{
  "date": "2026-10-16",
  "issue": 237,
  "workflow_run": "https://github.com/datafusion-contrib/StreamFusion/actions/runs/38854638683",
  "branch_head": "dd53a0316130e280b4b0b7605e8ddb404f76d15d",
  "actual_merge_checkout": "2b0a88180fc332b3119bbee0b2c0d860736006ee",
  "source_equivalence": "Verified empty diff between recorded branch head and merge checkout for src/main, the full native tree, root/core/runtime poms, runner and query fixture",
  "variant": "STRING owned-key cache with copying probes, before borrowed probe and primitive STRING hash index",
  "admitted": false,
  "limitations": [
    "GitHub-hosted Ubuntu runner, four logical CPUs per job; no other own build/test during measurements. Shared physical-host interference is not measured.",
    "Two warmups and five alternating complete-job pairs. All ranges and negative results retained. Broad distinct-key variability prevents a blanket admission.",
    "No separate previous-fallback revision comparison in this run.",
    "Whole-process profiles include both UDAF and builtin SUM controls, warmups, cluster setup and JIT. Inclusive counts overlap; downstream output copying is included under the aggregate ingest call.",
    "Sampled allocations are estimates, not copied bytes, peak memory or Rust heap totals. All profile timings excluded.",
    "Results precede the STRING cache experiment; they do not validate its throughput.",
    "Historical diagnostic evidence only. Corrected symmetric-preflight comparisons are required."
  ],
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        "pairs": 5,
        "heap": "2 GiB",
        "parallelism": 1,
        "production_ipc": true,
        "both_transposes": true,
        "cluster_lifetime": "per job",
        "boundary": "complete executeSql(insert).await; cluster boot/config outside clock"
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      "raw_case_logs": [
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        "jvm-aggregate-copying-isolated-flink118-bigint-low-2026-10-16.log.gz",
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        "jvm-aggregate-copying-isolated-flink118-string-medium-2026-10-16.log.gz"
      ]
    }
  ],
  "fixture_method": "v1: only native explains before the clock; stock preflight is asymmetric",
  "admission": "Historical diagnostic evidence only. Corrected symmetric-preflight comparisons are required."
}