szehon-ho opened a new pull request #3015:
URL: https://github.com/apache/iceberg/pull/3015


   * Partition Spec Id was added to DataFile in 
https://github.com/apache/iceberg/pull/1317 as a derived field from the parent 
manifest file
   * This will be useful to surface to the various metadata tables that have 
data_file field to users
   * Some internal examples of use: #1421 (distributed spark planning), #2608 
(rewrite manifests)
   * From offline discussion with @RussellSpitzer , who pointed to #1421 , from 
which the code logic was mostly extracted


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