QuakeWang opened a new pull request, #8749:
URL: https://github.com/apache/paimon/pull/8749
### Purpose
`ScoredGlobalIndexResult.top_k` used `(score, row_id)` as its min-heap key.
When tied candidates crossed the top-k boundary, a later higher-scored row
could evict the smaller row ID.
Use `(score, -row_id)` so the retained set consistently follows
score-descending, row-ID-ascending semantics.
### Tests
- Added regression coverage for ties at the top-k boundary.
- `vindex_vector_index_test.py`: 3 passed.
- Python license and flake8 checks passed.
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