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https://issues.apache.org/jira/browse/SPARK-43039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17710381#comment-17710381
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Snoot.io commented on SPARK-43039:
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User 'ryan-johnson-databricks' has created a pull request for this issue:
https://github.com/apache/spark/pull/40677
> Support custom fields in the file source _metadata column
> ---------------------------------------------------------
>
> Key: SPARK-43039
> URL: https://issues.apache.org/jira/browse/SPARK-43039
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core
> Affects Versions: 3.4.0
> Reporter: Ryan Johnson
> Priority: Major
>
> Today, the schema of the file source _metadata column depends on the file
> format (e.g. parquet file format supports {{{}_metadata.row_index{}}}) but
> this is hard-wired into the {{FileFormat}} itself. Not only is this an ugly
> design, it also prevents custom file formats from adding their own fields to
> the {{_metadata}} column.
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