Reenable the append tree and change metrics to use the append tree #661
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Benchmark
| Benchmark suite | Current: 7121b1d | Previous: 4ae8b85 | Ratio |
|---|---|---|---|
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.InnerJoin |
555691350 ns (± 6861273.865273541) |
592945200 ns (± 35581532.03160469) |
0.94 |
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.LeftJoin |
666499380 ns (± 35172344.0332442) |
658813590 ns (± 45349397.746520415) |
1.01 |
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ProjectionAndNormalization |
205593560 ns (± 16563252.26646828) |
201853112.5 ns (± 5564610.621581839) |
1.02 |
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.SumAggregation |
236603690 ns (± 12084614.155514715) |
228276677.7777778 ns (± 6383403.230796598) |
1.04 |
FlowtideDotNet.Benchmarks.Stream.StreamBenchmark.ListAggWithMapAggregation |
2279663930 ns (± 103394319.08778268) |
2311069716.6666665 ns (± 65590138.42863499) |
0.99 |
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The append tree is a special case of the B+ tree which fills a page completely and instead of splitting it creates a new page on the right.
This means that page will be packed exactly to the limit which helps reduce the amount of pages.
Searching is still as quick as the B+ tree.
It is possible to prune from the left of the tree where entire leaf pages are removed if all values in the leaf page are in the pruning range. This allows pruning to be done without loading the actual leaf page from persistent or temporary disk storage.