chenjunjiedada opened a new pull request #2538:
URL: https://github.com/apache/iceberg/pull/2538


   This adds a metadata column to indicate whether a row is deleted or not.  A 
delete marker column can be used when finding the deleted rows as we discussed 
in https://github.com/apache/iceberg/pull/2372, it can also be used to simplify 
the overall merge on read process.  In order to avoid overhead, the delete 
marker metadata column only projected when the delete files exist.


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