Compare length + prefix together in ArrowBytesViewMap find

[Dandandan]

Which issue does this PR close?

N/A - performance optimization

Rationale for this change

When probing ArrowBytesViewMap for strings > 12 bytes, the existing code only compared the 4-byte prefix before falling through to a full byte comparison. It did not compare the string length first, so two strings with different lengths but the same hash and prefix would unnecessarily perform a full memcmp.

What changes are included in this PR?

Compare the first 8 bytes of the StringView (length + 4-byte prefix) as a single u64 instead of extracting and comparing only the 4-byte prefix. This:

• Rejects length mismatches earlier (before the full byte comparison)
• Is simpler (one u64 comparison vs one u32 extraction + comparison)
• Is no slower (one 8-byte cmp vs one 4-byte cmp on modern CPUs)

Are these changes tested?

Existing tests cover this code path.

Are there any user-facing changes?

No, this is a performance optimization only.

🤖 Generated with Claude Code

[Dandandan]

run benchmarks

[adriangbot]

🤖 Benchmark running (GKE) | trigger
Instance: c4a-highmem-16 (12 vCPU / 65 GiB) | Linux bench-c4183643650-745-h2cm4 6.12.55+ #1 SMP Sun Feb 1 08:59:41 UTC 2026 aarch64 GNU/Linux

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Comparing bytes-view-map-length-prefix-compare (7522675) to 1e93a67 (merge-base) diff using: clickbench_partitioned
Results will be posted here when complete

---

File an issue against this benchmark runner

[adriangbot]

🤖 Benchmark running (GKE) | trigger
Instance: c4a-highmem-16 (12 vCPU / 65 GiB) | Linux bench-c4183643650-746-rtxl7 6.12.55+ #1 SMP Sun Feb 1 08:59:41 UTC 2026 aarch64 GNU/Linux

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Comparing bytes-view-map-length-prefix-compare (7522675) to 1e93a67 (merge-base) diff using: tpcds
Results will be posted here when complete

---

File an issue against this benchmark runner

[adriangbot]

🤖 Benchmark running (GKE) | trigger
Instance: c4a-highmem-16 (12 vCPU / 65 GiB) | Linux bench-c4183643650-747-jw55h 6.12.55+ #1 SMP Sun Feb 1 08:59:41 UTC 2026 aarch64 GNU/Linux

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Comparing bytes-view-map-length-prefix-compare (7522675) to 1e93a67 (merge-base) diff using: tpch
Results will be posted here when complete

---

File an issue against this benchmark runner

[adriangbot]

🤖 Benchmark completed (GKE) | trigger

Instance: c4a-highmem-16 (12 vCPU / 65 GiB)

