[Rich-T-kid]

Adds benchmarks for #11901.

They convert rotating 8,192-key ranges from unique string dictionaries with 1M and 4M values, reusing a prepared RowConverter and timing only convert_columns. This exposes the current behavior where each small conversion re-encodes the full values array.

[Rich-T-kid]

@alamb could you stamp 🙇

[Rich-T-kid]

run benchmark row_format
env:
BENCH_FILTER: "convert_columns_prepared 8192 string_dictionary"

[adriangbot]

🤖 Benchmark starting (GKE) | trigger

Target: row_format

Sharding factor: 1 (1 workers).

Comparing bench-row-dictionary-slices-11901 (6a8c160) to b231cf1 (merge-base) diff

Run configuration

run benchmark row_format
env:
  BENCH_FILTER: convert_columns_prepared 8192 string_dictionary
shards: 1

Results will be posted when all workers finish.

---

File an issue against this benchmark runner

[adriangbot]

🤖 Benchmark completed (GKE) | trigger

Target: row_format

Comparing bench-row-dictionary-slices-11901 (6a8c160) to b231cf1 (merge-base) diff

Run configuration

run benchmark row_format
env:
  BENCH_FILTER: convert_columns_prepared 8192 string_dictionary
shards: 1

Details

group                                                              changed
-----                                                              -------
convert_columns_prepared 8192 string_dictionary(1000000 values)    1.00      6.7±0.03ms        ? ?/sec
convert_columns_prepared 8192 string_dictionary(4000000 values)    1.00     67.2±0.43ms        ? ?/sec

Per-runner information

row_format — shard 1/1

Node: gk3-benchmark-cluster-nap-o8oe52el-122737a1-l6bj

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

uname:

Linux bench-c6595253362-4298-m2lps 6.12.105+ #1 SMP Sat Sep 19 07:55:25 UTC 2026 aarch64 GNU/Linux

BENCH_COMMAND:

cargo bench --features=arrow,async,test_common,experimental,object_store --bench row_format

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

Resource Usage

base (merge-base)

Metric	Value
Wall time	5.0s
Peak memory	5.8 MiB
Avg memory	984.0 KiB
CPU user	0.0s
CPU sys	0.0s
Peak spill	0 B

branch

Metric	Value
Wall time	25.0s
Peak memory	221.7 MiB
Avg memory	78.6 MiB
CPU user	13.0s
CPU sys	6.0s
Peak spill	0 B

---

File an issue against this benchmark runner

[Rich-T-kid]

Superseded by #12054, which combines this with the related benchmark coverage.