Set batch size for selections buffer

[Dandandan]

Which issue does this PR close?

• Closes #NNN.

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[Dandandan]

run benchmark arrow_reader_clickbench

[alamb-ghbot]

🤖 ./gh_compare_arrow.sh gh_compare_arrow.sh Running
Linux aal-dev 6.14.0-1018-gcp #19~24.04.1-Ubuntu SMP Wed Sep 24 23:23:09 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Comparing selection_batch_size (68a9d13) to d6168e5 diff
BENCH_NAME=arrow_reader_clickbench
BENCH_COMMAND=cargo bench --features=arrow,async,test_common,experimental,object_store --bench arrow_reader_clickbench
BENCH_FILTER=
BENCH_BRANCH_NAME=selection_batch_size
Results will be posted here when complete

[alamb-ghbot]

🤖: Benchmark completed

Details

group                                             main                                   selection_batch_size
-----                                             ----                                   --------------------
arrow_reader_clickbench/async/Q1                  1.02      2.4±0.04ms        ? ?/sec    1.00      2.3±0.02ms        ? ?/sec
arrow_reader_clickbench/async/Q10                 1.00     11.8±0.39ms        ? ?/sec    1.00     11.8±0.28ms        ? ?/sec
arrow_reader_clickbench/async/Q11                 1.00     13.5±0.36ms        ? ?/sec    1.00     13.5±0.32ms        ? ?/sec
arrow_reader_clickbench/async/Q12                 1.00     23.1±0.21ms        ? ?/sec    1.01     23.4±0.23ms        ? ?/sec
arrow_reader_clickbench/async/Q13                 1.00     28.3±0.30ms        ? ?/sec    1.02     28.9±0.27ms        ? ?/sec
arrow_reader_clickbench/async/Q14                 1.00     25.2±0.38ms        ? ?/sec    1.02     25.8±0.32ms        ? ?/sec
arrow_reader_clickbench/async/Q19                 1.00      5.6±0.14ms        ? ?/sec    1.02      5.7±0.10ms        ? ?/sec
arrow_reader_clickbench/async/Q20                 1.10   124.7±11.62ms        ? ?/sec    1.00    113.2±0.56ms        ? ?/sec
arrow_reader_clickbench/async/Q21                 1.26    163.3±1.38ms        ? ?/sec    1.00    129.3±0.75ms        ? ?/sec
arrow_reader_clickbench/async/Q22                 1.00   244.0±27.76ms        ? ?/sec    1.17    285.5±2.42ms        ? ?/sec
arrow_reader_clickbench/async/Q23                 1.00    401.6±2.06ms        ? ?/sec    1.01    405.9±3.26ms        ? ?/sec
arrow_reader_clickbench/async/Q24                 1.00     31.2±0.37ms        ? ?/sec    1.02     31.9±0.44ms        ? ?/sec
arrow_reader_clickbench/async/Q27                 1.00     97.1±1.02ms        ? ?/sec    1.02     98.9±0.79ms        ? ?/sec
arrow_reader_clickbench/async/Q28                 1.00     95.5±1.06ms        ? ?/sec    1.02     97.0±1.08ms        ? ?/sec
arrow_reader_clickbench/async/Q30                 1.00     27.5±0.79ms        ? ?/sec    1.02     28.2±0.24ms        ? ?/sec
arrow_reader_clickbench/async/Q36                 1.00    115.4±0.73ms        ? ?/sec    1.01    116.8±0.60ms        ? ?/sec
arrow_reader_clickbench/async/Q37                 1.00     91.5±0.76ms        ? ?/sec    1.01     92.1±0.59ms        ? ?/sec
arrow_reader_clickbench/async/Q38                 1.00     34.9±0.33ms        ? ?/sec    1.02     35.5±0.23ms        ? ?/sec
arrow_reader_clickbench/async/Q39                 1.00     45.4±0.50ms        ? ?/sec    1.02     46.2±0.73ms        ? ?/sec
arrow_reader_clickbench/async/Q40                 1.00     39.9±0.75ms        ? ?/sec    1.02     40.6±0.39ms        ? ?/sec
arrow_reader_clickbench/async/Q41                 1.00     29.2±0.34ms        ? ?/sec    1.02     29.9±0.44ms        ? ?/sec
arrow_reader_clickbench/async/Q42                 1.00     11.1±0.19ms        ? ?/sec    1.02     11.2±0.32ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q1     1.00      2.3±0.02ms        ? ?/sec    1.02      2.3±0.04ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q10    1.00     10.9±0.37ms        ? ?/sec    1.04     11.4±0.36ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q11    1.00     12.4±0.34ms        ? ?/sec    1.04     12.9±0.32ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q12    1.00     22.0±0.31ms        ? ?/sec    1.03     22.6±0.27ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q13    1.00     26.8±0.28ms        ? ?/sec    1.02     27.5±0.33ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q14    1.00     24.4±0.21ms        ? ?/sec    1.03     25.1±0.31ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q19    1.00      5.1±0.09ms        ? ?