[jira] [Assigned] (SPARK-54525) Disable nested struct coercion in MERGE INTO

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-54525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dongjoon Hyun reassigned SPARK-54525:
-------------------------------------

    Assignee: Szehon Ho

> Disable nested struct coercion in MERGE INTO
> --------------------------------------------
>
>                 Key: SPARK-54525
>                 URL: https://issues.apache.org/jira/browse/SPARK-54525
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 4.1.0
>            Reporter: Szehon Ho
>            Assignee: Szehon Ho
>            Priority: Major
>              Labels: pull-request-available
>
> https://issues.apache.org/jira/browse/SPARK-53482 allow MERGE INTO to support case where assignment value is a struct with less fields than the assignment key, ie UPDATE SET big_struct = source.small_struct
> This bring some interesting question, for example there is some ambiguity in user intent.  Does the UPDATE SET * mean set all nested fields or top level columns.  In the first case, missing fields are kept.  In the second case, missing fields are nullified.
> https://issues.apache.org/jira/browse/SPARK-54289 is a bit controversial, choosing one interpretation over another.  A SQLConf may not be the right choice, and instead we may need to introduce some new syntax, which require more discussion.  So disabling for 4.1.



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