suxiaogang223 opened a new pull request, #63478:
URL: https://github.com/apache/doris/pull/63478
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary: Hive external table row count estimation falls back to
listing partition files when HMS row count and size statistics are missing. The
fallback path always bypassed the Hive partition and file metadata caches, so a
normal query could read partition and file metadata during CBO and then read
the same metadata again during scan planning. This patch distinguishes row
count cache load contexts: query planning can let Hive row count estimation
populate partition/file caches for scan reuse, while SHOW and
information_schema style cached-row-count requests keep the no-heavy-cache
behavior to avoid metadata cache pollution.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [x] Unit Test
- `./run-fe-ut.sh --run
org.apache.doris.datasource.ExternalRowCountCacheTest`
- [ ] 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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