/sec    1.04      5.3±0.13ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q20    1.00    108.0±0.63ms        ? ?/sec    1.01    109.2±0.64ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q21    1.00    123.2±0.62ms        ? ?/sec    1.01    124.6±0.89ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q22    1.00    226.7±1.62ms        ? ?/sec    1.01    229.5±1.70ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q23    1.03    364.6±2.00ms        ? ?/sec    1.00    353.1±1.71ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q24    1.00     30.0±0.40ms        ? ?/sec    1.02     30.5±0.36ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q27    1.00     93.3±0.59ms        ? ?/sec    1.01     94.0±0.56ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q28    1.00     91.3±0.45ms        ? ?/sec    1.01     92.0±0.62ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q30    1.00     26.4±0.23ms        ? ?/sec    1.03     27.2±0.23ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q36    1.00    110.7±0.68ms        ? ?/sec    1.01    111.8±0.69ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q37    1.00     87.9±0.47ms        ? ?/sec    1.01     88.9±0.52ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q38    1.00     32.0±0.44ms        ? ?/sec    1.01     32.4±0.21ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q39    1.00     40.5±0.39ms        ? ?/sec    1.02     41.1±0.40ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q40    1.00     38.3±0.39ms        ? ?/sec    1.02     38.8±0.83ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q41    1.00     27.8±0.30ms        ? ?/sec    1.01     28.1±0.41ms        ? ?/sec
arrow_reader_clickbench/async_object_store/Q42    1.00     10.4±0.13ms        ? ?/sec    1.01     10.6±0.20ms        ? ?/sec
arrow_reader_clickbench/sync/Q1                   1.00  1992.5±24.58µs        ? ?/sec    1.00  1994.9±12.88µs        ? ?/sec
arrow_reader_clickbench/sync/Q10                  1.00      7.7±0.18ms        ? ?/sec    1.00      7.7±0.09ms        ? ?/sec
arrow_reader_clickbench/sync/Q11                  1.00      9.1±0.17ms        ? ?/sec    1.00      9.2±0.11ms        ? ?/sec
arrow_reader_clickbench/sync/Q12                  1.01     29.6±1.40ms        ? ?/sec    1.00     29.2±0.29ms        ? ?/sec
arrow_reader_clickbench/sync/Q13                  1.00     34.6±0.73ms        ? ?/sec    1.08     37.2±3.86ms        ? ?/sec
arrow_reader_clickbench/sync/Q14                  1.23     39.3±0.89ms        ? ?/sec    1.00     31.8±0.32ms        ? ?/sec
arrow_reader_clickbench/sync/Q19                  1.00      4.2±0.10ms        ? ?/sec    1.03      4.3±0.13ms        ? ?/sec
arrow_reader_clickbench/sync/Q20                  1.00    175.5±0.90ms        ? ?/sec    1.00    174.7±1.07ms        ? ?/sec
arrow_reader_clickbench/sync/Q21                  1.00    226.5±4.98ms        ? ?/sec    1.03    232.7±1.59ms        ? ?/sec
arrow_reader_clickbench/sync/Q22                  1.00    473.5±3.47ms        ? ?/sec    1.00    475.8±3.99ms        ? ?/sec
arrow_reader_clickbench/sync/Q23                  1.00   440.5±17.13ms        ? ?/sec    1.00   440.1±16.17ms        ? ?/sec
arrow_reader_clickbench/sync/Q24                  1.00     40.2±0.41ms        ? ?/sec    1.04     42.0±0.51ms        ? ?/sec
arrow_reader_clickbench/sync/Q27                  1.00    150.9±0.99ms        ? ?/sec    1.02    153.6±1.06ms        ? ?/sec
arrow_reader_clickbench/sync/Q28                  1.00    145.3±1.01ms        ? ?/sec    1.01    146.9±1.17ms        ? ?/sec
arrow_reader_clickbench/sync/Q30                  1.00     28.3±0.30ms        ? ?/sec    1.02     28.7±0.57ms        ? ?/sec
arrow_reader_clickbench/sync/Q36                  1.00    150.5±1.15ms        ? ?/sec    1.01    151.4±1.37ms        ? ?/sec
arrow_reader_clickbench/sync/Q37                  1.00     84.8±0.56ms        ? ?/sec    1.00     84.9±0.84ms        ? ?/sec
arrow_reader_clickbench/sync/Q38                  1.00     28.1±0.16ms        ? ?/sec    1.01     28.3±0.22ms        ? ?/sec
arrow_reader_clickbench/sync/Q39                  1.00     33.6±0.38ms        ? ?/sec    1.00     33.7±0.48ms        ? ?/sec
arrow_reader_clickbench/sync/Q40                  1.00     26.4±0.32ms        ? ?/sec    1.01     26.6±0.36ms        ? ?/sec
arrow_reader_clickbench/sync/Q41                  1.00     27.8±0.33ms        ? ?/sec    1.01     28.0±0.41ms        ? ?/sec
arrow_reader_clickbench/sync/Q42                  1.00     11.8±0.11ms        ? ?/sec    1.01     12.0±0.11ms        ? ?/sec