924060929 opened a new pull request, #62054:
URL: https://github.com/apache/doris/pull/62054
ExchangeNode.toThrift: remove hasSerialScanNode() from is_serial condition.
is_serial is a per-operator property — only UNPARTITIONED or
use_serial_exchange exchanges should be serial. Scan seriality is handled
independently by the scan pipeline's num_tasks. The previous code incorrectly
propagated scan seriality to the exchange, causing bucket shuffle exchange to
bottleneck on 1 task per BE.
Add unit tests:
- ExchangeNodeSerialTest: verify is_serial for all exchange types × pooling
combos
- BucketShuffleDestinationTest: verify destinations count = bucketNum and
same-worker buckets point to same first instance
### 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
- [x] 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)
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