coderfender commented on PR #21453:
URL: https://github.com/apache/datafusion/pull/21453#issuecomment-4272996698
Ahh I see . I was trying compare benchmarks FYI but let me try and switch to
using count distinct then
```
group after_cold
before
----- ----------
------
approx_distinct i16 bitmap 1.00 3.0±0.11µs ?
?/sec 1.92 5.7±0.17µs ? ?/sec
approx_distinct i64 80% distinct 1.02 5.7±0.04µs ?
?/sec 1.00 5.6±0.08µs ? ?/sec
approx_distinct i64 99% distinct 1.01 5.8±0.06µs ?
?/sec 1.00 5.7±0.21µs ? ?/sec
approx_distinct i8 bitmap 1.00 1103.7±5.90ns ?
?/sec 5.35 5.9±0.24µs ? ?/sec
approx_distinct u16 bitmap 1.00 3.9±0.23µs ?
?/sec 1.51 5.9±0.15µs ? ?/sec
approx_distinct u8 bitmap 1.00 1142.4±117.79ns
? ?/sec 5.00 5.7±0.08µs ? ?/sec
approx_distinct utf8 long 80% distinct 1.01 16.1±0.32µs ?
?/sec 1.00 16.0±0.08µs ? ?/sec
approx_distinct utf8 long 99% distinct 1.00 16.1±0.41µs ?
?/sec 1.01 16.3±0.51µs ? ?/sec
approx_distinct utf8 short 80% distinct 1.00 10.9±0.21µs ?
?/sec 1.01 11.0±0.81µs ? ?/sec
approx_distinct utf8 short 99% distinct 1.01 11.0±0.06µs ?
?/sec 1.00 10.9±0.43µs ? ?/sec
approx_distinct utf8view long 80% distinct 1.00 18.4±0.32µs ?
?/sec 1.01 18.7±0.51µs ? ?/sec
approx_distinct utf8view long 99% distinct 1.00 18.5±0.14µs ?
?/sec 1.01 18.6±0.33µs ? ?/sec
approx_distinct utf8view short 80% distinct 1.02 6.2±0.10µs ?
?/sec 1.00 6.0±0.39µs ? ?/sec
approx_distinct utf8view short 99% distinct 1.07 6.4±0.25µs ?
?/sec 1.00 6.0±0.15µs ? ?/sec
```
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