Yukang-Lian opened a new pull request, #67608:
URL: https://github.com/apache/doris/pull/67608
### What problem does this PR solve?
Issue Number: None
Related PR: #64312
Problem Summary: Backport the Cloud schema-change base-tablet refresh fix
from #64312 to `branch-3.1`.
Before capturing rowset readers and registering schema change V1, the base
tablet now performs an uncapped rowset refresh. This prevents a stale request
alter version from hiding newer visible rowsets across retries. The
implementation is adapted to this branch's older `CloudTablet::sync_rowsets()`
API.
The master regression fixture depends on later cross-V1 test infrastructure
that is absent from this branch, so this backport keeps the production fix and
its diagnostic debug point without importing unsupported test scaffolding.
The branch is rebased onto the latest `branch-3.1`.
### Release note
Refresh the Cloud schema-change base tablet before calculating and
registering V1.
### Check List (For Author)
- Test: Manual / static validation
- `clang-format` 16 `--dry-run --Werror`: passed for all changed C++
files
- `git diff --check`: passed
- Exact-base linked BE tests were not run locally; hosted CI is
requested with `run buildall`
- Behavior changed: Yes
- Schema change uses the latest visible base-tablet rowsets instead of a
query-version-capped refresh
- Does this need documentation: No
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