perf(over window): O(1) impl for delta_btree_map::CursorWithDelta::move_next
#19214
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stdrc
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delta_btree_map::CursorWithDelta::move_next
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Signed-off-by: Richard Chien <[email protected]>
Signed-off-by: Richard Chien <[email protected]>
Signed-off-by: Richard Chien <[email protected]>
Signed-off-by: Richard Chien <[email protected]>
Signed-off-by: Richard Chien <[email protected]>
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BugenZhao
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BugenZhao
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…ove_next ` (#19214) Signed-off-by: Richard Chien <[email protected]>
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What's changed and what's your intention?
Previous implementation of
CursorWithDeltaused a O(logN) algorithm inmove_nextandmove_prev. This PR replace them with a O(1) algorithm utilizingbtree_map::Cursor.A local performance benchmark running a user-provided query showed a significant improvement.
Before:
After:
Average inflight barrier number dropped 30.7%, p99 barrier latency dropped 30%, source throughput increased 24.8%.
Checklist
./risedev check(or alias,./risedev c)Documentation
Release note
If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.