{
  "issue": 638,
  "baseline_commit": "e1d71357c3240b99e944d141aa2fe0fe6afd16f0",
  "environment": {
    "cpu": "Apple M4",
    "physical_memory_bytes": 17179869184,
    "os": "macOS-15.3.1-arm64-arm-64bit-Mach-O",
    "jdk": "17.0.17",
    "flink": "2.2.1",
    "paimon_java": "2.1.0",
    "paimon_rust": "0.4.0",
    "native_profile": "release with mimalloc, codegen-units=1",
    "jvm_heap_bytes": 2147483648,
    "active_processors": 2,
    "available_task_budget_bytes": 1073741824,
    "background_load": "Spotlight consumed approximately one CPU core during the final runs; do not compare absolute times with pilots."
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    "measured_trials_per_engine": 5,
    "ordering": "Rotating stock / previous / proposed",
    "input": "Two native-written zstd Parquet files: 128 rows plus 16384 or 49152 rows; unique 1024-byte ASCII strings, null every 499 rows, three partition strings; dictionary disabled.",
    "timer": "Complete rewrite including preflight, reader/runtime/JNI, host FileIO, native memory admission, encode and rolling-writer close. Table-writer object construction, fixture creation, full output verification and cleanup excluded.",
    "verification": "Every content value, null, multiplicity, partition field, file row count, sequence and statistics; positive native groups and parquet-rs footer witnesses with zero fallback for proposed; expected route for previous.",
    "scope": "Local-file rewrite diagnostics, including optional synthetic per-stream-read latency; no complete-job, remote-I/O, RSS or CPU-efficiency claim."
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