yujun777 opened a new pull request, #63403:
URL: https://github.com/apache/doris/pull/63403
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #62698
Problem Summary:
PR #62698 introduced the UDF volatility property and added
`VolatileExpression` / `VolatileIdentity` so volatile UDF calls can carry
per-call identity and avoid unsafe optimizer rewrites.
This PR is a follow-up refactoring for that change. It removes duplicated
unique identity state from `UniqueFunction`, keeps `VolatileIdentity` as the
single identity holder, moves volatile-expression helper methods into
`ExpressionTrait`, and expands the former `AddProjectForUniqueFunction` rewrite
to operate on volatile expressions rather than only unique functions.
### Release note
None
### Check List (For Author)
- Test
- [ ] Regression test
- [x] Unit Test
- `AddProjectForVolatileExpressionTest`
- `UdfVolatilityTest`
- `UniqueFunctionTest`
- [ ] 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
- 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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