csun5285 opened a new pull request, #69696:
URL: https://github.com/apache/doris/pull/69696
### What problem does this PR solve?
Issue Number: None
Related PR: #65396
Problem Summary: Ordered reads of nested struct fields over a rowset with
multiple overlapping segments use pruned sub-column iterators, but the merge
reader creates its intermediate blocks from the full physical schema. The
mismatched child layouts can decode strings into numeric columns, return the
wrong fields, or crash the BE. Backport the merge-block portion of #65396 to
branch-4.2: use the FE-pruned type by column unique ID when constructing merge
blocks, retaining the physical type for unpruned columns. Include focused unit
and regression coverage for block reuse and nested field reads.
### Release note
Fix errors and BE crashes when ordered scans read pruned complex columns
across overlapping segments.
### Check List (For Author)
- Test:
- ASAN BE build and FE build.
- Unit test: VGenericIteratorsTest.*, all 7 tests passed.
- Regression test:
fault_injection_p0/test_topn_pruned_struct_overlapping_segments. The original
merge-block construction reproduced E-3110 for TINYINT; the same suite passed
all 4 queries after restoring the fix.
- Regenerated the expected output with the regression script; it matches
the original PR's corresponding generated output byte for byte.
- clang-format 16 passed. clang-tidy found no diagnostics on changed
lines; its full run is blocked by an existing unmatched NOLINTEND in
core/types.h.
- Behavior changed: Yes. Merge blocks use the requested pruned complex types.
- Does this need documentation: No
Partial backport of 3c43f4cd96d8041713391701fe6746c40fba6708 (merge blocks).
### What problem does this PR solve?
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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