[PR] perf(table): search global index fields concurrently [paimon-rust]

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

QuakeWang opened a new pull request, #610:
URL: https://github.com/apache/paimon-rust/pull/610

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   ### Purpose
   
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   The global index scanner only parallelized shard reads within a single field. For multi-field `AND` predicates, indexed fields were still evaluated sequentially, leaving the configured I/O concurrency underutilized.
   
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   ### Brief change log
   
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     - Evaluate independent indexed fields concurrently.
     - Share one scan-scoped semaphore across all shard reads so total I/O concurrency stays within `global-index.thread-num`.
     - Add regression coverage for result correctness and the shared concurrency limit.
   
   ### Tests
   
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     - `cargo fmt --all -- --check`
     - `cargo clippy --locked --all-targets --workspace --features fulltext,vortex -- -D warnings`
     - `cargo test --locked -p paimon --all-targets --features fulltext,vortex`
   
   ### API and Format
   
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   ### Documentation
   
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Re: [PR] perf(table): search global index fields concurrently [paimon-rust]

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

JingsongLi merged PR #610:
URL: https://github.com/apache/paimon-rust/pull/610


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