leaves12138 opened a new pull request, #4651:
URL: https://github.com/apache/paimon/pull/4651

   <!-- Please specify the module before the PR name: [core] ... or [flink] ... 
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   ### Purpose
   
   <!-- Linking this pull request to the issue -->
   The key-value storage (in primary-key table) are redundant.
   Now, the format of a row is:   _KEY_a, _KEY_b, _FIELD_SEQUENCE, _ROW_KIND, 
a, b, c, d, e, f, g
   The column "a" and "b" have double restored. A optimization is:
   <pre>
   convert    _KEY_a, _KEY_b, _FIELD_SEQUENCE, _ROW_KIND, a, b, c, d, e, f, g
   
   to         a, b, _FIELD_SEQUENCE, _ROW_KIND, c, d, e, f, g
   </pre>
   
   While reading, we find the `a`, `b` from key and fill them to value.
   
   This PR is not complete, unit tests and compatibility test will need to be 
done.
   
   <!-- What is the purpose of the change -->
   
   ### Tests
   
   <!-- List UT and IT cases to verify this change -->
   
   ### API and Format
   
   <!-- Does this change affect API or storage format -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   


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