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Posted to issues@spark.apache.org by "Jungtaek Lim (Jira)" <ji...@apache.org> on 2025/09/19 00:31:00 UTC

[jira] [Assigned] (SPARK-53625) Propagate metadata columns through projections to address ApplyCharTypePadding incompatibility in streaming

     [ https://issues.apache.org/jira/browse/SPARK-53625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jungtaek Lim reassigned SPARK-53625:
------------------------------------

    Assignee: Livia Zhu

> Propagate metadata columns through projections to address ApplyCharTypePadding incompatibility in streaming
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-53625
>                 URL: https://issues.apache.org/jira/browse/SPARK-53625
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>    Affects Versions: 4.1.0
>            Reporter: Livia Zhu
>            Assignee: Livia Zhu
>            Priority: Major
>              Labels: pull-request-available
>
> Currently, streams where the output DF access the `_metadata` column with a char type in the schema and ApplyCharTypePadding rule applied will encounter an AssertionError in streaming MicrobatchExecution. This is because the ApplyCharTypePadding rule hides the metadata column with a Projection and this code ([https://github.com/apache/spark/blob/87a71fabb097e1543a935fae8167bc47a29a127e/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/runtime/MicroBatchExecution.scala#L803)] does not propagate the metadata column through the projection.



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