[
https://issues.apache.org/jira/browse/SPARK-54289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18037244#comment-18037244
]
Szehon Ho commented on SPARK-54289:
-----------------------------------
Most of the building blocks should already be in :
https://github.com/apache/spark/pull/52225
> 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: Improvement
> 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
