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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2025/11/10 22:54:00 UTC

[jira] [Assigned] (SPARK-54289) Allow MERGE INTO to preserve existing struct fields for UPDATE SET * when source has less fields

     [ https://issues.apache.org/jira/browse/SPARK-54289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun reassigned SPARK-54289:
-------------------------------------

    Assignee: Szehon Ho

> 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
>
> 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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