coderfender commented on PR #21453:
URL: https://github.com/apache/datafusion/pull/21453#issuecomment-4204541389
`critcmp` results :
u16 / i16 are `2X faster` :)
```
critcmp bitmap main
group bitmap
main
----- ------
----
approx_distinct i16 bitmap 1.00 3.0±0.01µs ?
?/sec 2.00 5.9±0.08µs ? ?/sec
approx_distinct i64 80% distinct 1.00 5.6±0.15µs ?
?/sec 1.03 5.8±0.14µs ? ?/sec
approx_distinct i64 99% distinct 1.00 5.8±0.12µs ?
?/sec 1.01 5.8±0.17µs ? ?/sec
approx_distinct i8 bitmap 1.00 6.0±0.28µs ?
?/sec 1.00 5.9±0.06µs ? ?/sec
approx_distinct u16 bitmap 1.00 3.0±0.24µs ?
?/sec 1.93 5.8±0.23µs ? ?/sec
approx_distinct u8 bitmap 1.00 5.8±0.08µs ?
?/sec 1.01 5.8±0.34µs ? ?/sec
approx_distinct utf8 long 80% distinct 1.00 16.3±0.08µs ?
?/sec 1.00 16.2±0.49µs ? ?/sec
approx_distinct utf8 long 99% distinct 1.01 16.3±0.05µs ?
?/sec 1.00 16.2±0.23µs ? ?/sec
approx_distinct utf8 short 80% distinct 1.02 11.1±0.14µs ?
?/sec 1.00 11.0±0.08µs ? ?/sec
approx_distinct utf8 short 99% distinct 1.01 11.2±0.67µs ?
?/sec 1.00 11.0±0.48µs ? ?/sec
approx_distinct utf8view long 80% distinct 1.04 19.7±0.58µs ?
?/sec 1.00 19.0±0.49µs ? ?/sec
approx_distinct utf8view long 99% distinct 1.04 19.7±0.35µs ?
?/sec 1.00 19.0±0.19µs ? ?/sec
approx_distinct utf8view short 80% distinct 1.00 6.3±0.06µs ?
?/sec 1.00 6.3±0.40µs ? ?/sec
approx_distinct utf8view short 99% distinct 1.02 6.4±0.17µs ?
?/sec 1.00 6.2±0.22µs ? ?/sec
```
cc : @neilconway , @Dandandan
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