{
  "date": "2026-11-09",
  "environment": "Same host/release configuration as batch-sort-jobs-20261109.json",
  "timer": "Native Rust timer starts after Arrow import/setup and stops before output export. Includes production input/output compact copies, DataFusion execution, memory callbacks, I/O yields and checksum consumption. Stock Java SortOperator timer starts after generated operator setup and consumes prebuilt copied BinaryRowData.",
  "configuration": {
    "poolBytesPerEngine": 33554432,
    "nullEvery": 17,
    "nativeOutputBatchRows": 1024,
    "warmups": 3,
    "trials": 7,
    "randomSeed": 724719,
    "alternatingEngineOrder": true,
    "types": "all nullable BIGINT",
    "order": "first column ASC NULLS FIRST",
    "verification": "equal row count and key checksum, full row width retained"
  },
  "cohorts": [
    {
      "stage": "final production implementation",
      "rows": 131072,
      "width": 4,
      "cardinality": 131072,
      "stockNanos": [
        38155875,
        29928125,
        29698250,
        29286291,
        29834000,
        28887375,
        28994416
      ],
      "nativeNanos": [
        3498542,
        3545083,
        3415125,
        3385458,
        3322166,
        3328667,
        3276042
      ],
      "medianStockOverNative": 8.772299050822665,
      "validComparison": false,
      "invalidReason": "Different NULL ordering between engines"
    },
    {
      "stage": "final production implementation",
      "rows": 65536,
      "width": 8,
      "cardinality": 127,
      "stockNanos": [
        12264333,
        13620125,
        16000417,
        15426625,
        14930084,
        15536125,
        12508375
      ],
      "nativeNanos": [
        2170542,
        2078000,
        2064500,
        2035083,
        2064500,
        2173042,
        2347291
      ],
      "medianStockOverNative": 7.184833493743985,
      "validComparison": false,
      "invalidReason": "Different NULL ordering between engines"
    },
    {
      "stage": "copy-inclusive before metrics",
      "rows": 131072,
      "width": 4,
      "cardinality": 131072,
      "stockNanos": [
        34576167,
        30024875,
        29804042,
        28708125,
        28193459,
        28649625,
        28833000
      ],
      "nativeNanos": [
        3377625,
        3281167,
        3260583,
        3334084,
        3193375,
        3185625,
        3270250
      ],
      "medianStockOverNative": 8.816757128659889,
      "validComparison": false,
      "invalidReason": "Different NULL ordering between engines"
    }
  ],
  "previousBehavior": "SQL sort previously fell back entirely to stock Flink; there is no previous native SQL sort.",
  "limits": [
    "Operation timing excludes SQL planning, source/sink, shuffle, JNI entry, input import, output export and perimeter transposes",
    "No precise before/after optimization conclusion across host cohorts",
    "Does not establish other key types or forced-spill performance"
  ],
  "fingerprints": {
    "native/engine/src/bounded_sort.rs": "275f995980641cef236d0a5c542bc96e78d07fc25b4fa89a549d13a9cc626c62",
    "native/engine/src/bounded_exec.rs": "c224cfa4c71a1fb98801e9500ccecd184034c385eab2702459cebcb1ddcbbfaf",
    "native/engine/src/memory.rs": "e86d8d3bad07f1445d48499d121467ddcdd205c109c463220c73b5ce957116aa",
    "src/test/java/tech/streamfusion/operator/BatchSortAdmissionBenchmark.java": "9919e3b5b420698fac96aa467a4d1b2b8cd7206ad2342d015cce6ec99e14d172",
    "releaseNativeLibrary": "3938f5ecf3bb9ea550a317308e2ba1e06be313b4b857001fb552658b02922e6d"
  },
  "status": "discarded: stock NULLS LAST versus native NULLS FIRST in the original prepared-sort harness",
  "invalidReason": "Flink SortSpec.addField third argument is nullIsLast, not nullsFirst. These timed comparisons used different NULL orderings. They are excluded from acceleration claims. Full SQL job cohorts are unaffected.",
  "actualNullOrdering": {
    "stock": "ASC NULLS LAST",
    "native": "ASC NULLS FIRST"
  }
}