branch-4.1: [fix](exec) preserve NULL in pushed-down CHAR MIN/MAX #65952 - #66583
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### What problem does this PR solve?
Problem Summary: `MIN` on a nullable CHAR column could return an empty
string when string min/max aggregation was pushed down to multiple
tablets. The zone-map reader produced NULL correctly, but the CHAR
padding cleanup rebuilt each value through a non-null `Field`,
converting `StringRef{nullptr, 0}` into an empty string. Preserve the
original StringRef through `insert_data()` so NULL remains NULL while
CHAR padding is still removed.
### Release note
Fix incorrect `MIN` results for nullable CHAR columns when min/max
aggregation pushdown is enabled.
### 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:
apache/doris-website#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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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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run buildall |
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skip buildall |
yiguolei
approved these changes
Aug 8, 2026
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Cherry-picked from #65952