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Details

Comparing HEAD and bytes-view-map-length-prefix-compare
--------------------
Benchmark tpch_sf1.json
--------------------
┏━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query     ┃                           HEAD ┃ bytes-view-map-length-prefix-compare ┃        Change ┃
┡━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 1  │ 45.20 / 45.78 ±0.61 / 46.91 ms │       45.13 / 46.49 ±1.02 / 47.96 ms │     no change │
│ QQuery 2  │ 20.96 / 21.16 ±0.12 / 21.30 ms │       21.17 / 21.34 ±0.17 / 21.65 ms │     no change │
│ QQuery 3  │ 31.35 / 31.70 ±0.24 / 31.98 ms │       31.54 / 31.64 ±0.09 / 31.79 ms │     no change │
│ QQuery 4  │ 20.58 / 21.16 ±0.49 / 21.76 ms │       20.36 / 21.44 ±0.76 / 22.43 ms │     no change │
│ QQuery 5  │ 48.49 / 49.00 ±0.51 / 49.90 ms │       48.02 / 49.34 ±1.47 / 51.80 ms │     no change │
│ QQuery 6  │ 16.83 / 17.03 ±0.13 / 17.23 ms │       16.90 / 17.55 ±0.71 / 18.45 ms │     no change │
│ QQuery 7  │ 54.30 / 55.86 ±1.00 / 57.19 ms │       54.66 / 55.48 ±0.88 / 56.93 ms │     no change │
│ QQuery 8  │ 48.17 / 48.55 ±0.27 / 48.91 ms │       47.42 / 47.89 ±0.46 / 48.76 ms │     no change │
│ QQuery 9  │ 53.50 / 54.47 ±0.64 / 55.44 ms │       53.20 / 54.60 ±1.12 / 56.55 ms │     no change │
│ QQuery 10 │ 71.19 / 73.14 ±1.35 / 75.22 ms │       70.78 / 71.84 ±1.22 / 74.08 ms │     no change │
│ QQuery 11 │ 14.06 / 14.36 ±0.24 / 14.77 ms │       14.07 / 14.29 ±0.21 / 14.67 ms │     no change │
│ QQuery 12 │ 27.16 / 27.78 ±0.32 / 28.08 ms │       27.70 / 28.22 ±0.53 / 29.10 ms │     no change │
│ QQuery 13 │ 38.49 / 39.49 ±0.97 / 41.21 ms │       38.81 / 39.56 ±0.41 / 40.00 ms │     no change │
│ QQuery 14 │ 28.25 / 28.62 ±0.39 / 29.33 ms │       28.46 / 28.71 ±0.18 / 28.99 ms │     no change │
│ QQuery 15 │ 32.80 / 33.83 ±1.42 / 36.50 ms │       33.50 / 34.42 ±0.82 / 35.90 ms │     no change │
│ QQuery 16 │ 15.90 / 16.35 ±0.53 / 17.35 ms │       15.95 / 16.23 ±0.24 / 16.54 ms │     no change │
│ QQuery 17 │ 73.22 / 74.45 ±1.09 / 76.29 ms │       73.41 / 74.22 ±0.57 / 74.83 ms │     no change │
│ QQuery 18 │ 77.87 / 79.06 ±0.97 / 80.27 ms │       77.50 / 78.04 ±0.61 / 79.18 ms │     no change │
│ QQuery 19 │ 37.51 / 39.64 ±1.67 / 42.60 ms │       36.83 / 37.63 ±0.73 / 38.99 ms │ +1.05x faster │
│ QQuery 20 │ 39.59 / 41.12 ±1.12 / 42.87 ms │       40.11 / 41.75 ±1.34 / 44.04 ms │     no change │
│ QQuery 21 │ 63.89 / 65.72 ±1.37 / 67.06 ms │       63.40 / 65.14 ±2.22 / 69.37 ms │     no change │
│ QQuery 22 │ 17.90 / 18.24 ±0.27 / 18.69 ms │       17.89 / 18.53 ±0.68 / 19.63 ms │     no change │
└───────────┴────────────────────────────────┴──────────────────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━┓
┃ Benchmark Summary                                   ┃          ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━┩
│ Total Time (HEAD)                                   │ 896.49ms │
│ Total Time (bytes-view-map-length-prefix-compare)   │ 894.37ms │
│ Average Time (HEAD)                                 │  40.75ms │
│ Average Time (bytes-view-map-length-prefix-compare) │  40.65ms │
│ Queries Faster                                      │        1 │
│ Queries Slower                                      │        0 │
│ Queries with No Change                              │       21 │
│ Queries with Failure                                │        0 │
└─────────────────────────────────────────────────────┴──────────┘

Resource Usage

tpch — base (merge-base)

Metric	Value
Wall time	4.8s
Peak memory	4.0 GiB
Avg memory	3.6 GiB
CPU user	33.6s
CPU sys	2.4s
Disk read	0 B
Disk write	136.0 KiB

tpch — branch

Metric	Value
Wall time	4.7s
Peak memory	4.0 GiB
Avg memory	3.6 GiB
CPU user	33.6s
CPU sys	2.4s
Disk read	0 B
Disk write	72.0 KiB

---

File an issue against this benchmark runner

[adriangbot]

🤖 Benchmark completed (GKE) | trigger

Instance: c4a-highmem-16 (12 vCPU / 65 GiB)

