{
  "date": "2026-11-04",
  "base": "0f5fc16796d6e7882e34722435480320a25434dd",
  "previous_head": "40f26521dfbe1c6b40829127b2dc32c37e822a6d",
  "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 six-way built-in comparison of qualified primitive ASCII PRINTF results with another qualified result or an ASCII/NULL character literal, including native filtering. At least one formatter is required. Preserve operator identity, full producer proof and all other Unicode/representation guards. Java admission only, no runtime 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": "Replay the actual preceding 40f26521 encoder/helper. Equality/inequality keep the previous native Calc with generated evaluator on the saved whole runtime. Ordered prepared controls verify the actual previous stock fallback and exact reason string representation before Arrow is not proven Java-backed, then measure released generated Flink on prepared RowData. These use the existing fallback-control fixture and do not fabricate a native callback route for a rejected signature. The candidate DSO/executable remain byte-identical to the saved runtime. Candidate requires consumed work and empty evaluators.",
    "pipeline": "Four million-row bounded external Row sources to blackhole jobs, one thread, two warmups and five alternating stock/native measurements. The external source proves Java-backed inputs to the previous planner, so ordered complete jobs retain actual native Calc with generated evaluator; this differs from the conservative prepared/internal-source fallback above. Both candidate and previous require consumed native work; candidate additionally requires empty evaluators. Job submission/startup, JNI and both RowData/Arrow transposes remain; surrounding JVM startup and setup are outside the timer."
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    "18": {
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    "19": {
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    "20": {
      "candidate": [
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      "previous": [
        "PREVIOUS_FALLBACK,string representation before Arrow is not proven Java-backed"
      ]
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    "21": {
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        "PREVIOUS_FALLBACK,string representation before Arrow is not proven Java-backed"
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    },
    "22": {
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        "PREVIOUS_FALLBACK,string representation before Arrow is not proven Java-backed"
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    "23": {
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    "24": {
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    },
    "25": {
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    "26": {
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    "27": {
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    "28": {
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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 direct built-in comparisons with both operands proven ASCII are admitted, including an explicitly NULL literal. At least one operand is a qualified primitive formatter. Arbitrary STRING fields, non-ASCII literals, unverified/dynamic/invalid formatters, character conversions, other consumers and relational boundaries 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."
  ]
}