{
  "date": "2026-11-04",
  "base": "0f5fc16796d6e7882e34722435480320a25434dd",
  "previous_head": "bbada54b0d4f6395f06943442f6ed0867a90416f",
  "platform": "Apple M4 Pro, macOS arm64, one thread",
  "jdk": "17.0.12",
  "java_release": 11,
  "flink_versions": [
    "1.18.1",
    "2.2.1"
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  "performance_flink": "2.2.1",
  "build": "release --no-default-features --features mimalloc",
  "scope": "Direct released built-in CHAR_LENGTH/CHARACTER_LENGTH over the already-qualified primitive ASCII PRINTF. Preserve operator identity, full primitive producer proof and all generic Unicode/representation guards. Java admission only; no native rebuild or transport change.",
  "method": {
    "rows_per_trial": 131072,
    "warmups": 16,
    "measurements": 9,
    "bulk_batch": 1024,
    "tiny_batch": 16,
    "input": "Equal prepared GenericRowData/BinaryRowData and Arrow; both NULL modes; signed INT/BIGINT extrema, BOOLEAN/mixed INT and DECIMAL(4,2)/DECIMAL(38,18) truth/comparisons; literal padded/indexed formats.",
    "native_timer": "Starts/stops inside Rust after import and before export, retaining production Calc, output consumption, allocation, conversions and intrinsic callbacks. Initial JNI/import/export and perimeter transposes are outside this prepared operation only.",
    "previous": "The actual preceding encoder/helper from bbada54b runs the identical fixture/data/JDK on its saved whole DSO/executable. The candidate native artifacts are byte-identical because this extension changes Java admission only. Both runtime paths require consumed operations; only the new route requires empty evaluators.",
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    },
    "24": {
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      ],
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    },
    "25": {
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    },
    "26": {
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      ],
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      ]
    },
    "27": {
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      ],
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      ]
    },
    "28": {
      "candidate": [
        "NATIVE_ALLOCATION,\"integral_expression\",42,3356,0,64"
      ],
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      ]
    },
    "29": {
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    }
  },
  "limitations": [
    "PRINTF exists only on released Flink 2.2; 1.18 SQL rejection remains outside the native backlog.",
    "Format <=512 ASCII characters, width/precision <=256; actual argument-specific JDK validation and index-zero rejection remain. Other formats/argument families retain preceding routes.",
    "Only a direct built-in length consumer of an already-qualified primitive formatter is admitted. Custom same-name functions, non-ASCII/dynamic/invalid formats, character conversions, unverified producers and all other representation/relational guards retain prior behavior.",
    "Complete-job measurements retain all slower/overlapping cases; prepared gains do not establish universal job acceleration.",
    "This extension has focused local JVM verification; full hosted suites must qualify the exact pushed head separately."
  ]
}