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Details

Comparing HEAD and bytes-view-map-length-prefix-compare
--------------------
Benchmark tpcds_sf1.json
--------------------
┏━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query     ┃                                     HEAD ┃     bytes-view-map-length-prefix-compare ┃        Change ┃
┡━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 1  │           42.95 / 43.77 ±0.75 / 44.97 ms │           43.15 / 43.70 ±0.58 / 44.72 ms │     no change │
│ QQuery 2  │        147.52 / 148.28 ±0.66 / 149.41 ms │        145.97 / 146.50 ±0.67 / 147.72 ms │     no change │
│ QQuery 3  │        114.33 / 114.98 ±0.70 / 116.25 ms │        113.25 / 113.62 ±0.29 / 114.05 ms │     no change │
│ QQuery 4  │    1328.58 / 1364.28 ±30.48 / 1418.48 ms │    1314.32 / 1336.07 ±14.60 / 1351.48 ms │     no change │
│ QQuery 5  │        173.26 / 175.57 ±1.49 / 177.72 ms │        172.11 / 173.33 ±1.06 / 175.13 ms │     no change │
│ QQuery 6  │    1021.20 / 1044.90 ±13.40 / 1056.35 ms │      996.57 / 1006.84 ±9.08 / 1022.83 ms │     no change │
│ QQuery 7  │        349.54 / 352.56 ±2.82 / 357.15 ms │        351.84 / 355.17 ±4.59 / 364.21 ms │     no change │
│ QQuery 8  │        116.21 / 116.41 ±0.21 / 116.81 ms │        116.17 / 116.81 ±0.37 / 117.24 ms │     no change │
│ QQuery 9  │        101.01 / 103.46 ±2.27 / 106.50 ms │        100.03 / 106.37 ±6.46 / 118.39 ms │     no change │
│ QQuery 10 │        106.04 / 106.40 ±0.41 / 107.21 ms │        105.33 / 107.06 ±1.15 / 108.70 ms │     no change │
│ QQuery 11 │       908.38 / 924.98 ±13.78 / 942.77 ms │        938.17 / 940.83 ±2.62 / 945.09 ms │     no change │
│ QQuery 12 │           45.17 / 46.50 ±0.86 / 47.87 ms │           44.04 / 46.65 ±1.38 / 48.02 ms │     no change │
│ QQuery 13 │        398.51 / 400.39 ±2.04 / 403.09 ms │        392.79 / 399.46 ±3.58 / 402.82 ms │     no change │
│ QQuery 14 │     1017.84 / 1025.14 ±4.53 / 1029.59 ms │    1013.15 / 1029.16 ±20.61 / 1068.60 ms │     no change │
│ QQuery 15 │           15.76 / 16.33 ±0.49 / 17.20 ms │           15.51 / 16.14 ±0.59 / 17.17 ms │     no change │
│ QQuery 16 │           39.41 / 40.42 ±0.79 / 41.72 ms │           40.14 / 41.57 ±1.09 / 43.02 ms │     no change │
│ QQuery 17 │        239.97 / 241.33 ±0.77 / 242.33 ms │        235.96 / 237.54 ±1.65 / 240.47 ms │     no change │
│ QQuery 18 │        128.82 / 129.92 ±0.93 / 131.45 ms │        127.52 / 128.85 ±1.04 / 130.41 ms │     no change │
│ QQuery 19 │        154.76 / 156.50 ±1.59 / 159.47 ms │        153.25 / 155.48 ±1.31 / 156.97 ms │     no change │
│ QQuery 20 │           14.06 / 15.08 ±0.56 / 15.58 ms │           13.69 / 14.26 ±0.52 / 14.89 ms │ +1.06x faster │
│ QQuery 21 │           18.86 / 19.65 ±0.60 / 20.46 ms │           19.38 / 19.68 ±0.34 / 20.33 ms │     no change │
│ QQuery 22 │        489.97 / 495.57 ±3.97 / 500.26 ms │        485.29 / 487.63 ±2.07 / 490.74 ms │     no change │
│ QQuery 23 │        894.17 / 903.72 ±7.39 / 913.02 ms │       882.95 / 895.95 ±10.92 / 908.84 ms │     no change │
│ QQuery 24 │        412.50 / 416.13 ±2.90 / 421.18 ms │        413.44 / 414.54 ±0.96 / 415.96 ms │     no change │
│ QQuery 25 │        353.10 / 354.97 ±1.78 / 357.55 ms │        349.27 / 354.83 ±4.32 / 361.38 ms │     no change │
│ QQuery 26 │           79.90 / 82.20 ±1.32 / 83.97 ms │           80.92 / 82.23 ±0.87 / 83.45 ms │     no change │
│ QQuery 27 │        348.42 / 349.73 ±1.61 / 352.80 ms │        348.11 / 350.23 ±1.79 / 353.15 ms │     no change │
│ QQuery 28 │        147.78 / 148.62 ±0.66 / 149.64 ms │        147.78 / 149.58 ±1.91 / 153.10 ms │     no change │
│ QQuery 29 │        294.58 / 296.38 ±1.59 / 299.37 ms │        298.77 / 300.77 ±1.88 / 303.17 ms │     no change │
│ QQuery 30 │           43.55 / 45.33 ±1.83 / 48.54 ms │           43.26 / 45.15 ±1.55 / 47.75 ms │     no change │
│ QQuery 31 │        169.05 / 173.46 ±3.70 / 180.20 ms │        169.67 / 171.65 ±1.33 / 173.82 ms │     no change │
│ QQuery 32 │           56.83 / 57.48 ±0.37 / 57.94 ms │           57.72 / 58.07 ±0.33 / 58.61 ms │     no change │
│ QQuery 33 │        139.26 / 139.98 ±0.36 / 140.23 ms │        139.80 / 141.97 ±1.31 / 143.36 ms │     no change │
