[core] Stabilize scored global index top-k tie-breaking#8301
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Signed-off-by: QuakeWang <wangfuzheng0814@foxmail.com>
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Purpose
ScoredGlobalIndexResult.topKused a min-heap ordered only by score, and replaced the heap head only when a new row had a strictly higher score. When rows tied around the top-k boundary, the retained row IDs could differ from the expectedscore desc, rowId ascranking semantics.This patch makes the heap head represent the weakest retained candidate by
score asc, rowId desc, so tied boundary rows prefer smaller row IDs while keeping the existingO(n log k)algorithm.Tests
mvn -pl paimon-common -Dtest=ScoredGlobalIndexResultTest,HybridSearchRankerTest test