[jira] [Resolved] (SPARK-58772) SelectedField drops column metadata during nested column pruning

["Shixiong Zhu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-58772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shixiong Zhu resolved SPARK-58772.
----------------------------------
    Fix Version/s: 4.4.0
       Resolution: Fixed

Issue resolved by pull request 58007
[https://github.com/apache/spark/pull/58007]

> SelectedField drops column metadata during nested column pruning
> ----------------------------------------------------------------
>
>                 Key: SPARK-58772
>                 URL: https://issues.apache.org/jira/browse/SPARK-58772
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 4.0.0
>            Reporter: Shixiong Zhu
>            Assignee: Shixiong Zhu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.4.0
>
>
> When SelectedField prunes nested columns, it doesn't copy column metadata at the following two places:
>  * [https://github.com/apache/spark/blob/042ad7d0c4ac1c4d3e9fdeb48e2695fdeb861135/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SelectedField.scala#L88]
>  * [https://github.com/apache/spark/blob/042ad7d0c4ac1c4d3e9fdeb48e2695fdeb861135/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SelectedField.scala#L112]
> This can cause column metadata to be dropped and downstream cannot see the column metadata. 



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