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https://issues.apache.org/jira/browse/SPARK-54289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun resolved SPARK-54289.
-----------------------------------
Fix Version/s: 4.1.0
Resolution: Fixed
Issue resolved by pull request 53149
[https://github.com/apache/spark/pull/53149]
> Allow MERGE INTO to preserve existing struct fields for UPDATE SET * when
> source has less fields
> ------------------------------------------------------------------------------------------------
>
> Key: SPARK-54289
> URL: https://issues.apache.org/jira/browse/SPARK-54289
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Szehon Ho
> Assignee: Szehon Ho
> Priority: Major
> Labels: data-loss, pull-request-available
> Fix For: 4.1.0
>
>
> SPARK-53482 allow source struct to have less fields than target struct.
> However MERGE INTO statement with UPDATE SET * can be interpreted two ways.
> Either replace entire struct (top level) or keep the fields in target not in
> source.
>
> The current behavior is the first option, but we should allow users the
> second option to prevent inadvertent data loss.
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