yujun777 opened a new pull request, #55716:
URL: https://github.com/apache/doris/pull/55716
### What problem does this PR solve?
if a sub expression exists multiple time in filter, rule
PushDownVirtualColumnsIntoOlapScan will extract it as a virtual slot and push
it into olap scan.
but if this sub expression itself contains an unique function which exists
multiple times, then it should not push into olap scan, rule
AddProjectForUniqueFunction will extract the unique function for it.
But we can't construct a real example SQL satisfy the above case, maybe
it's not exists, so we don't add a real SQL regression test, we just test it
with fe ut.
### 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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