Wenchen Fan created SPARK-31166:
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Summary: UNION map<null, null> and other maps should not fail
Key: SPARK-31166
URL: https://issues.apache.org/jira/browse/SPARK-31166
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Wenchen Fan
Assignee: Wenchen Fan
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