Hyukjin Kwon created SPARK-23328:
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Summary: Disallow default value None 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
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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