│ QQuery 34 │        105.64 / 107.17 ±1.09 / 108.91 ms │        106.25 / 107.19 ±1.01 / 109.07 ms │     no change │
│ QQuery 35 │        105.61 / 108.29 ±1.74 / 110.36 ms │        108.11 / 108.90 ±0.83 / 110.10 ms │     no change │
│ QQuery 36 │        212.91 / 218.47 ±3.54 / 222.80 ms │        214.86 / 220.38 ±3.80 / 226.22 ms │     no change │
│ QQuery 37 │        174.94 / 176.84 ±1.63 / 179.65 ms │        174.37 / 177.88 ±2.25 / 179.96 ms │     no change │
│ QQuery 38 │           85.37 / 89.07 ±2.25 / 91.96 ms │           84.74 / 88.99 ±3.90 / 94.55 ms │     no change │
│ QQuery 39 │        126.22 / 128.38 ±1.59 / 130.61 ms │        125.08 / 126.91 ±1.69 / 129.96 ms │     no change │
│ QQuery 40 │        111.68 / 116.18 ±5.15 / 126.09 ms │        109.62 / 116.08 ±5.92 / 126.41 ms │     no change │
│ QQuery 41 │           14.10 / 14.93 ±0.60 / 15.69 ms │           14.07 / 14.71 ±0.56 / 15.45 ms │     no change │
│ QQuery 42 │        106.56 / 109.60 ±1.69 / 111.62 ms │        106.74 / 109.16 ±2.02 / 111.93 ms │     no change │
│ QQuery 43 │           82.70 / 83.90 ±0.86 / 85.39 ms │           83.20 / 84.36 ±1.17 / 86.52 ms │     no change │
│ QQuery 44 │           11.03 / 11.54 ±0.40 / 12.02 ms │           11.36 / 11.94 ±0.30 / 12.24 ms │     no change │
│ QQuery 45 │           51.68 / 53.23 ±1.03 / 54.55 ms │           52.07 / 53.57 ±1.24 / 55.12 ms │     no change │
│ QQuery 46 │        232.55 / 236.26 ±1.99 / 238.09 ms │        232.56 / 236.22 ±3.11 / 240.43 ms │     no change │
│ QQuery 47 │        704.02 / 712.93 ±5.02 / 718.99 ms │       708.15 / 726.63 ±11.57 / 742.36 ms │     no change │
│ QQuery 48 │        283.81 / 288.63 ±3.80 / 294.83 ms │        286.55 / 294.11 ±9.17 / 312.17 ms │     no change │
│ QQuery 49 │        252.91 / 255.17 ±1.58 / 257.33 ms │        252.85 / 255.00 ±1.55 / 257.10 ms │     no change │
│ QQuery 50 │        231.82 / 235.95 ±2.74 / 239.01 ms │        228.19 / 232.96 ±3.23 / 236.55 ms │     no change │
│ QQuery 51 │        181.13 / 183.28 ±2.01 / 186.83 ms │        179.25 / 182.93 ±2.15 / 185.79 ms │     no change │
│ QQuery 52 │        107.77 / 109.88 ±2.43 / 114.41 ms │        106.68 / 107.70 ±0.97 / 109.51 ms │     no change │
│ QQuery 53 │        101.65 / 102.91 ±1.12 / 104.86 ms │        101.97 / 102.89 ±0.86 / 104.01 ms │     no change │
│ QQuery 54 │        146.00 / 149.50 ±2.61 / 153.79 ms │        146.94 / 148.83 ±1.04 / 150.14 ms │     no change │
│ QQuery 55 │        107.01 / 107.49 ±0.27 / 107.78 ms │        107.05 / 108.84 ±1.55 / 111.13 ms │     no change │
│ QQuery 56 │        139.93 / 140.98 ±0.80 / 142.42 ms │        139.59 / 140.51 ±1.04 / 142.44 ms │     no change │
│ QQuery 57 │        172.75 / 175.68 ±1.90 / 178.09 ms │        169.90 / 175.13 ±3.00 / 178.04 ms │     no change │
│ QQuery 58 │        294.91 / 299.27 ±3.62 / 303.94 ms │        297.00 / 302.36 ±2.92 / 304.69 ms │     no change │
│ QQuery 59 │        199.04 / 201.67 ±1.72 / 203.55 ms │        198.53 / 199.39 ±0.82 / 200.42 ms │     no change │
│ QQuery 60 │        142.99 / 145.12 ±1.33 / 146.56 ms │        142.48 / 143.94 ±1.19 / 145.15 ms │     no change │
│ QQuery 61 │        171.41 / 172.48 ±1.03 / 174.36 ms │        171.01 / 172.52 ±1.43 / 175.07 ms │     no change │
│ QQuery 62 │       874.72 / 917.63 ±24.06 / 947.57 ms │        893.18 / 904.26 ±8.35 / 913.68 ms │     no change │
│ QQuery 63 │        103.07 / 105.36 ±1.58 / 107.12 ms │        104.04 / 105.36 ±1.17 / 107.45 ms │     no change │
│ QQuery 64 │        694.40 / 700.39 ±5.77 / 709.81 ms │        701.03 / 705.78 ±3.58 / 710.77 ms │     no change │
│ QQuery 65 │        248.65 / 252.42 ±3.24 / 257.62 ms │        253.99 / 257.83 ±2.17 / 259.81 ms │     no change │
│ QQuery 66 │        234.28 / 249.68 ±9.47 / 261.27 ms │        241.58 / 250.13 ±6.96 / 261.05 ms │     no change │
│ QQuery 67 │        310.13 / 318.67 ±6.40 / 329.39 ms │        312.05 / 316.05 ±3.41 / 321.90 ms │     no change │
│ QQuery 68 │        283.35 / 287.22 ±3.71 / 293.63 ms │        273.78 / 279.25 ±3.61 / 283.20 ms │     no change │
│ QQuery 69 │        101.84 / 102.79 ±0.95 / 104.43 ms │        100.99 / 103.10 ±1.84 / 106.09 ms │     no change │
│ QQuery 70 │       326.02 / 340.81 ±10.20 / 357.17 ms │        336.09 / 342.96 ±5.56 / 353.14 ms │     no change │
