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Posted to issues@spark.apache.org by "L. C. Hsieh (Jira)" <ji...@apache.org> on 2021/09/18 07:48:00 UTC

[jira] [Created] (SPARK-36797) Union should resolve nested columns as top-level columns

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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