luoyuxia opened a new pull request, #200:
URL: https://github.com/apache/paimon-rust/pull/200

   ### Purpose
   
   Linked issue: N/A
   
   Support deletion vector cardinality in index manifest metadata so scan 
planning can preserve the value when building deletion files.
   
   ### Brief change log
   
   - introduce `DeletionVectorMeta` to replace the raw `(offset, length)` tuple 
used by deletion vector ranges
   - deserialize and serialize optional `_CARDINALITY` from index manifest 
metadata
   - propagate deletion vector cardinality into `DeletionFile` during table 
scan planning
   - add a unit test for cardinality propagation and refresh the index manifest 
fixture test to use the production reader and current fixture data
   
   ### Tests
   
   - `cargo test -p paimon spec::index_manifest::tests -- --nocapture`
   
   ### API and Format
   
   - no public API changes
   - extends index manifest metadata handling to preserve optional deletion 
vector cardinality when present in storage
   
   ### Documentation
   
   - N/A
   


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