{ "environment": { "line": "1.18", "cpu": "12th Gen Intel(R) Core(TM) i7-12650H", "platform": "Linux-6.18.54.1-microsoft-standard-WSL2-x86_64-with-glibc2.35", "java": "openjdk version \"17.0.20.1\" 2026-08-18\nOpenJDK Runtime Environment (build 17.0.20.1+1-1-22.04-Ubuntu)\nOpenJDK 64-Bit Server VM (build 17.0.20.1+1-1-22.04-Ubuntu, mixed mode, sharing)\n", "baseline_java": "d951a83808425f9e7df7c0f6fc3fdb082443885f", "candidate_java": "8a490951 plus generic string exit from f7867f55", "shared_native": "Integrated 717b8d94 release core; affected string/literal kernels unchanged. Same DSO for both Java cohorts, hash retained per record.", "rows": 2000000, "warmup": 2, "runs": 5, "heap": "2 GiB", "parallelism": 1, "method": "Sequential fresh JVMs by cohort/case, alternating stock/native pairs. No detected competing builds/tests; continuous CPU/process/memory/I/O observations retained. Same source/transposes/JNI/row-sink timing boundary as primary." }, "records": [ { "cohort": "previous", "case": "join", "expression": "ARRAY_JOIN(arr,'|','?')", "map_source": false, "type": "STRING", "width": 8, "stock_trials": [ 1.922425103, 1.881036488, 1.926494663, 1.914394953, 1.924500717 ], "native_trials": [ 1.739682314, 1.736155321, 1.705994667, 1.725547084, 1.714202768 ], "route_evidence": [ "[collection-engine] [NativeCalc functions: native=[ARRAY_JOIN], jvm=[]]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=9ad5a97075a1208f56c2a05f703f190f}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=c5bb43449325f1d71128e1d014d64d2f}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=c225bb37e920f013749f574ef887d1e4}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=9296ae3bf9837e61cabe8717319b4516}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=0c35acbd220b2c42cde230356d73b94b}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=c4a1707a735f595735ddb9f018bc9820}]", "[collection-route] [{recordsIn=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') AS v, true AS anchor], nativeFuncti, recordsOut=2000000, subtask=0, attempt=0, jobId=7f36f5a633d0b7a1da81cef9c429090b}]" ], "all_trials": [ "[collection-trial] engine=flink trial=0 warmup=true rows=2000000 seconds=2.679874204", "[collection-trial] engine=native trial=0 warmup=true rows=2000000 seconds=2.090165592", "[collection-trial] engine=native trial=1 warmup=true rows=2000000 seconds=1.781366227", "[collection-trial] engine=flink trial=1 warmup=true rows=2000000 seconds=1.994470680", "[collection-trial] engine=flink trial=2 warmup=false rows=2000000 seconds=1.922425103", "[collection-trial] engine=native trial=2 warmup=false rows=2000000 seconds=1.739682314", "[collection-trial] engine=native trial=3 warmup=false rows=2000000 seconds=1.736155321", "[collection-trial] engine=flink trial=3 warmup=false rows=2000000 seconds=1.881036488", "[collection-trial] engine=flink trial=4 warmup=false rows=2000000 seconds=1.926494663", "[collection-trial] engine=native trial=4 warmup=false rows=2000000 seconds=1.705994667", "[collection-trial] engine=native trial=5 warmup=false rows=2000000 seconds=1.725547084", "[collection-trial] engine=flink trial=5 warmup=false rows=2000000 seconds=1.914394953", "[collection-trial] engine=flink trial=6 warmup=false rows=2000000 seconds=1.924500717", "[collection-trial] engine=native trial=6 warmup=false rows=2000000 seconds=1.714202768" ], "validation": { "cohort": "baseline", "case": "join", "expression": "ARRAY_JOIN(arr,'|','?')", "rows": 2000000, "width": 8, "type": "STRING", "map": false, "warmup": 2, "runs": 5, "command": [ "mvn", "-o", "-q", "-Pbench,flink-1.18", "-pl", "streamfusion-runtime", "surefire:test@default-test", "-Dtest=DynamicCollectionBenchmark", "-Dcollection.expression=ARRAY_JOIN(arr,'|','?')", "-Dcollection.map=false", "-Dcollection.type=STRING", "-Dcollection.width=8", "-Dcollection.rows=2000000", "-Dcollection.warmup=2", "-Dcollection.runs=5", "-Dcollection.bytes=64", "-Dcollection.rustFunction=ARRAY_JOIN", "-Dsf.extraJvmArgs=-Xmx2g" ], "exitCode": 0, "elapsed": 33.24829053878784, "profiled": false, "contaminated": false, "classesSha256": "ca390287c527e44e83ffdc08ada7852e56645c6775dd2e553bdc5047b7c79632", "dsoSha256": "b574f02abc8a286c1f295b6cc1660f9764ce4d77fa5d88c940e1347f0755856f", "stockMedian": 1.922425, "nativeMedian": 1.725547, "stockTrials": [ 1.922425103, 1.881036488, 1.926494663, 1.914394953, 1.924500717 ], "nativeTrials": [ 1.739682314, 1.736155321, 1.705994667, 1.725547084, 1.714202768 ] }, "host_observations": [ { "time": 1792682324.603799, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 9148720, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682325.6066985, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 8966932, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682326.6079261, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 8743788, 