 3.0.0

Issue resolved by pull request 24793
[https://github.com/apache/spark/pull/24793]

> Unify the behavior of checking empty output column names
> --------------------------------------------------------
>
>                 Key: SPARK-27944
>                 URL: https://issues.apache.org/jira/browse/SPARK-27944
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 3.0.0
>            Reporter: zhengruifeng
>            Assignee: zhengruifeng
>            Priority: Minor
>             Fix For: 3.0.0
>
>
> In some algs (LDA, DT, GBTC, SVC, LR, MLP, NB), the transform method will check whether an output column name is empty, and if all names are empty, it will log a warning msg and do nothing.
>  
> It maybe better to make other algs (regression, ovr, clustering, als) also check the output columns before transformation.



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