[PR] feat(index): support dry run when dropping global indexes [paimon-rust]

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

QuakeWang opened a new pull request, #1078:
URL: https://github.com/apache/paimon-rust/pull/1078

   ### Purpose
   
   Global index drops currently provide no preview, and SQL rejects `dry_run`. Add an opt-in preview that returns the matched index file count without committing, consistent with Java Paimon. 
   
   ### Brief change log
   
   - Add `with_dry_run(bool)`, defaulting to false, and reuse existing drop matching.
   - Validate the SQL argument, report preview counts, and preserve normal execution.
   
   ### Tests
   
   - 11 builder tests and 44 SQL procedure tests passed with `fulltext,vortex`.
   - Tests cover unchanged table files, matching, invalid values, and normal drops.
   - CI-pinned Rust 1.98.0 formatting and strict workspace Clippy passed.
   
   ### API and Format
   
   Adds an optional builder/SQL argument. No storage format changes. Partition filtering remains out of scope.
   
   ### Documentation
   
   Updated the SQL guide with the parameter, output, and snapshot semantics.


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Re: [PR] feat(index): support dry run when dropping global indexes [paimon-rust]

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

JingsongLi merged PR #1078:
URL: https://github.com/apache/paimon-rust/pull/1078


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