{
  "date": "2026-10-16",
  "base_pr_commit": "5f90daa77af2de950e6e0228e5247a5d56b84ab2",
  "implementation": "Conservative native numeric cast batch kernels with released Flink evaluation for all other batches; no additional configuration",
  "environment": {
    "cpu": "Apple M4 Pro",
    "ram_gib": 24,
    "os": "macOS 26.5",
    "flink": "2.2.1",
    "jdk": 17,
    "rust_profile": "release",
    "allocator": "system",
    "parallelism": 1,
    "heap_gib": 8,
    "off_heap_accounting_budget_gib": 48,
    "off_heap_note": "Accounting budget shared by both engines, not resident memory or a reservation"
  },
  "boundary": "Complete bounded runtime Row source to rowwise blackhole, retaining both transposes and JNI, execution metrics and job completion; the optimized batches eliminate the scalar JVM upcall",
  "method": {
    "warmup_jobs_per_engine": 2,
    "measured_jobs_per_engine": 5,
    "order": "alternating each trial",
    "null_every": 7
  },
  "baselines": [
    "legacy-floating-decimal-trials-2026-10-16.json",
    "legacy-char-double-trials-2026-10-16.json"
  ],
  "limits": "Same-run stock ratios are primary. Previous implementation and previous-planner fallback samples are separate runs with their own stock controls. No speedup is claimed for batches requiring the JVM evaluator, other machines or persistent backends.",
  "runs": [
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      "profile": "default-cardinality",
      "rows": 2000000,
      "char_length": 8,
      "cases": [
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          "input_cardinality": 1000,
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          "stock_over_native": 1.1686357141378896
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        {
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          "input_cardinality": 9999,
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        {
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      "all_trials_including_warmup": [
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    {
      "profile": "high-cardinality",
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}