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"SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682344.6326659, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7249016, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682345.6338773, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7252756, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682346.6351898, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7168476, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682347.6364698, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7172808, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682348.6377778, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7105308, "SwapFree": 2669572 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682349.6392305, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7108112, "SwapFree": 2669600 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682350.6404314, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7039448, "SwapFree": 2669600 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682351.6415884, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 7047396, "SwapFree": 2669600 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682352.643012, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6976828, "SwapFree": 2669600 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682353.6442938, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6981404, "SwapFree": 2669600 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682354.64542, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6912324, "SwapFree": 2669608 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682355.646711, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6913180, "SwapFree": 2669608 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682356.6478736, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6860292, "SwapFree": 2669664 }, "ioFullAvg10": 0.0, "reasons": [] }, { "time": 1792682357.6491804, "cpuCores": 0.0, "processes": [], "jobs": [], "memoryKiB": { "MemAvailable": 6862072, "SwapFree": 2669664 }, "ioFullAvg10": 0.0, "reasons": [] } ] }, { "cohort": "previous", "case": "typeof", "expression": "TYPEOF(idx)", "map_source": false, "type": "BIGINT", "width": 8, "stock_trials": [ 0.412502586, 0.534410481, 0.467647328, 0.396338608, 0.398425543 ], "native_trials": [ 0.391067058, 0.400328737, 0.363812587, 0.373562815, 0.361295691 ], "route_evidence": [ "[collection-engine] [NativeCalc functions: native=[TYPEOF], jvm=[]]", "[collection-route] [{jobId=aad4d71fe0f57a82366f3aed3886e6cb, attempt=0, subtask=0, 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"[collection-route] [{jobId=b2660cdde1c6e46de80730026bd4feff, attempt=0, subtask=0, recordsOut=2000000, operator=NativeCalc(select=[TYPEOF(idx) AS v, true AS anchor], nativeFunctions=[TYPEOF], , recordsIn=2000000}]", "[collection-route] [{jobId=2c621fcf812344a15a505d278d686501, attempt=0, subtask=0, recordsOut=2000000, operator=NativeCalc(select=[TYPEOF(idx) AS v, true AS anchor], nativeFunctions=[TYPEOF], , recordsIn=2000000}]" ], "all_trials": [ "[collection-trial] engine=flink trial=0 warmup=true rows=2000000 seconds=0.975079226", "[collection-trial] engine=native trial=0 warmup=true rows=2000000 seconds=0.730374595", "[collection-trial] engine=native trial=1 warmup=true rows=2000000 seconds=0.442940514", "[collection-trial] engine=flink trial=1 warmup=true rows=2000000 seconds=0.385958454", "[collection-trial] engine=flink trial=2 warmup=false rows=2000000 seconds=0.412502586", "[collection-trial] engine=native trial=2 warmup=false rows=2000000 seconds=0.391067058", "[collection-trial] engine=native trial=3 warmup=false rows=2000000 seconds=0.400328737", "[collection-trial] engine=flink trial=3 warmup=false rows=2000000 seconds=0.534410481", "[collection-trial] engine=flink trial=4 warmup=false rows=2000000 seconds=0.467647328", "[collection-trial] engine=native trial=4 warmup=false rows=2000000 seconds=0.363812587", "[collection-trial] engine=native trial=5 warmup=false rows=2000000 seconds=0.373562815", "[collection-trial] engine=flink trial=5 warmup=false rows=2000000 seconds=0.396338608", "[collection-trial] engine=flink trial=6 warmup=false rows=2000000 seconds=0.398425543", "[collection-trial] engine=native trial=6 warmup=false rows=2000000 seconds=0.361295691" ], "validation": { "cohort": "baseline", "case": "typeof", "expression": "TYPEOF(idx)", "rows": 2000000, "width": 8, "type": "BIGINT", "map": false, "warmup": 2, "runs": 5, "command": [ "mvn", "-o", "-q", "-Pbench,flink-1.18", "-pl", "streamfusion-runtime", 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[], "memoryKiB": { "MemAvailable": 7622560, "SwapFree": 2669672 }, "ioFullAvg10": 0.0, "reasons": [] } ] }, { "cohort": "candidate", "case": "join", "expression": "ARRAY_JOIN(arr,'|','?')", "map_source": false, "type": "STRING", "width": 8, "stock_trials": [ 1.95542711, 2.012248843, 2.044383778, 1.930679126, 1.999290531 ], "native_trials": [ 1.71324482, 1.692031989, 1.684142275, 1.695208243, 1.692226503 ], "route_evidence": [ "[collection-engine] [NativeCalc functions: native=[ARRAY_JOIN], jvm=[]]", "[collection-route] [{recordsIn=2000000, jobId=0c65e017b43a0ce74b8dc5ecd5bb7a80, attempt=0, subtask=0, recordsOut=2000000, operator=NativeCalc(select=[ARRAY_JOIN(arr, '|', '?') 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