yujun777 opened a new pull request, #55415:
URL: https://github.com/apache/doris/pull/55415
### What problem does this PR solve?
when merge project, if the slot reference in parent project exists multiple
times, and the slot reference's origin expression contains unique expression,
then shouldn't merge these projects, otherwise be will calculate the unique
function multiple time.
for example:
```
LogicalProject( k + k)
|
LogicalProject(random() as k)
```
after merge project, it will got:
```
LogicalProject(random() + random())
```
then be wil calcute twice random() for each row.
relate PR: #43546
### 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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