[jira] [Created] (SPARK-43039) Support custom fields in the file source _metadata column

["Ryan Johnson (Jira)" <ji...@apache.org>]

Ryan Johnson created SPARK-43039:
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             Summary: 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


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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