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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2025/11/10 21:02:00 UTC
[jira] [Updated] (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 updated SPARK-54289:
----------------------------------
Parent: SPARK-54274
Issue Type: Sub-task (was: Improvement)
> 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
> Priority: Major
> 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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