kaka11chen opened a new pull request, #64555:
URL: https://github.com/apache/doris/pull/64555
…r. (#64243)
Issue Number: None
Related PR: None
Problem Summary:
When ANN TopN or ANN range search already has a small candidate set after
previous filtering, continuing to load and search the ANN index can be
unnecessary and may cost more than exact vector
evaluation.
This PR adds session variables to control small-candidate fallback for ANN
search:
- `ann_index_candidate_rows_threshold`: absolute candidate row threshold,
`0` disables it
- `ann_index_candidate_rows_percent_threshold`: candidate ratio threshold
against segment rows
For ANN TopN, the previous fixed `30%` fallback rule is replaced by the
shared threshold helper. For ANN range search, the same helper is applied
before ANN index loading/searching. When fallback is triggered, Doris skips ANN
index search and continues with exact vector distance evaluation.
This PR also adds profile counters for observability:
- `AnnIndexTopNFallbackBySmallCandidateCnt`
- `AnnIndexTopNFallbackSmallCandidateRows`
- `AnnIndexRangeFallbackBySmallCandidateCnt`
- `AnnIndexRangeFallbackSmallCandidateRows`
### Release note
ANN TopN and ANN range search can now skip ANN index search when candidate
rows are below configurable small-candidate thresholds.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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