coderfender commented on PR #21561:
URL: https://github.com/apache/datafusion/pull/21561#issuecomment-4263938330
@Dandandan true! I also benchmarked through `cargo bench` and the results
are similar :
Benchmark PR is approved and ready to be merged to main for better
comparison though
```
group groups_accumulator_hash_table
main
----- -----------------------------
----
count_distinct_groups g10000_high_skewed 1.00 50.0±0.69µs ?
?/sec 31.19 1558.7±19.53µs ? ?/sec
count_distinct_groups g10000_high_uniform 1.00 82.9±0.98µs ?
?/sec 19.69 1632.0±36.13µs ? ?/sec
count_distinct_groups g10000_low_skewed 1.00 48.5±0.48µs ?
?/sec 31.25 1514.7±31.43µs ? ?/sec
count_distinct_groups g10000_low_uniform 1.00 82.6±0.85µs ?
?/sec 19.34 1596.9±17.45µs ? ?/sec
count_distinct_groups g10000_mid_skewed 1.00 50.1±0.40µs ?
?/sec 30.94 1551.5±10.96µs ? ?/sec
count_distinct_groups g10000_mid_uniform 1.00 83.9±1.44µs ?
?/sec 19.10 1601.5±19.65µs ? ?/sec
count_distinct_groups g1000_high_skewed 1.00 48.6±0.86µs ?
?/sec 4.82 234.4±2.02µs ? ?/sec
count_distinct_groups g1000_high_uniform 1.00 80.7±0.72µs ?
?/sec 3.33 268.7±4.11µs ? ?/sec
count_distinct_groups g1000_low_skewed 1.00 32.4±0.22µs ?
?/sec 6.30 204.0±7.65µs ? ?/sec
count_distinct_groups g1000_low_uniform 1.00 80.5±0.86µs ?
?/sec 3.29 265.1±2.39µs ? ?/sec
count_distinct_groups g1000_mid_skewed 1.00 48.4±0.64µs ?
?/sec 4.75 229.6±1.71µs ? ?/sec
count_distinct_groups g1000_mid_uniform 1.00 80.7±0.61µs ?
?/sec 3.32 267.4±2.67µs ? ?/sec
count_distinct_groups g100_high_skewed 1.00 48.8±1.41µs ?
?/sec 1.80 87.8±1.53µs ? ?/sec
count_distinct_groups g100_high_uniform 1.00 80.7±0.88µs ?
?/sec 1.32 106.2±3.51µs ? ?/sec
count_distinct_groups g100_low_skewed 1.00 33.1±0.20µs ?
?/sec 1.65 54.7±0.52µs ? ?/sec
count_distinct_groups g100_low_uniform 1.00 81.0±1.66µs ?
?/sec 1.29 104.5±0.65µs ? ?/sec
count_distinct_groups g100_mid_skewed 1.00 48.0±0.64µs ?
?/sec 1.60 76.7±1.42µs ? ?/sec
count_distinct_groups g100_mid_uniform 1.00 80.2±0.64µs ?
?/sec 1.30 104.5±1.71µs ? ?/sec
```
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