L. C. Hsieh created SPARK-36797:
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Summary: Union should resolve nested columns as top-level columns
Key: SPARK-36797
URL: https://issues.apache.org/jira/browse/SPARK-36797
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.3.0
Reporter: L. C. Hsieh
Union, by definition, resolves columns by position. Currently we only follow
this behavior at top-level columns, but not nested columns.
As we are making nested columns as first-class citizen, the nested-column-only
limitation and the difference between top-level column and nested column do not
make sense.
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