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https://issues.apache.org/jira/browse/SPARK-36797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-36797:
-----------------------------------
Assignee: L. C. Hsieh
> 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
> Assignee: L. C. Hsieh
> Priority: Major
>
> 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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