│ QQuery 71 │        133.99 / 135.89 ±1.01 / 136.81 ms │        134.94 / 135.21 ±0.36 / 135.88 ms │     no change │
│ QQuery 72 │       719.91 / 731.94 ±10.73 / 748.31 ms │       707.04 / 720.57 ±10.84 / 739.68 ms │     no change │
│ QQuery 73 │        103.32 / 104.86 ±1.19 / 106.84 ms │        102.08 / 104.40 ±2.02 / 107.90 ms │     no change │
│ QQuery 74 │        588.40 / 594.99 ±4.76 / 601.61 ms │        575.82 / 585.79 ±6.13 / 595.06 ms │     no change │
│ QQuery 75 │        276.02 / 277.18 ±1.21 / 278.88 ms │        274.57 / 278.51 ±2.66 / 282.78 ms │     no change │
│ QQuery 76 │        131.07 / 134.37 ±2.59 / 138.85 ms │        131.29 / 132.44 ±1.19 / 134.66 ms │     no change │
│ QQuery 77 │        188.46 / 189.94 ±1.00 / 191.02 ms │        189.03 / 190.34 ±1.24 / 192.15 ms │     no change │
│ QQuery 78 │        348.57 / 352.78 ±4.39 / 358.48 ms │        351.83 / 356.52 ±3.95 / 361.95 ms │     no change │
│ QQuery 79 │        230.14 / 235.68 ±3.59 / 241.37 ms │        231.67 / 235.01 ±2.43 / 237.77 ms │     no change │
│ QQuery 80 │        327.81 / 330.01 ±2.34 / 334.49 ms │        327.58 / 330.08 ±2.05 / 333.25 ms │     no change │
│ QQuery 81 │           26.41 / 28.10 ±1.63 / 30.89 ms │           26.71 / 28.24 ±1.50 / 30.81 ms │     no change │
│ QQuery 82 │        198.28 / 201.51 ±2.32 / 205.45 ms │        199.55 / 201.20 ±1.36 / 203.11 ms │     no change │
│ QQuery 83 │           39.10 / 40.33 ±0.70 / 41.16 ms │           40.03 / 40.92 ±0.77 / 41.86 ms │     no change │
│ QQuery 84 │           47.52 / 49.53 ±1.69 / 51.70 ms │           47.71 / 48.80 ±0.66 / 49.64 ms │     no change │
│ QQuery 85 │        147.10 / 149.27 ±1.53 / 151.55 ms │        149.52 / 150.87 ±0.99 / 152.38 ms │     no change │
│ QQuery 86 │           38.45 / 40.18 ±1.61 / 43.25 ms │           39.07 / 40.66 ±1.37 / 42.79 ms │     no change │
│ QQuery 87 │           89.88 / 91.83 ±1.62 / 93.90 ms │           85.00 / 90.77 ±3.97 / 97.39 ms │     no change │
│ QQuery 88 │         99.29 / 100.65 ±1.27 / 102.75 ms │         99.74 / 100.74 ±0.93 / 102.37 ms │     no change │
│ QQuery 89 │        117.87 / 118.89 ±1.05 / 120.46 ms │        119.42 / 120.57 ±0.94 / 122.20 ms │     no change │
│ QQuery 90 │           23.28 / 23.71 ±0.39 / 24.31 ms │           24.07 / 24.54 ±0.45 / 25.38 ms │     no change │
│ QQuery 91 │           62.15 / 63.50 ±0.93 / 64.59 ms │           62.56 / 64.35 ±1.45 / 67.00 ms │     no change │
│ QQuery 92 │           56.56 / 57.86 ±0.71 / 58.72 ms │           58.84 / 59.45 ±0.46 / 60.15 ms │     no change │
│ QQuery 93 │        191.49 / 193.75 ±1.33 / 195.60 ms │        198.44 / 199.65 ±1.50 / 202.38 ms │     no change │
│ QQuery 94 │           61.21 / 61.71 ±0.33 / 62.21 ms │           61.63 / 62.50 ±0.72 / 63.74 ms │     no change │
│ QQuery 95 │        133.92 / 137.07 ±2.24 / 139.82 ms │        136.53 / 138.08 ±1.39 / 140.18 ms │     no change │
│ QQuery 96 │           72.68 / 74.05 ±0.94 / 75.48 ms │           70.53 / 74.47 ±2.04 / 76.41 ms │     no change │
│ QQuery 97 │        131.21 / 131.99 ±0.66 / 132.90 ms │        126.85 / 131.32 ±2.27 / 133.21 ms │     no change │
│ QQuery 98 │        154.58 / 155.70 ±1.19 / 157.24 ms │        154.25 / 156.72 ±1.40 / 158.53 ms │     no change │
│ QQuery 99 │ 10764.81 / 10803.97 ±30.23 / 10856.38 ms │ 10793.57 / 10849.81 ±40.20 / 10896.38 ms │     no change │
└───────────┴──────────────────────────────────────────┴──────────────────────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Benchmark Summary                                   ┃            ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ Total Time (HEAD)                                   │ 33671.43ms │
│ Total Time (bytes-view-map-length-prefix-compare)   │ 33655.01ms │
│ Average Time (HEAD)                                 │   340.12ms │
│ Average Time (bytes-view-map-length-prefix-compare) │   339.95ms │
│ Queries Faster                                      │          1 │
│ Queries Slower                                      │          0 │
│ Queries with No Change                              │         98 │
│ Queries with Failure                                │          0 │
└─────────────────────────────────────────────────────┴────────────┘

