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https://issues.apache.org/jira/browse/SPARK-23328?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-23328.
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Resolution: Incomplete
> Disallow default value None in na.replace/replace when 'to_replace' is not a
> dictionary
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-23328
> URL: https://issues.apache.org/jira/browse/SPARK-23328
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 2.3.0
> Reporter: Hyukjin Kwon
> Priority: Major
> Labels: bulk-closed
>
> We happened to set {{None}} as a default value via SPARK-19454 which is quite
> weird.
> Looks we better only do this when the input is dictionary.
> Please see https://github.com/apache/spark/pull/16793#issuecomment-362684399
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