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https://issues.apache.org/jira/browse/SPARK-42918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-42918.
---------------------------------
Fix Version/s: 3.5.0
Resolution: Fixed
Issue resolved by pull request 40545
[https://github.com/apache/spark/pull/40545]
> Generalize handling of metadata attributes in FileSourceStrategy
> ----------------------------------------------------------------
>
> Key: SPARK-42918
> URL: https://issues.apache.org/jira/browse/SPARK-42918
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer
> Affects Versions: 3.4.1
> Reporter: Johan Lasperas
> Priority: Minor
> Fix For: 3.5.0
>
>
> A first step towards allowing file format implementations to inject custom
> metadata fields into plans is to make the handling of metadata attributes in
> `FileSourceStrategy` more generic.
> Today in `FileSourceStrategy` , the lists of constant and generated metadata
> fields are created manually, checking for known generated fields on one hand
> and considering the remaining fields as constant metadata fields. We need
> instead to introduce a way of declaring metadata fields as generated or
> constant directly in `FileFormat` and propagate that information to
> `FileSourceStrategy`.
>
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