Resource Usage

tpcds — base (merge-base)

Metric	Value
Wall time	168.7s
Peak memory	5.3 GiB
Avg memory	4.4 GiB
CPU user	271.4s
CPU sys	17.4s
Disk read	0 B
Disk write	638.1 MiB

tpcds — branch

Metric	Value
Wall time	168.6s
Peak memory	5.8 GiB
Avg memory	4.7 GiB
CPU user	270.4s
CPU sys	17.6s
Disk read	0 B
Disk write	784.0 KiB

---

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🤖 Benchmark completed (GKE) | trigger

Instance: c4a-highmem-16 (12 vCPU / 65 GiB)

CPU Details (lscpu)

Architecture:                            aarch64
CPU op-mode(s):                          64-bit
Byte Order:                              Little Endian
CPU(s):                                  16
On-line CPU(s) list:                     0-15
Vendor ID:                               ARM
Model name:                              Neoverse-V2
Model:                                   1
Thread(s) per core:                      1
Core(s) per cluster:                     16
Socket(s):                               -
Cluster(s):                              1
Stepping:                                r0p1
BogoMIPS:                                2000.00
Flags:                                   fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16 dgh rng bti
L1d cache:                               1 MiB (16 instances)
L1i cache:                               1 MiB (16 instances)
L2 cache:                                32 MiB (16 instances)
L3 cache:                                80 MiB (1 instance)
NUMA node(s):                            1
NUMA node0 CPU(s):                       0-15
Vulnerability Gather data sampling:      Not affected
Vulnerability Indirect target selection: Not affected
Vulnerability Itlb multihit:             Not affected
Vulnerability L1tf:                      Not affected
Vulnerability Mds:                       Not affected
Vulnerability Meltdown:                  Not affected
Vulnerability Mmio stale data:           Not affected
Vulnerability Reg file data sampling:    Not affected
Vulnerability Retbleed:                  Not affected
Vulnerability Spec rstack overflow:      Not affected
Vulnerability Spec store bypass:         Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:                Mitigation; __user pointer sanitization
Vulnerability Spectre v2:                Mitigation; CSV2, BHB
Vulnerability Srbds:                     Not affected
Vulnerability Tsa:                       Not affected
Vulnerability Tsx async abort:           Not affected
Vulnerability Vmscape:                   Not affected

