{ "date": "2026-10-16", "issue": 237, "workflow_run": "https://github.com/datafusion-contrib/StreamFusion/actions/runs/38867512587", "branch_head": "e8da71cc64c99da073361be23eec3ad76bb4d6d2", "actual_merge_checkout": "d8c9776004bc98867aff6a77b968c4d8c77e1a13", "source_equivalence": "Full git diff --exit-code between branch e8da71cc and actual merge d8c97760 passes for src/main, entire native tree, root/core/runtime poms, both runners and all three benchmark fixtures.", "variant": "primitive STRING hash-index cache; symmetric preflight; borrowed STRING exit and owned key projection", "admitted": false, "limitations": [ "Two warmups and five alternating complete-job pairs per case. All negative results and ranges retained.", "Four logical CPU GitHub-hosted Ubuntu jobs, separate Flink lines. Physical host interference is not measured.", "Actual previous fallback revision is measured after candidate cases on the same runner. Separate JVMs and stock control drift limit causal attribution.", "Whole-process profiles include UDAF and Rust builtin SUM controls, warmups, setup and JIT. Profile timings excluded. Inclusive stack totals overlap.", "Java allocation samples estimate allocation volume; they are not copied bytes, peak memory or native heap totals.", "Borrowed STRING exit and owned key projection are ON. Aggregates, accumulator caching and the new exit remain default off.", "Aggregate distinct-key cases include regressions and wide variability. 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"stop_the_world_gc_ms": 1070.67236328125 }, { "engine": "Flink", "trial": 5, "warmup": false, "seconds": 3.244041, "stop_the_world_gc_ms": 1053.974853515625 }, { "engine": "Flink", "trial": 6, "warmup": false, "seconds": 3.246157, "stop_the_world_gc_ms": 1045.443603515625 }, { "engine": "StreamFusion", "trial": 6, "warmup": false, "seconds": 3.333431, "stop_the_world_gc_ms": 1071.200439453125 } ] } ] } ], "gc_method": "GC pause summary events (exact gc tag, excluding phase/start duplicates) intersect each recorded executeSql interval using wall-clock timestamps. Summed stop-the-world time is diagnostic only; no time is subtracted from results. Concurrent GC and safepoint/non-GC work are not included in this measure." }