parthchandra opened a new issue, #5054:
URL: https://github.com/apache/datafusion-comet/issues/5054

   ### What is the problem the feature request solves?
   
   Iceberg's metadata columns are currently no supported by Comet.  A common 
use case for Iceberg (merge-on-read, copy-on-write) requires reading the 
metadata columns `_file,` `_pos`, `_spec`, and `_partition`.  Iceberg scans 
automatically introduce these columns if required. Because these are not 
supported, these jobs simply fall back to Spark.
   
   ### Describe the potential solution
   
   Add support for these columns. 
   
   ### Additional context
   
   _file, _pos, and, _spec are already supported by iceberg-rust. _partition is 
being reviewed.


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