lxy-9602 opened a new pull request, #444:
URL: https://github.com/apache/paimon-cpp/pull/444

   <!-- PR titles must follow Conventional Commits: <type>(<optional-scope>): 
<description> -->
   
   ### Purpose
   
   <!-- Linking this pull request to the issue -->
   Linked issue: #158 
   
   - Add pool-backed HashMap and DenseHashTable utilities adapted from Havenask.
   - Store key hashes instead of original keys, with lazy disk lookup through a 
shared CacheManager.
   - Generate one .offset sidecar per rolled data file, including lifecycle and 
abort cleanup.
   <!-- What is the purpose of the change -->
   
   ### Tests
   - UT coverage for hashing, containers, cached reads, rolling and cleanup.
   - IT coverage for reads before/after prepare and refresh, plus restart 
recovery.
   <!-- List UT and IT cases to verify this change -->
   
   ### API and Format
   No public API changes. Replace the previous .offset layout with version 1 
containing key-hash-to-offset entries. Previous files are incompatible; hash 
collisions are not resolved.
   <!-- Does this change affect API in include dir or storage format or 
protocol -->
   
   ### Documentation
   
   <!-- Does this change introduce a new feature -->
   
   ### Generative AI tooling
   Generated-by: OpenAI Codex 
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