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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