{
  "schema_version": 1,
  "date": "2026-10-23",
  "purpose": "Released legacy Table API wrapper coverage through the existing managed-state runtime; no acceleration claim.",
  "environment": {
    "cpu": "Intel Core i7-12650H",
    "logical_cpus": 16,
    "os": "Linux WSL2",
    "jdk": "OpenJDK 17.0.20.1",
    "flink": "2.2.1",
    "parallelism": 1,
    "heap": "2 GiB",
    "native": "release/mimalloc, full RocksDB; unchanged native sources and ABI",
    "zero_copy_local": false
  },
  "method": {
    "input_rows": 262144,
    "keys": 64,
    "batch_rows": 1024,
    "warmup_pairs": 2,
    "measured_pairs": 5,
    "order": "alternating engine order",
    "previous_revision": "1bd9daa8d75586424f3a5d9ad7acc14d600baffb",
    "previous_production_unchanged": true,
    "boundary": "Runtime row source, both transposes, native exchange, generated legacy WeightedAverage callbacks, managed POJO accumulator and DISTINCT membership, count, blackhole row sink. Symmetric untimed explain, planning/submission timed. No concurrent local builds/tests/timings.",
    "native_execution": "candidate asserts consumed NativeJvmGroup work; previous production asserts full fallback and zero substitutions"
  },
  "candidate_source_sha256": {
    "src/main/java/tech/streamfusion/planner/JvmGroupAggregateMatcher.java": "6dc21712091be641a010047e1b5c78c6bd5215c6944c4eb3960af50bad785190",
    "src/test/java/tech/streamfusion/FlinkLegacyJvmAggregateSqlHarnessTest.java": "332a73a8546d36c5d0003a6798cc239247762c6f4cc3ba8f6b03c442886ffcaf",
    "src/test/java/tech/streamfusion/JvmFunctionContractsBenchmark.java": "bb47405479e3d854f1ae5fd826429dcdf959fcaf04ec84d850472b97abe5cb7b"
  },
  "trials": {
    "candidate": [
      {
        "engine": "stock",
        "trial": 0,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.983742
      },
      {
        "engine": "native",
        "trial": 0,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.597737
      },
      {
        "engine": "native",
        "trial": 1,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.426039
      },
      {
        "engine": "stock",
        "trial": 1,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.338115
      },
      {
        "engine": "stock",
        "trial": 2,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.332792
      },
      {
        "engine": "native",
        "trial": 2,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.383554
      },
      {
        "engine": "native",
        "trial": 3,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.312433
      },
      {
        "engine": "stock",
        "trial": 3,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.308067
      },
      {
        "engine": "stock",
        "trial": 4,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.281323
      },
      {
        "engine": "native",
        "trial": 4,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.296346
      },
      {
        "engine": "native",
        "trial": 5,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.306032
      },
      {
        "engine": "stock",
        "trial": 5,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.276203
      },
      {
        "engine": "stock",
        "trial": 6,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.271881
      },
      {
        "engine": "native",
        "trial": 6,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.283084
      }
    ],
    "previous": [
      {
        "engine": "stock",
        "trial": 0,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.961853
      },
      {
        "engine": "native",
        "trial": 0,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.506458
      },
      {
        "engine": "native",
        "trial": 1,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.353747
      },
      {
        "engine": "stock",
        "trial": 1,
        "warmup": true,
        "rows": 262144,
        "seconds": 0.328367
      },
      {
        "engine": "stock",
        "trial": 2,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.302173
      },
      {
        "engine": "native",
        "trial": 2,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.297426
      },
      {
        "engine": "native",
        "trial": 3,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.291673
      },
      {
        "engine": "stock",
        "trial": 3,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.317088
      },
      {
        "engine": "stock",
        "trial": 4,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.285709
      },
      {
        "engine": "native",
        "trial": 4,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.284807
      },
      {
        "engine": "native",
        "trial": 5,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.267108
      },
      {
        "engine": "stock",
        "trial": 5,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.204406
      },
      {
        "engine": "stock",
        "trial": 6,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.277136
      },
      {
        "engine": "native",
        "trial": 6,
        "warmup": false,
        "rows": 262144,
        "seconds": 0.200943
      }
    ]
  },
  "limits": [
    "Short complete jobs include startup/JIT variation; not sustained throughput.",
    "Preceding runtime runs in a separate process, with separately paired stock controls.",
    "Legacy admission changes planner recognition and reuses the existing managed-state function implementation. No optimization or speedup is claimed."
  ],
  "validation": {
    "flink_2.2": {
      "legacy_cases": 4,
      "modifier_cases": 9,
      "failures": 0,
      "skips": 0
    },
    "flink_1.18": {
      "legacy_cases": 4,
      "modifier_cases": 9,
      "failures": 0,
      "skips": 2
    },
    "recovery": "Both heap and native RocksDB, zero/positive retention, two forced restores for each scenario."
  }
}