[PR] feat(datafusion): consolidate DML WriteBuilder usage [paimon-rust]

["QuakeWang (via GitHub)" <gi...@apache.org>]

QuakeWang opened a new pull request, #384:
URL: https://github.com/apache/paimon-rust/pull/384

   ### Purpose
   
   Linked issue: close #232
   
   DataFusion DML already had table write/update paths, but append-only MERGE INTO still created write and commit builders at separate call sites, and the supported/unsupported DML boundaries were not documented clearly. This made the WriteBuilder integration look incomplete and left primary-key row-level DML easy to misinterpret as supported.
   
   ### Brief change log
   
   - Reuse one `WriteBuilder` across append-only CoW MERGE INTO not-matched inserts and the final commit.
   - Keep `CopyOnWriteMergeWriter` responsible for CoW rewrites instead of exposing it through the public builder API.
   - Add regression coverage for unsupported UPDATE, DELETE, and MERGE INTO cases.
   - Document the current DataFusion DML support matrix.
   
   ### Tests
   
   - `cargo fmt --all -- --check`
   - `cargo clippy --all-targets --workspace --features fulltext,vortex -- -D warnings`
   - `cargo test -p paimon-datafusion --test update_tests --test delete_tests --test merge_into_tests --test append_merge_into`
   
   ### API and Format
   
   No public API or storage format changes.
   
   ### Documentation
   
   Updated `docs/src/sql.md` with the DataFusion DML support matrix.


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Re: [PR] feat(datafusion): consolidate DML WriteBuilder usage [paimon-rust]

["JingsongLi (via GitHub)" <gi...@apache.org>]

JingsongLi merged PR #384:
URL: https://github.com/apache/paimon-rust/pull/384


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