Details

Comparing HEAD and bytes-view-map-length-prefix-compare
--------------------
Benchmark clickbench_partitioned.json
--------------------
┏━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query     ┃                                  HEAD ┃  bytes-view-map-length-prefix-compare ┃        Change ┃
┡━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 0  │          1.28 / 4.58 ±6.41 / 17.40 ms │          1.29 / 4.57 ±6.42 / 17.40 ms │     no change │
│ QQuery 1  │        14.20 / 14.51 ±0.21 / 14.73 ms │        14.16 / 14.81 ±0.34 / 15.09 ms │     no change │
│ QQuery 2  │        43.35 / 43.64 ±0.19 / 43.87 ms │        44.69 / 44.96 ±0.17 / 45.20 ms │     no change │
│ QQuery 3  │        40.06 / 44.61 ±2.64 / 47.38 ms │        42.47 / 44.74 ±1.56 / 47.23 ms │     no change │
│ QQuery 4  │    291.96 / 306.48 ±15.47 / 336.34 ms │    294.99 / 303.13 ±10.77 / 324.09 ms │     no change │
│ QQuery 5  │     353.91 / 356.97 ±3.28 / 361.82 ms │     341.19 / 347.85 ±5.24 / 356.11 ms │     no change │
│ QQuery 6  │           5.98 / 6.69 ±0.69 / 7.68 ms │          5.64 / 8.27 ±2.37 / 12.12 ms │  1.24x slower │
│ QQuery 7  │        16.58 / 17.31 ±0.99 / 19.25 ms │        17.03 / 17.37 ±0.39 / 18.12 ms │     no change │
│ QQuery 8  │    429.70 / 443.49 ±13.76 / 469.56 ms │    437.69 / 450.28 ±11.93 / 472.70 ms │     no change │
│ QQuery 9  │     646.96 / 654.10 ±8.09 / 668.65 ms │     642.03 / 655.22 ±8.32 / 666.25 ms │     no change │
│ QQuery 10 │        90.47 / 93.76 ±3.14 / 99.19 ms │       93.78 / 96.15 ±2.70 / 101.29 ms │     no change │
│ QQuery 11 │     102.92 / 103.58 ±0.61 / 104.62 ms │     106.75 / 108.49 ±0.93 / 109.29 ms │     no change │
│ QQuery 12 │     352.71 / 360.73 ±6.86 / 370.19 ms │    345.98 / 358.53 ±14.02 / 384.75 ms │     no change │
│ QQuery 13 │     464.08 / 473.34 ±4.83 / 478.12 ms │     459.48 / 469.07 ±8.30 / 480.68 ms │     no change │
│ QQuery 14 │     349.02 / 358.82 ±5.99 / 366.37 ms │     355.73 / 360.75 ±4.82 / 368.90 ms │     no change │
│ QQuery 15 │    361.13 / 378.53 ±16.50 / 407.32 ms │    363.11 / 370.56 ±12.39 / 395.24 ms │     no change │
│ QQuery 16 │    724.35 / 755.68 ±31.99 / 813.46 ms │    724.07 / 750.50 ±34.07 / 816.33 ms │     no change │
│ QQuery 17 │     720.73 / 732.21 ±9.25 / 747.54 ms │    725.34 / 764.80 ±37.49 / 832.22 ms │     no change │
│ QQuery 18 │ 1395.76 / 1483.74 ±44.80 / 1516.26 ms │ 1410.95 / 1459.60 ±41.20 / 1521.99 ms │     no change │
│ QQuery 19 │        35.13 / 37.29 ±1.37 / 38.60 ms │        35.76 / 36.85 ±0.89 / 38.25 ms │     no change │
│ QQuery 20 │    723.21 / 738.65 ±15.73 / 761.87 ms │     707.79 / 718.07 ±9.00 / 730.00 ms │     no change │
│ QQuery 21 │     758.98 / 763.07 ±2.56 / 765.88 ms │     760.76 / 764.13 ±2.77 / 768.25 ms │     no change │
│ QQuery 22 │  1134.06 / 1139.26 ±6.85 / 1152.25 ms │  1136.86 / 1143.54 ±4.78 / 1149.30 ms │     no change │
│ QQuery 23 │ 3074.19 / 3102.26 ±19.49 / 3129.99 ms │ 3097.50 / 3125.54 ±15.95 / 3142.04 ms │     no change │
│ QQuery 24 │      99.09 / 102.48 ±2.04 / 104.75 ms │     100.59 / 104.30 ±3.01 / 108.93 ms │     no change │
│ QQuery 25 │     138.09 / 141.10 ±2.09 / 144.52 ms │     142.00 / 143.08 ±1.40 / 145.57 ms │     no change │
