{
  "date": "2026-10-16",
  "issue": 237,
  "base_revision": "5cbd6ec2bfe9a40bba59a861abc2b30063b5bb56",
  "admitted": false,
  "configuration": {
    "java": "17",
    "build": "release with mimalloc",
    "rows": 500000,
    "keys": 16384,
    "width": 256,
    "text_cardinality": 1,
    "parallelism": 1,
    "heap": "2 GiB",
    "warmup_pairs": 2,
    "measured_pairs": 3,
    "native_input_rows_per_recording": 2500000,
    "production_ipc": true,
    "both_transposes": true,
    "profiler": "async-profiler 4.0 cpu-clock 2ms DWARF, Java allocations 1MiB"
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  "limitations": [
    "ALL profile timings excluded: external Java work observed. No throughput or causal CPU speedup claim.",
    "Java allocation samples estimate allocation volume, not copied bytes, retained heap or Rust allocations.",
    "Whole-process profiles include both engines, startup, setup, JIT and warmup. Inclusive stack totals overlap.",
    "Separate numeric-group recordings demonstrate symbolized Rust aggregate/control execution; those Rust costs cannot be assigned to the wide split-only path."
  ],
  "decision": "Retain bounded repeated UTF-8 encoding candidate for isolated throughput validation; admission PENDING.",
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