{
  "date": "2026-10-16",
  "baseline_commit": "b170a474d5658330ed7e92e9b8bcc54117c8d287",
  "machine": "Apple M4 Pro, 24 GiB RAM, macOS 26.5",
  "jdk": "17",
  "flink": "2.2.1 (released)",
  "native_profile": "release, default features, system allocator",
  "heap": "8 GiB",
  "parallelism": 1,
  "warmup": 2,
  "measured_runs": 5,
  "null_every": 7,
  "mini_batch_rows": 1024,
  "mini_batch_latency": "1 h",
  "shuffle": "Arrow IPC (bench profile)",
  "measured_boundary": "Complete row-source/blackhole job; submission, conversion, JNI, native state, output and completion included. MiniCluster creation excluded.",
  "ordering": "Alternating engine order per trial",
  "baseline": "Unmodified baseline planner; native-enabled runs assert zero substitutions; identical benchmark source and release native payload",
  "records": [
    {
      "stage": "initial-generated-prototype",
      "case": "CHAR8_DOUBLE",
      "rows": 2000000,
      "keys": 64,
      "native_expected": true,
      "backend": "memory",
      "stock_median_seconds": 0.411758,
      "streamfusion_median_seconds": 0.494686,
      "stock_trials_seconds": [
        0.407827,
        0.419551792,
        0.411758208,
        0.40333575,
        0.459455625
      ],
      "streamfusion_trials_seconds": [
        0.50675825,
        0.480019208,
        0.494685625,
        0.499430167,
        0.474219833
      ]
    },
    {
      "stage": "baseline",
      "case": "CHAR8_DOUBLE",
      "rows": 2000000,
      "keys": 64,
      "native_expected": false,
      "backend": "memory",
      "stock_median_seconds": 0.397853,
      "streamfusion_median_seconds": 0.402268,
      "stock_trials_seconds": [
        0.3970115,
        0.408022083,
        0.393651708,
        0.402885791,
        0.397853
      ],
      "streamfusion_trials_seconds": [
        0.402268042,
        0.398966083,
        0.396043083,
        0.402410125,
        0.404538292
      ]
    },
    {
      "stage": "candidate",
      "case": "CHAR8_DOUBLE",
      "rows": 2000000,
      "keys": 64,
      "native_expected": true,
      "backend": "memory",
      "stock_median_seconds": 0.458194,
      "streamfusion_median_seconds": 0.519314,
      "stock_trials_seconds": [
        0.472621667,
        0.455663625,
        0.458194208,
        0.461622916,
        0.456798917
      ],
      "streamfusion_trials_seconds": [
        0.532474042,
        0.520877583,
        0.518855041,
        0.519313917,
        0.515030875
      ]
    }
  ],
  "candidate_configuration": "table.exec.legacy-cast-behaviour=ENABLED; streamfusion.calc.legacyNumericCasts.enabled=true (default false)",
  "admission": "Opt-in compatibility groundwork; standalone regression prevents default admission.",
  "off_heap_accounting_budget": "48 GiB in the shared fixture for both engines; not a reservation or measured resident usage"
}