2010YOUY01 commented on PR #22921:
URL: https://github.com/apache/datafusion/pull/22921#issuecomment-4718277738
> ```
>
> Details
>
> ```
> group HEAD
cleanup-approx-distinct
> ----- ----
-----------------------
> approx_distinct i16 bitmap 1.00 5.9±0.01µs
? ?/sec 1.01 6.0±0.14µs ? ?/sec
> approx_distinct i64 80% distinct 1.00 12.8±0.01µs
? ?/sec 1.00 12.8±0.01µs ? ?/sec
> approx_distinct i64 99% distinct 1.00 12.9±0.03µs
? ?/sec 1.00 12.8±0.01µs ? ?/sec
> approx_distinct i8 bitmap 1.00 4.4±0.00µs
? ?/sec 1.00 4.4±0.01µs ? ?/sec
> approx_distinct u16 bitmap 1.21 7.2±0.22µs
? ?/sec 1.00 5.9±0.01µs ? ?/sec
> approx_distinct u8 bitmap 1.00 4.4±0.00µs
? ?/sec 1.00 4.4±0.01µs ? ?/sec
> approx_distinct utf8 long 80% distinct 1.17 38.6±0.03µs
? ?/sec 1.00 33.0±0.05µs ? ?/sec
> approx_distinct utf8 long 99% distinct 1.20 39.1±0.03µs
? ?/sec 1.00 32.6±0.27µs ? ?/sec
> approx_distinct utf8 short 80% distinct 1.06 25.7±0.03µs
? ?/sec 1.00 24.3±0.02µs ? ?/sec
> approx_distinct utf8 short 99% distinct 1.06 25.8±0.03µs
? ?/sec 1.00 24.3±0.02µs ? ?/sec
> approx_distinct utf8view long 80% distinct 1.08 42.4±0.03µs
? ?/sec 1.00 39.1±0.02µs ? ?/sec
> approx_distinct utf8view long 99% distinct 1.09 42.5±0.09µs
? ?/sec 1.00 39.1±0.02µs ? ?/sec
> approx_distinct utf8view short 80% distinct 1.00 14.0±0.04µs
? ?/sec 1.18 16.6±0.01µs ? ?/sec
> approx_distinct utf8view short 99% distinct 1.00 14.1±0.01µs
? ?/sec 1.18 16.6±0.01µs ? ?/sec
> approx_distinct_grouped/Int64 50000 groups 1.17 26.6±0.53ms
? ?/sec 1.00 22.8±0.06ms ? ?/sec
> approx_distinct_grouped/Utf8 50000 groups 1.24 28.9±0.40ms
? ?/sec 1.00 23.3±0.16ms ? ?/sec
> approx_distinct_grouped/Utf8View 50000 groups 1.22 27.6±0.41ms
? ?/sec 1.00 22.6±0.03ms ? ?/sec
> ```
Interesting, it's slightly faster than my local runs.
It seems to vary by around +-20% when the benchmark is run on different
hardware.
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