{
  "schema_version": 1,
  "baseline_revision": "96f98a32",
  "candidate": "zero-property legacy group-window buffer transfer; property-bearing outputs retain baseline copies",
  "environment": {
    "jdk": "OpenJDK 17",
    "flink": "2.2.1",
    "native_build": "release",
    "cpu": "12th Gen Intel Core i7-12650H",
    "logical_cpus": 16
  },
  "methodology": {
    "paired_shaping": "Identical current fixtures copied into detached baseline; 20 warmups and 31 observations, all 5 shapes, 3 sizes, both 0 and 2 window properties; setup/validation outside timing.",
    "full_flush": "Production native aggregation flush plus C Data import and Java shaping; warmup3 observations9.",
    "complete_jobs": "262144 input rows,65536 output groups, parallelism2 ONE_PHASE; stock/native alternate order, warmup2 observations5; collect Row copies inside timing, validation outside.",
    "limitations": [
      "Paired means matching fixtures and worktrees, not interleaved baseline/candidate executions.",
      "Complete-job BIGINT stock and native both drift across baseline/candidate runs; raw native change is not causal evidence.",
      "Some shapes/properties regress; retain raw samples and use workload-specific results.",
      "Delta cleanup failures in paired logs occurred outside window classes and do not invalidate their completed fixtures.",
      "BIGINT and NULLABLE_BIGINT shaping fixtures both use BIGINT keys and identical every-fifth-row-null result values; their labels are repeated execution-order controls, not distinct dtype paths.",
      "Narrowed shaping after and both zero-property complete-job runs overlap external Fluss load and are provisional contended measurements. Structural buffer-sharing validation remains valid; numerical comparisons require a quiet-host rerun.",
      "Final accepted pair ran with external background workloads under explicit user authorization. Historical quiet-host rerun requirements describe earlier provisional runs; final accepted pair is the recorded comparison with background variance limits."
    ],
    "commands": {
      "paired_shaping": "SF_BENCHMARK=true mvn -pl streamfusion-runtime -am test -Pbench -Dtest=WindowOutputShapingBenchmark -Dsurefire.failIfNoSpecifiedTests=false -Dshaping.warmup=20 -Dshaping.runs=31",
      "full_flush": "SF_BENCHMARK=true mvn -pl streamfusion-runtime -am test -Pbench -Dtest=WindowOutputHandoffBenchmark -Dsurefire.failIfNoSpecifiedTests=false -Dhandoff.warmup=3 -Dhandoff.runs=9",
      "complete_job": "SF_BENCHMARK=true mvn -pl streamfusion-runtime -am test -Pbench -Dtest=WindowOutputHandoffJobBenchmark -Dsurefire.failIfNoSpecifiedTests=false -Dhandoff.job.rows=262144 -Dhandoff.job.groups=65536 -Dhandoff.job.warmup=2 -Dhandoff.job.runs=5",
      "flink_1_18_variant": "Replace -Pbench with -Pflink-1.18,bench; recorded measurements here use Flink2.2.1.",
      "jdk": "Use JDK17 consistently for baseline and candidate; use the same release native libraries.",
      "final_shaping": "SF_BENCHMARK=true mvn -pl streamfusion-runtime -am test -Pbench -Dtest=WindowOutputShapingBenchmark -Dsurefire.failIfNoSpecifiedTests=false -Dshaping.warmup=100 -Dshaping.runs=31",
      "legacy_complete_job": "SF_BENCHMARK=true mvn -pl streamfusion-runtime -am test -Pbench -Dtest=WindowOutputHandoffJobBenchmark -Dsurefire.failIfNoSpecifiedTests=false -Dhandoff.job.rows=262144 -Dhandoff.job.groups=65536 -Dhandoff.job.warmup=2 -Dhandoff.job.runs=5 -Dhandoff.job.properties=0"
    },
    "final_shaping": "Full matching 30-case matrix repeated with 100 warmups and 31 observations per case, default tiered compiler; all 1860 raw observations retained alongside short-warmup and ABBA controls.",
    "narrowed_candidate": "Only properties=0 transfers buffers; property-bearing outputs retain original allocation/copy/conversion loops. Earlier all-transfer runs are historical rejected candidates.",
    "accepted_final": "Final recorded pair: matching fixtures,100 warmups/31 shaping observations,2 warmups/5 complete-job observations per engine,both phases frozen baseline release Rust libraries. Background workloads explicitly accepted by user; no statistical confidence claim."
  },
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  }
}
