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https://issues.apache.org/jira/browse/SPARK-56031?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-56031:
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Labels: pull-request-available (was: )
> NATURAL JOIN ignores case-insensitive column matching
> -----------------------------------------------------
>
> Key: SPARK-56031
> URL: https://issues.apache.org/jira/browse/SPARK-56031
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.2.0
> Reporter: Stefan Kandic
> Priority: Major
> Labels: pull-request-available
>
> NATURAL JOIN uses case-sensitive string comparison to find common columns
> between the left and right sides of the join, regardless of the
> spark.sql.caseSensitive setting (which defaults to false).
> This means columns that differ only in case (e.g. ID vs id) are not
> recognized as common columns, and the NATURAL JOIN silently degrades to a
> CROSS JOIN — returning incorrect results with duplicate columns instead of
> joining on the matching column.
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