yuzelin opened a new pull request, #6213:
URL: https://github.com/apache/paimon/pull/6213
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### Purpose
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A brief case is:
```
CREATE TABLE test (a INT PRIMARY KEY NOT ENFORCED, b INT NOT NULL) WITH
('merge-engine' = 'aggregation', 'changelog-producer' = 'lookup');
INSERT INTO test VALUES (1, 1);
-- Then the upstream input -D(1, 1)
```
The problem is that default agg for b is last-non-null-value which produces
null when retracting.
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### Tests
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### API and Format
<!-- Does this change affect API or storage format -->
### Documentation
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