924060929 opened a new pull request, #65129:
URL: https://github.com/apache/doris/pull/65129
### What problem does this PR solve?
Related PR: #59006, #60823
Problem Summary:
Re-enable bucket shuffle for set operation (union / intersect / except).
This optimization was introduced by #59006 and later disabled by #60823,
because at that time the backend could not plan the correct local shuffle type
for set operation, which produced wrong results. Now that planning local
shuffle in the frontend is supported, the frontend plans the correct local
shuffle type, so it is safe to re-enable this feature.
When `enable_local_shuffle_planner` is enabled (the default), the optimizer
keeps the distribution of the largest natural / storage-bucketed child of a set
operation and bucket-shuffles the other children onto it (the same idea as
bucket shuffle join), which avoids a full reshuffle of the largest side. When
it is disabled, the previous full-shuffle behavior is kept, so this change is
gated and only takes effect with the frontend local shuffle planner.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] 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:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] 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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