{
  "date": "2026-10-28",
  "base_main": "5dce7f04341d1652fc3f854482b355c0a1e487ed",
  "previous_commit": "ea0268e57875a399763fcc95d3dd55080a3f8e7f",
  "host": {
    "cpu": "Apple M4 Pro",
    "jdk": 17,
    "rust": "1.94.0",
    "native": "release, no-default-features, system allocator"
  },
  "method": {
    "prepared": "Stock generated code starts on RowData; candidate and actual preceding Calc start on Arrow with Rust timers. Setup, input import, output export and perimeter transposes are outside the small-function timer. Intrinsic JVM callbacks and marshalling remain timed. Equivalent output length/first/last-byte checksums.",
    "previous": "The actual preceding expression encoder is loaded first on the classpath. Character input asserts kind 44, Binary asserts kind 17; both return Arrow Binary. Candidate asserts kind 6/opcode 230 without a callback.",
    "processes": "Current and previous encoders run in separate sequential JVMs, each with its own stock control and rotating two-engine order. Both stock controls and their variability are retained. Speedup uses the smaller stock median.",
    "warmups": 16,
    "measured_trials": 11,
    "schemas": "nullable; actual NULL values every seventh row when enabled",
    "complete_job": "Bounded 1M encoded-STRING rows decoding 16 bytes, parallelism 1, row source and blackhole sink. Both transposes, job submission, JIT and source encoding included. Two warmups and five measured jobs per engine, sequential JVMs. Positive NativeCalc work and evaluator route asserted.",
    "allocation": "One untimed production operation with the counting allocator; requested allocation bytes, not peak retained or copied bytes."
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