[jira] [Resolved] (SPARK-57544) Rework column ID validation for nested fields in DSv2

["Gengliang Wang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-57544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gengliang Wang resolved SPARK-57544.
------------------------------------
      Assignee: Anton Okolnychyi
    Resolution: Fixed

Resolved in https://github.com/apache/spark/pull/56796/

> Rework column ID validation for nested fields in DSv2
> -----------------------------------------------------
>
>                 Key: SPARK-57544
>                 URL: https://issues.apache.org/jira/browse/SPARK-57544
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 4.2.0
>            Reporter: Anton Okolnychyi
>            Assignee: Anton Okolnychyi
>            Priority: Major
>              Labels: pull-request-available
>
> The original implementation detected dropped-and-re-added columns by comparing top-level Column.id() strings in a dedicated validateColumnIds pass, but this approach had no visibility into nested struct fields, array elements, or map keys/values. To work around this limitation, connectors had to encode nested field IDs into the top-level ID string (as demonstrated by ComposedColumnIdTableCatalog), placing an unreasonable burden on connector authors and making the feature fragile by design.



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