moon-fall commented on issue #2679:
URL: https://github.com/apache/iceberg/issues/2679#issuecomment-856691813


   > I think this is because the Iceberg identifier field column can be 
nullable, but Flink does not allow nullable primary key column. Is it the case 
for you? What is the type of `id` column in your Iceberg schema?
   
   yes, the type of `id` column is string


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