[PR] [python] Support allow_exact_matches in temporal as-of joins [paimon]

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

QuakeWang opened a new pull request, #9915:
URL: https://github.com/apache/paimon/pull/9915

   ### Purpose
   
   As-of joins always allow equal timestamps, and tolerance cannot express strict matching.
   
   Add `allow_exact_matches=False` to top-level and chained `join_asof` for all three directions. Preserve default behavior, grouping, tolerance, and tie-breaking rules. Document that strict matching with zero tolerance produces no matches.
   
   ### Tests
   
     - Temporal tests: 71 passed.
     - Flake8 4.0.1 and 7.1.2 passed for changed Python files.
     - `git diff --check` passed.
   


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Re: [PR] [python] Support allow_exact_matches in temporal as-of joins [paimon]

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

JingsongLi merged PR #9915:
URL: https://github.com/apache/paimon/pull/9915


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