eldenmoon opened a new pull request, #67423:
URL: https://github.com/apache/doris/pull/67423
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: VariantAssembler scanned every flat materialized path for
every row even when only a small fraction of paths were present. This change
builds a batch-local active-slot index only for the narrow whole-root, flat,
non-conflicting layout and keeps all other layouts on the existing generic
path. On the fixed 10 GB workload with 2,000 materialized paths and 20 values
per row, the wall median decreases from 77.7376 to 75.0729 seconds and BE CPU
decreases from 245.04 to 227.51 core-seconds, improvements of 3.43% and 7.15%
respectively.
### Release note
None
### Check List (For Author)
- Test
- [ ] Regression test
- [x] Unit Test
- ASAN BE UT: `VariantAssemblerLegacyTest.*`, 33/33 passed.
- [x] Manual test
- One warmup and three measured trials on the fixed 10 GB sparse
workload.
- [ ] No need to test or manual test. Explain why:
- Behavior changed:
- [x] No.
- [ ] Yes.
- Does this need documentation?
- [x] No.
- [ ] Yes.
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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