{
  "date": "2026-10-23",
  "purpose": "Correctness-enabling JVM table-function Java conversion contracts; no acceleration claim.",
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            {
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            {
              "engine": "stock",
              "trial": 6,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.144182
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            {
              "engine": "native_enabled_fallback",
              "trial": 6,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.141647
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          ]
        },
        {
          "case": "JVM_TABLE_CONVERSION_list:STRING",
          "rows": 262144,
          "stock": {
            "samples_seconds": [
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            "median_seconds": 0.252955684,
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          "native_enabled": {
            "samples_seconds": [
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            "median_seconds": 0.25092763,
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          "trials": [
            {
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              "rows": 262144,
              "seconds": 0.310515
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            {
              "engine": "native_enabled_fallback",
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            {
              "engine": "native_enabled_fallback",
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              "rows": 262144,
              "seconds": 0.259398
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            {
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              "warmup": true,
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              "seconds": 0.245979
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            {
              "engine": "stock",
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            {
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              "warmup": false,
              "rows": 262144,
              "seconds": 0.250928
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            {
              "engine": "native_enabled_fallback",
              "trial": 3,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.256841
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            {
              "engine": "stock",
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              "rows": 262144,
              "seconds": 0.250436
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            {
              "engine": "stock",
              "trial": 4,
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              "rows": 262144,
              "seconds": 0.267736
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            {
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              "warmup": false,
              "rows": 262144,
              "seconds": 0.244113
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            {
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              "rows": 262144,
              "seconds": 0.245681
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            {
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              "rows": 262144,
              "seconds": 0.247633
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            {
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              "trial": 6,
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              "rows": 262144,
              "seconds": 0.252956
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            {
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              "rows": 262144,
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          ]
        },
        {
          "case": "JVM_TABLE_CONVERSION_list:DECIMAL(38,18)",
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          "stock": {
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            "median_seconds": 0.266992668,
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          "native_enabled": {
            "samples_seconds": [
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            "median_seconds": 0.262011525,
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          "trials": [
            {
              "engine": "stock",
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              "warmup": true,
              "rows": 262144,
              "seconds": 0.312967
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            {
              "engine": "native_enabled_fallback",
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            {
              "engine": "native_enabled_fallback",
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              "rows": 262144,
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            {
              "engine": "stock",
              "trial": 1,
              "warmup": true,
              "rows": 262144,
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            {
              "engine": "stock",
              "trial": 2,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.266899
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            {
              "engine": "native_enabled_fallback",
              "trial": 2,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.259889
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            {
              "engine": "native_enabled_fallback",
              "trial": 3,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.26093
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            {
              "engine": "stock",
              "trial": 3,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.266993
            },
            {
              "engine": "stock",
              "trial": 4,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.257866
            },
            {
              "engine": "native_enabled_fallback",
              "trial": 4,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.262012
            },
            {
              "engine": "native_enabled_fallback",
              "trial": 5,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.266754
            },
            {
              "engine": "stock",
              "trial": 5,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.268333
            },
            {
              "engine": "stock",
              "trial": 6,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.269564
            },
            {
              "engine": "native_enabled_fallback",
              "trial": 6,
              "warmup": false,
              "rows": 262144,
              "seconds": 0.26292
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          ]
        }
      ]
    }
  ],
  "limits": [
    "Short complete-job measurements include startup and JIT variability; they do not establish sustained throughput.",
    "Prior production runs in a separate JVM with its own stock controls; ranges and all trials remain visible.",
    "No builds or tests from this goal overlap timings. Other local Java activity was sampled once per second; this is not an exclusive CPU reservation.",
    "Slower verified UDF coverage follows the accepted maintainer performance exception."
