mxm commented on issue #15900:
URL: https://github.com/apache/iceberg/issues/15900#issuecomment-4305077586

   Just for context: We have to make sure a given equality key value gets 
processed by the only one writer. Otherwise, multiple writers would be writing 
delete files which could conflict. For non-partitioned table, we partition by 
the equality value itself. For partitioned table, like in your case, we enforce 
that the equality values are a subset of the partition key.


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