Gabriel39 opened a new pull request, #68231:
URL: https://github.com/apache/doris/pull/68231
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary:
External scanner metadata was returned in tuple-slot order while Arrow
batches from the memory scratch sink followed fragment output expression order.
Reordered projections could therefore bind values to the wrong columns.
Build the selected-column schema from the fragment output slot references so
metadata and data use the same order. Add a BE unit test that projects two
slots in reverse descriptor order and verifies the returned names and types
follow the projection.
### Release note
Fix external scanner reads with reordered projected columns.
### Check List (For Author)
- Test
- [ ] Regression test
- [x] Unit Test
-
`FragmentMgrExternalScanTest.SelectedColumnsFollowOutputExpressionOrder`
- [ ] Manual test
- [ ] No need to test or manual test.
- Behavior changed:
- [ ] No.
- [x] Yes. External scanner schema now follows projection order.
- 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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