{
  "date": "2026-11-09",
  "query": 6,
  "scale": 1,
  "method": "Separate verification-mode JFR profile for stock and native. Not a throughput measurement; sampling perturbs execution.",
  "interpretation": "CSV parsing/date conversion and row-to-Arrow writing are prominent. Native aggregate/JNI is a small part of sampled stacks. Counts overlap and include native blocked calls, so they are not percentages of CPU or wall time.",
  "profiles": {
    "stock": {
      "samples": 1326,
      "categoriesOverlapping": {
        "csv": 275,
        "decimal": 37
      },
      "topFrames": [
        [
          "sun.nio.ch.Net.accept",
          264
        ],
        [
          "sun.nio.ch.KQueue.poll",
          264
        ],
        [
          "java.io.FileInputStream.readBytes",
          141
        ],
        [
          "org.apache.flink.shaded.jackson2.com.fasterxml.jackson.dataformat.csv.impl.CsvDecoder.nextString",
          86
        ],
        [
          "org.apache.flink.shaded.jackson2.com.fasterxml.jackson.dataformat.csv.impl.CsvDecoder.loadMore",
          71
        ],
        [
          "BatchExecCalc$24.processElement_split23",
          61
        ],
        [
          "org.apache.flink.streaming.api.operators.SourceOperator.emitNext",
          47
        ],
        [
          "java.lang.StringLatin1.hashCode",
          41
        ],
        [
          "sun.util.calendar.ZoneInfo.getTransitionIndex",
          40
        ],
        [
          "sun.util.calendar.BaseCalendar.isLeapYear",
          27
        ],
        [
          "java.util.LinkedHashMap.newNode",
          26
        ],
        [
          "java.math.BigDecimal.<init>",
          24
        ]
      ]
    },
    "native": {
      "samples": 1218,
      "categoriesOverlapping": {
        "csv": 219,
        "nativeJNI": 6,
        "arrow": 170,
        "decimal": 95,
        "transpose": 109
      },
      "topFrames": [
        [
          "sun.nio.ch.Net.accept",
          230
        ],
        [
          "sun.nio.ch.KQueue.poll",
          230
        ],
        [
          "java.io.FileInputStream.readBytes",
          123
        ],
        [
          "tech.streamfusion.arrow.ArrowWriter.write",
          106
        ],
        [
          "org.apache.flink.shaded.jackson2.com.fasterxml.jackson.dataformat.csv.impl.CsvDecoder.nextString",
          90
        ],
        [
          "org.apache.arrow.vector.util.DecimalUtility.writeLongToArrowBuf",
          64
        ],
        [
          "org.apache.flink.shaded.jackson2.com.fasterxml.jackson.dataformat.csv.impl.CsvDecoder.loadMore",
          50
        ],
        [
          "java.lang.StringLatin1.hashCode",
          45
        ],
        [
          "sun.util.calendar.BaseCalendar.isLeapYear",
          41
        ],
        [
          "java.util.LinkedHashMap.newNode",
          26
        ],
        [
          "java.math.BigDecimal.<init>",
          24
        ],
        [
          "sun.util.calendar.ZoneInfo.getTransitionIndex",
          23
        ]
      ]
    }
  }
}