Mryange opened a new pull request, #65367:
URL: https://github.com/apache/doris/pull/65367
### What problem does this PR solve?
Some column execution paths copied full column data even when the result
could safely share existing column storage and rely on COW before mutation.
Root cause: projection, partition filtering, array offsets, and null-condition
IF handling used clone_resized() as a defensive ownership boundary.
This change removes those redundant clones by reusing expression result
columns directly, sharing array offsets in array_map, filtering copied blocks
through the existing COW-aware block filter path, and reusing the else column
when an IF condition is entirely null.
### 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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