{
  "issue": 425,
  "date": "2026-10-22",
  "baseline": "07fbffcaa09402bce0a36ff9b3f18a5b8703cb9b",
  "baseline_reader_sha256": "e0def8b2d753905cb6a7971100f7abe2075ab320ef27ca267f443c736a5722e6",
  "candidate_reader_sha256": "c433dc3cc5052678a6ebd6e2300b9cfb117f8eb4d268347fd620a2cba4e937b0",
  "native_library_sha256": "d6ea59662b718a668eec0091cf2090269e2f663931a88adc19893441c12b120e",
  "environment": {
    "cpu": "Intel Core i7-12650H, 16 logical CPUs",
    "os": "Linux x86_64 under WSL2",
    "jdk": "OpenJDK 17.0.20.1",
    "java_heap": "2 GiB",
    "native_build": "release, mimalloc, no default features (no RocksDB)",
    "native_build_command": "cargo build --release --no-default-features --features mimalloc -p streamfusion",
    "parallelism": 1,
    "batch_rows": 1024,
    "zero_copy_local_exchange": false
  },
  "method": {
    "benchmark": "TypedTableFunctionBenchmark",
    "rows": 2000000,
    "shape": "project",
    "warmup_pairs": 2,
    "measured_pairs": 5,
    "order": "Alternating stock and StreamFusion within each pair",
    "preflight": "EXPLAIN outside timing for both engines",
    "boundary": "Complete executeSql/await jobs, runtime RowData source, both transposes, synchronous mutable-output JVM table function, production IPC and row blackhole sink",
    "controls": "Actual preceding Java source and candidate use the same release native library and benchmark fixture; each separate JVM has its own paired stock control",
    "limitations": "Separate JVM controls drift. These short jobs include startup/planning and do not isolate kernel cost. Profiling durations are excluded from throughput results. A slowdown relative to stock is retained under the accepted UDF performance exception."
  },
  "profiles": [
    {
      "version": "baseline",
      "profiler": "async-profiler 4.6, CPU 1 ms and allocation 512 KiB",
      "rows_per_type": 5000000,
      "types": [
        "DECIMAL(18,8)",
        "DECIMAL(38,18)",
        "TIMESTAMP_LTZ(9)"
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      "warmup_pairs": 1,
      "measured_pairs": 1,
      "capture_and_analysis_limit_seconds": 600,
      "note": "Mixed whole-JVM capture filtered to stacks containing NativeColumnarTableFunctionOperator. Inclusive frame counts overlap; allocation weight is not copied bytes. Initial output overwritten by a separate empty ORC fork was discarded; the retained capture uses the single surefire:test goal and a PID-specific filename.",
      "events": {
        "cpu": {
          "unit": "CPU samples",
          "native_pipeline_inclusive_total": 6706,
          "inclusive_by_frame": {
            "ArrowDecimalColumnVector": 978,
            "getBigDecimalFromArrowBuf": 776,
            "DecimalAccessor": 293,
            "DecimalWriter": 264,
            "ArrowToRowDataOperator": 2721,
            "RowDataSerializer": 1674,
            "TimestampAccessor": 143,
            "BigInteger": 484,
            "toByteArray": 29,
            "allocateNew": 244
          }
        },
        "alloc": {
          "unit": "sampled allocation weight, bytes",
          "native_pipeline_inclusive_total": 18304466944,
          "inclusive_by_frame": {
            "ArrowDecimalColumnVector": 6604980224,
            "getBigDecimalFromArrowBuf": 5310513152,
            "DecimalAccessor": 1482686464,
            "DecimalWriter": 190316544,
            "ArrowToRowDataOperator": 10525081600,
            "RowDataSerializer": 7193755648,
            "TimestampAccessor": 513277952,
            "BigInteger": 2559049728,
            "toByteArray": 86507520,
            "allocateNew": 78118912
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  ],
  "timeboxed_decisions": [
    {
      "candidate": "Decimal Arrow reads",
      "decision": "Retain one sign-extension-checked long-read prototype; compact and wide declared precision are covered."
    },
    {
      "candidate": "Wide values outside signed long",
      "decision": "Skip after the initial profile; retain released Arrow reconstruction rather than redesigning BigInteger conversion."
    },
    {
      "candidate": "Temporal and owned exit copies",
      "decision": "Skip after the initial profile; no comparably small change identified, and generated binary exits were already rejected."
    }
  ],
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  ],
  "focused_validation": {
    "Flink 2.2.1/JDK17": {
      "tests": 87,
      "failures": 0,
      "errors": 0,
      "skips": 0
    },
    "Flink 1.18.1/JDK17": {
      "tests": 87,
      "failures": 0,
      "errors": 0,
      "skips": 0
    },
    "scope": [
      "DecimalAccessorTest",
      "FlinkTypedTableFunctionSqlHarnessTest (fanout, rounding/overflow, empty/filtered input, disabled fallback, TIME failure)",
      "FlinkDecimalUdfConsumersSqlHarnessTest",
      "FlinkWideDecimalTimestampSqlHarnessTest",
      "FlinkDecimalOverflowSqlHarnessTest",
      "RowDataArrowConverterTest"
    ],
    "limitation": "Focused local selection excludes the typed table-function RocksDB recovery method because this release library disables RocksDB; full required CI remains mandatory before merge."
  }
}