  ],
  "bounded_profile": {
    "profile_passes": 1,
    "optimization_passes": 0,
    "flink_version": "2.2.1",
    "case": "list:STRING",
    "rows": 1048576,
    "warmup_pairs": 1,
    "profiled_measured_pairs": 1,
    "timings_excluded_from_performance_matrix": true,
    "all_execution_and_native_samples": 916,
    "native_table_function_samples": 28,
    "operator_leaf_samples": {
      "ColumnarJvmTableFunction$12.processElement": 5,
      "tech.streamfusion.arrow.writers.ArrayWriter$ArrayWriterForRow.isNullAt": 3,
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator$1.collect": 3,
      "tech.streamfusion.FlinkTableFunctionConversionSqlHarnessTest.scalar": 3,
      "tech.streamfusion.arrow.writers.IntWriter.doWrite": 3,
      "tech.streamfusion.arrow.writers.IntWriter$IntWriterForRow.isNullAt": 3,
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator.processElement": 2,
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator.append": 2,
      "tech.streamfusion.FlinkTableFunctionConversionSqlHarnessTest$MutatingRows.eval": 1,
      "tech.streamfusion.arrow.writers.ArrayWriter.doWrite": 1,
      "tech.streamfusion.arrow.writers.ArrowFieldWriter.write": 1,
      "tech.streamfusion.arrow.ArrowWriter.write": 1
    },
    "operator_inclusive_samples": {
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator.append": 14,
      "tech.streamfusion.arrow.ArrowWriter.write": 12,
      "org.apache.flink.streaming.runtime.io.RecordProcessorUtils$$Lambda$3151+0x00007f62d4daa5f8.924548271.accept": 11,
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator.processElement": 11,
      "tech.streamfusion.arrow.writers.ArrowFieldWriter.write": 11,
      "tech.streamfusion.operator.NativeColumnarTableFunctionOperator$1.collect": 11,
      "ColumnarJvmTableFunction$12.processElement": 9,
      "org.apache.flink.streaming.runtime.tasks.ChainingOutput.pushToOperator": 8,
      "org.apache.flink.streaming.runtime.tasks.ChainingOutput.collect": 7,
      "org.apache.flink.table.runtime.util.StreamRecordCollector.collect": 6,
      "tech.streamfusion.arrow.writers.IntWriter.doWrite": 6,
      "org.apache.flink.table.runtime.collector.TableFunctionCollector.outputResult": 5,
      "tech.streamfusion.arrow.writers.ArrayWriter.doWrite": 4,
      "tech.streamfusion.FlinkTableFunctionConversionSqlHarnessTest$MutatingRows.eval": 4,
      "tech.streamfusion.arrow.writers.ArrayWriter$ArrayWriterForRow.isNullAt": 3,
      "StreamExecCorrelate$12$TableFunctionCollector$2.collect": 3,
      "tech.streamfusion.FlinkTableFunctionConversionSqlHarnessTest.scalar": 3,
      "tech.streamfusion.arrow.writers.IntWriter$IntWriterForRow.isNullAt": 3
    },
    "limits": [
      "A single short profile gives diagnostic samples, not precise CPU attribution or a speedup measurement."
    ],
    "recording_sha256": "63a66ae8fd06f8d170d2e2cd709e8456f47ab2209107f5995b5c3f0ce5eefa17",
    "observation": "Generated JVM callbacks and immediate owned Arrow output appear in the 28 operator samples. No easy safe improvement was established; the investigation stopped after one profile without an optimization change."
  },
  "validation": {
    "flink_2.2.1_jdk17": {
      "new_conversion_cases": 47,
      "existing_nested_cases": 61,
      "existing_typed_cases": 64,
      "failures": 0
    },
    "flink_1.18.1_jdk17": {
      "new_conversion_cases": 47,
      "existing_nested_cases": 61,
      "existing_typed_cases": 64,
      "failures": 0
    },
    "required_ci": "Both unchanged upstream Flink suites and the complete CI matrices must pass on the PR head before merge."
  },
  "released_reference_sources": [
    "https://repo.maven.apache.org/maven2/org/apache/flink/flink-table-common/2.2.1/flink-table-common-2.2.1-sources.jar",
    "https://repo.maven.apache.org/maven2/org/apache/flink/flink-table-runtime/2.2.1/flink-table-runtime-2.2.1-sources.jar",
    "https://repo.maven.apache.org/maven2/org/apache/flink/flink-table-common/1.18.1/flink-table-common-1.18.1-sources.jar",
    "https://repo.maven.apache.org/maven2/org/apache/flink/flink-table-runtime/1.18.1/flink-table-runtime-1.18.1-sources.jar"
  ]
}