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https://issues.apache.org/jira/browse/SPARK-23234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16364510#comment-16364510
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Joseph K. Bradley commented on SPARK-23234:
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Is this still a blocker now that [SPARK-22797] has been reverted?  I assume 
[SPARK-22797] won't get into 2.3 at this point since it's a new API.

> ML python test failure due to default outputCol
> -----------------------------------------------
>
>                 Key: SPARK-23234
>                 URL: https://issues.apache.org/jira/browse/SPARK-23234
>             Project: Spark
>          Issue Type: Bug
>          Components: ML, PySpark
>    Affects Versions: 2.3.0
>            Reporter: Marco Gaido
>            Priority: Blocker
>
> SPARK-22799 and SPARK-22797 are causing valid Python test failures. The 
> reason is that Python is setting the default params with set. So they are not 
> considered as defaults, but as params passed by the user.
> This means that an outputCol is set not as a default but as a real value.
> Anyway, this is a misbehavior of the python API which can cause serious 
> problems and I'd suggest to rethink the way this is done.



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