Mryange opened a new pull request, #64913:
URL: https://github.com/apache/doris/pull/64913
### What problem does this PR solve?
Array aggregate functions such as `array_avg`, `array_sum`, `array_min`,
`array_max`, and `array_product` previously evaluated each array by creating
and driving the generic aggregate-function path. This added unnecessary per-row
aggregate state, arena, nullable wrapper, and virtual-call overhead for simple
array-local reductions.
Root cause: array aggregation reused the general aggregate-function
execution machinery even though these functions only need a small per-row
reduction state over the nested array data.
This change adds a direct `ColumnArrayView` based fast path with lightweight
`ArrayAggState` reducers for sum, avg, min, max, and product. DecimalV3
sum/avg/product keep using the FE-planned result type and scale, while ordinary
array-mapped functions now trust the FE return type instead of reconstructing a
BE-side aggregate function only for return-type checking.
Local optest result for `array/array_avg_arr` improved from about 1.685s to
0.85-0.91s in warm runs.
### 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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