rdblue commented on issue #417: Adding support for time-based partitioning on 
long column type
URL: 
https://github.com/apache/incubator-iceberg/issues/417#issuecomment-528642887
 
 
   Iceberg stores identity partition data in both data files and metadata files 
because the values are the same. Engines are free to use either one, but for 
backward compatibility with existing data, Spark and other readers will use the 
metadata values when reading.

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