englefly opened a new pull request, #64330:
URL: https://github.com/apache/doris/pull/64330
### What problem does this PR solve?
When projects below TopN are simplified by NestedColumnPruning, the
above-TopN project may hold Aliases whose children reference intermediate
slots (e.g. element_at results) that were removed from the child output.
This caused CheckAfterRewrite failures because those slots could not be
found in the rewritten plan output.
Changes:
1. Register intermediate alias-to-slot mappings so chain resolution
(v1#4 → SlotRef#10 → ElementAt(sa#1,fa)) works correctly
2. When an expression is pulled above TopN via chain resolution, only
keep base slots in the lower project to avoid duplicate computation
3. Skip pass-through for intermediate expression slots that were
simplified away — their computation is covered by pulled-up aliases
4. Re-add current TopN output slots (e.g. base structs for lazy mat)
that are not already in upperOutput
Added testPullUpChainedExpressionsThroughJoinAndTopN to cover this
scenario.
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
- [ ] 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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