pvary opened a new pull request, #12604:
URL: https://github.com/apache/iceberg/pull/12604

   A possible implementation for the ORC initial default values.
   2 main changes:
   - The Iceberg type (`TypeDescription  record`) is pushed down to the 
GenericOrcReaders.StructReader
   - The ORC type stores an attribute 
(`.getAttributeValue(ORCSchemaUtil.ICEBERG_ORIGINAL_MISSING)`) to filter out 
the columns which are needed, but not present in the ORC file
   
   Based on this 2 information the reader could decide on when to use the 
initial default values.


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