QuakeWang opened a new pull request, #9107:
URL: https://github.com/apache/paimon/pull/9107
### Purpose
`MAP<K, BLOB>` writers accepted duplicate keys from Python key-value pairs
and Java binary-key maps, while readers silently kept the last value. This
violated map uniqueness and could persist discarded BLOB payloads.
Validate serialized keys before writing and reject duplicate-key payloads
when reading in Java and Python.
### Tests
- Java MAP BLOB format tests
- Python writer, reader, and table tests
- Checkstyle, Spotless, Enforcer, Flake8, and license checks
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