JingsongLi opened a new pull request, #1594:
URL: https://github.com/apache/incubator-paimon/pull/1594

   <!-- Please specify the module before the PR name: [core] ... or [flink] ... 
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   ### Purpose
   
   <!-- Linking this pull request to the issue -->
   - When delete Ignore is enabled
   - and the last data of the key is delete
   - which occurs in Sink's WriteBuffer
   
   There will be a bug in object reuse.
   
   
   We should update key reference even the incoming record is a delete record.
   
   <!-- What is the purpose of the change -->
   
   ### Tests
   
   <!-- List UT and IT cases to verify this change -->
   
   Introduce classes in `SortBufferWriteBufferTestBase`:
   1. WithPartialUpdateMergeFunctionTest
   2. WithAggMergeFunctionTest
   3. WithLookupFunctionTest
   
   ### API and Format
   
   <!-- Does this change affect API or storage format -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   


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