Xingbo Jiang created SPARK-28706:
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Summary: Allow upcast from null type to any types
Key: SPARK-28706
URL: https://issues.apache.org/jira/browse/SPARK-28706
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Xingbo Jiang
Assignee: Xingbo Jiang
It should be safe to upcast from null type to any types.
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