shardulm94 opened a new pull request #1207:
URL: https://github.com/apache/iceberg/pull/1207


   Completes a part of #1021
   
   Adds support to output the row position within the file as a `_pos` column 
in the data record through ORC readers when the metadata column is provided in 
the expected schema 
   Main changes:
   - Add a `MetadataColumns` class to `iceberg-core` which will define the 
metadata columns supported by Iceberg
   - Expose row batch offset in the file to `OrcValueReader`s so that the we 
can create a new ValueReader which returns the row position
   - Add logic in the `StructReader` to check if a field is a metadata field 
and provide the correct reader for it


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