xy720 opened a new pull request, #67542:
URL: https://github.com/apache/doris/pull/67542
### What problem does this PR solve?
Problem Summary:
在存算分离架构中， CloudTabletStatMgr 尚未从 MetaService 拉到最新 tablet stats
的窗口内，OlapAnalysisTask 会拿到 rowCount=0 的过期快照，走进短路分支，直接把
count=0/ndv=0/min/max=null 的空 col stats
写进__internal_schema.column_statistics，污染 CBO 直到下一次成功 analyze 覆盖。
例子：
T1 : 创建新物化视图 mv_a 并刷新完成，
T2: 触发 ANALYZE，此时 CloudTabletStatMgr 尚未拉取最新rowcount，isEmptyTable 判空，写入空 col
stats
T3: 基于 mv_a 的下游 mv_b 开始刷新，上游 mv 的空 col stats 使估算 cardinality=1，join order
选错，产出 BROADCAST 大表 plan，MEM_LIMIT_EXCEEDED
T4: 手动重跑 analyze 覆盖空 col stats 才恢复
修复：
仅当所有 partition 的 visibleVersion 仍为 PARTITION_INIT_VERSION（真正从未 load 过）才允许写空
stats
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] 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:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] 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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