{ "date": "2026-10-16", "issue": 364, "base_commit": "8e522206f686a01107f0eac44871fc0d4d4defb6", "fixture_sha256": "019c141a32f860e2714df3784794fa649707ee8145564e27e6b29fc47aa32e93", "native_library_sha256": "24cef157092f0564f6f6c70a1d0f3d92169dd4a4c6b6fffede564cc566e96e0c", "configuration": { "flink": "2.2.1", "jdk": "17", "build": "release Rust with mimalloc", "rows": 2000000, "precision": 9, "timezone": "UTC", "parallelism": 1, "heap": "2 GiB", "batch_rows": 1024, "local_exchange": "production IPC", "warmups": 2, "measured_pairs": 5, "ordering": "alternating engine order each trial", "metrics_cluster": "fresh per job, closed before the next job", "measurement": "executeSql(insert).await(), preserving row source, row sink, both transposes and conversions; cluster construction and plan checks outside clock", "experimental_options": [ "directTemporalCalc", "temporalAliases" ], "competing_java_rust_compilers": "none observed by 500 ms /proc activity sampling" }, "limitations": [ "Flink 1.18 and previous fallback not repeated with this corrected fixture", "No claim that retained cluster history caused previous regressions", "Profiled timings excluded; all results here are unprofiled", "Text wins do not establish admission for the complete temporal scope; identity and epoch regress; keep draft and default off" ], "runs": [ { "case": "identity", "cardinality": 8, "stock_trials_s": [ 0.601866527, 0.627787238, 0.617188426, 0.619878152, 0.615224224 ], "native_trials_s": [ 0.67785983, 0.67070548, 0.648688177, 0.659136913, 0.657189133 ], "stock_median_s": 0.617188426, "native_median_s": 0.659136913, "native_elapsed_change_pct": 6.796706683543663, "raw_trials": [ "[temporal-udf-trial] case=identity engine=Flink trial=0 warmup=true rows=2000000 precision=9 start_ms=1792126348372 seconds=1.145330", "[temporal-udf-trial] case=identity engine=StreamFusion trial=0 warmup=true rows=2000000 precision=9 start_ms=1792126349910 seconds=1.032025", "[temporal-udf-trial] case=identity 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"Whole-process profiles include both engines, all warmup jobs, JIT and cluster setup. Whole-process allocation totals are not a native-versus-stock attribution. Inclusive method counts overlap.", "Direct temporal cases run generated Java on Arrow columns; zero Rust expression samples are expected. The perimeter control supplies Rust projection samples.", "Perimeter control overlapped external Java work and is diagnostic only. All profile timings excluded.", "Identity and epoch sampled TimestampData reconstruction at Arrow reads; identity also reconstructs at RowDataSerializer.copyRowData and generated UDF output conversions. These are targets for investigation, not a demonstrated optimization." ] }