pvary commented on issue #14699:
URL: https://github.com/apache/iceberg/issues/14699#issuecomment-3586668173

   From the docs:
   > OVERWRITE and UPSERT modes are mutually exclusive and cannot be enabled at 
the same time. When using UPSERT mode with a partitioned table, source columns 
of corresponding partition fields must be included in the equality fields. For 
example, if the partition field is days(ts), then ts must be part of the 
equality fields.
   
   OVERWRITE is overwriting a whole partition. It is for batch jobs only.
   
   UPSERT is for updating the records one-by-one based on PK.
   
   You should choose one of the ways for the updates
   
   


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