{
  "date": "2026-10-16",
  "issue": 237,
  "workflow_run": "https://github.com/datafusion-contrib/StreamFusion/actions/runs/38865289316",
  "branch_head": "23d16dce7039bd2e1ffba589247944919e74a446",
  "actual_merge_checkout": "30c446544f8f358512f37d5db3cabb5502ce033f",
  "source_equivalence": "git diff --exit-code passes between branch and merge for src/main, entire native tree, root/core/runtime poms, runner and both benchmark fixtures",
  "variant": "primitive STRING hash-index cache; symmetric preflight; borrowed STRING exit; before borrowed 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.",
    "No corrected-preflight comparison against the actual previous fallback revision in this matrix.",
    "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 is ON. The subsequent borrowed key-projection change requires its own matrix.",
    "Aggregate distinct-key cases include regressions and wide variability. Table-function widths remain workload-specific; full ranges retained."
  ],
  "runs": [
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      "native_payload_cache_hit": "",
      "cpu_count": 4,
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      "configuration": {
        "rows": 2000000,
        "capacity": 65536,
        "warmup_pairs": 2,
        "pairs": 5,
        "heap": "2 GiB",
        "parallelism": 1,
        "production_ipc": true,
        "both_transposes": true,
        "cluster_lifetime": "per job",
        "preflight_explain": "both engines outside the clock",
        "fixture_method": "symmetric-preflight-v2",
        "borrowed_string_exit": true,
        "boundary": "complete executeSql(insert).await; cluster boot/config outside clock"
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  "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."
}