│ QQuery 26 │      99.11 / 103.26 ±2.39 / 106.20 ms │     105.10 / 105.81 ±0.66 / 106.86 ms │     no change │
│ QQuery 27 │     847.86 / 853.41 ±5.19 / 862.90 ms │     844.81 / 854.38 ±9.21 / 870.96 ms │     no change │
│ QQuery 28 │ 7708.45 / 7780.21 ±38.57 / 7825.00 ms │ 7760.35 / 7802.82 ±41.17 / 7874.21 ms │     no change │
│ QQuery 29 │        49.24 / 54.65 ±5.42 / 62.16 ms │        51.66 / 55.44 ±3.66 / 62.40 ms │     no change │
│ QQuery 30 │     369.69 / 374.91 ±3.42 / 379.29 ms │    357.58 / 368.32 ±10.46 / 388.19 ms │     no change │
│ QQuery 31 │    373.20 / 386.65 ±11.75 / 403.91 ms │    367.75 / 380.85 ±10.32 / 394.97 ms │     no change │
│ QQuery 32 │ 1215.61 / 1268.54 ±56.05 / 1376.88 ms │ 1027.55 / 1052.19 ±22.87 / 1093.25 ms │ +1.21x faster │
│ QQuery 33 │ 1551.24 / 1589.39 ±40.43 / 1654.78 ms │  1443.54 / 1449.52 ±3.47 / 1453.04 ms │ +1.10x faster │
│ QQuery 34 │ 1508.58 / 1553.72 ±26.64 / 1588.17 ms │ 1458.70 / 1550.63 ±62.25 / 1643.59 ms │     no change │
│ QQuery 35 │     390.52 / 396.13 ±5.38 / 405.97 ms │    399.46 / 444.68 ±33.60 / 477.11 ms │  1.12x slower │
│ QQuery 36 │     125.55 / 128.29 ±2.37 / 132.15 ms │     120.60 / 122.91 ±1.92 / 126.33 ms │     no change │
│ QQuery 37 │        48.79 / 51.36 ±1.72 / 53.88 ms │        45.67 / 48.58 ±1.63 / 50.33 ms │ +1.06x faster │
│ QQuery 38 │        76.51 / 81.29 ±3.01 / 85.42 ms │      78.40 / 93.40 ±23.56 / 140.02 ms │  1.15x slower │
│ QQuery 39 │     211.75 / 222.25 ±6.63 / 232.52 ms │    225.00 / 240.36 ±17.61 / 274.87 ms │  1.08x slower │
│ QQuery 40 │        23.12 / 27.37 ±3.34 / 31.94 ms │        24.44 / 26.90 ±1.85 / 29.85 ms │     no change │
│ QQuery 41 │        20.36 / 22.30 ±2.07 / 26.32 ms │        19.83 / 21.65 ±0.95 / 22.42 ms │     no change │
│ QQuery 42 │        19.26 / 20.27 ±0.63 / 20.95 ms │        19.67 / 20.15 ±0.38 / 20.75 ms │     no change │
└───────────┴───────────────────────────────────────┴───────────────────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Benchmark Summary                                   ┃            ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ Total Time (HEAD)                                   │ 27570.86ms │
│ Total Time (bytes-view-map-length-prefix-compare)   │ 27303.74ms │
│ Average Time (HEAD)                                 │   641.18ms │
│ Average Time (bytes-view-map-length-prefix-compare) │   634.97ms │
│ Queries Faster                                      │          3 │
│ Queries Slower                                      │          4 │
│ Queries with No Change                              │         36 │
│ Queries with Failure                                │          0 │
└─────────────────────────────────────────────────────┴────────────┘

Resource Usage

clickbench_partitioned — base (merge-base)

Metric	Value
Wall time	138.9s
Peak memory	36.1 GiB
Avg memory	27.7 GiB
CPU user	1291.9s
CPU sys	100.7s
Disk read	0 B
Disk write	4.4 GiB

clickbench_partitioned — branch

Metric	Value
Wall time	137.1s
Peak memory	40.8 GiB
Avg memory	32.8 GiB
CPU user	1291.0s
CPU sys	90.4s
Disk read	0 B
Disk write	120.0 KiB

---

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