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yiguolei merged 1 commit into from
Nov 8, 2025
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branch-4.0: [ann] Ann index only scan #57243 #57758

yiguolei merged 1 commit into from
Nov 8, 2025

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@zhiqiang-hhhh zhiqiang-hhhh commented Nov 6, 2025

cherry pick from #57243

@zhiqiang-hhhh
[ann] Ann index only scan (apache#57243)
307a1a1 
This PR introduces **ANN index-only scan** to avoid reading the array
column when it is not included in the projection.
Currently, nearly **half of the total CPU cost** is spent on reading the
array column.

![img_v3_02rb_21c39870-9c59-4565-8c38-ff1acd93938g](https://github.com/user-attachments/assets/71b73a8d-05a2-40e1-8202-b5870b9aa7b6)

In addition, the data pages of the array column consume a large amount
of memory.
By adopting index-only scan, both **CPU usage** and **memory footprint**
can be significantly reduced.

---
concurrency = 30, 60, 80)

**Before this PR:**

```
"conc_qps_list": [336.4794, 635.5969, 601.952],
"conc_latency_p99_list": [0.7159, 0.1690, 0.2239],
"conc_latency_p95_list": [0.0957, 0.1442, 0.1904],
"conc_latency_avg_list": [0.0889, 0.0940, 0.1320]
```

**After this PR:**

```
"conc_qps_list": [501.4105, 832.0482, 899.8662],
"conc_latency_p99_list": [0.0763, 0.1302, 0.1780],
"conc_latency_p95_list": [0.0666, 0.1041, 0.1465],
"conc_latency_avg_list": [0.0597, 0.0716, 0.0881]
```

This represents a **20%–50% improvement** in QPS and latency.

---

The chart below shows that **CPU cost decreases by ~17%** and **memory
consumption decreases by ~50%** after this optimization.
(Left side: after this PR)

![Performance
comparison](https://github.com/user-attachments/assets/a2fcfcc3-52e3-4c22-95ae-79612ffb197c)
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zhiqiang-hhhh commented Nov 6, 2025

run buildall

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hello-stephen commented Nov 6, 2025

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

  1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
  2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
  3. What features were added. Why was this function added?
  4. Which code was refactored and why was this part of the code refactored?
  5. Which functions were optimized and what is the difference before and after the optimization?

@github-actions github-actions bot added the approved Indicates a PR has been approved by one committer. label Nov 8, 2025
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github-actions bot commented Nov 8, 2025

PR approved by at least one committer and no changes requested.

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github-actions bot commented Nov 8, 2025

PR approved by anyone and no changes requested.

@yiguolei yiguolei merged commit 1731994 into apache:branch-4.0 Nov 8, 2025
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