Union with serialized bitmap

[forsaken628]

This PR is related to #263 , #281 and the computation process was refactored using the Visitor pattern to facilitate future extensions

[Kerollmops]

Hey @forsaken628 👋

Thank you for the proposal. However, I doubt that there is a performance gain. Could you please set up some benchmarks and run them?

Have a nice day 🌵

[forsaken628]

There are performance improvements for heavy computation and some regressions for light computation

pairwise_intersection_with_serialized_unchecked/ref_own/census-income
                        time:   [1.3265 ms 1.3423 ms 1.3624 ms]
                        change: [-3.9036% -2.6485% -1.1383%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
  1 (1.00%) high mild
  2 (2.00%) high severe
Benchmarking pairwise_intersection_with_serialized_unchecked/ref_own/census-income_srt: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 8.0s, enable flat sampling, or reduce sample count to 50.
pairwise_intersection_with_serialized_unchecked/ref_own/census-income_srt
                        time:   [762.64 µs 775.15 µs 785.99 µs]
                        change: [-2.0298% +0.5733% +3.1849%] (p = 0.66 > 0.05)
                        No change in performance detected.
Benchmarking pairwise_intersection_with_serialized_unchecked/ref_own/census1881: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 5.4s, enable flat sampling, or reduce sample count to 60.
pairwise_intersection_with_serialized_unchecked/ref_own/census1881
                        time:   [156.06 µs 160.07 µs 163.52 µs]
                        change: [-22.497% -5.9705% +6.8403%] (p = 0.69 > 0.05)
                        No change in performance detected.
pairwise_intersection_with_serialized_unchecked/ref_own/census1881_srt
                        time:   [103.83 µs 106.85 µs 109.57 µs]
                        change: [+1.7995% +10.292% +16.093%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 7 outliers among 100 measurements (7.00%)
  7 (7.00%) high mild
pairwise_intersection_with_serialized_unchecked/ref_own/weather_sept_85
                        time:   [5.8185 ms 5.8632 ms 5.9071 ms]
                        change: [-2.6190% -1.9004% -1.2175%] (p = 0.00 < 0.05)
                        Performance has improved.
pairwise_intersection_with_serialized_unchecked/ref_own/weather_sept_85_srt
                        time:   [1.3805 ms 1.3910 ms 1.4014 ms]
                        change: [+0.0140% +0.7875% +1.6099%] (p = 0.06 > 0.05)
                        No change in performance detected.
pairwise_intersection_with_serialized_unchecked/ref_own/wikileaks-noquotes
                        time:   [314.08 µs 317.08 µs 320.27 µs]
                        change: [+1.3629% +2.8094% +5.0484%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 5 outliers among 100 measurements (5.00%)
  4 (4.00%) high mild
  1 (1.00%) high severe
pairwise_intersection_with_serialized_unchecked/ref_own/wikileaks-noquotes_srt
                        time:   [153.52 µs 155.01 µs 156.37 µs]
                        change: [+3.5969% +4.7044% +5.9526%] (p = 0.00 < 0.05)
                        Performance has regressed.