shuke987 opened a new pull request, #65655:
URL: https://github.com/apache/doris/pull/65655
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #65445
Problem Summary:
Backport #65445 to branch-4.0.
The regression case `test_scale_num_nulls` depends on asynchronously visible
physical row counts. When the physical row count is still 0, Nereids scales the
selected-partition column statistics to 0 even though the injected
partition/table statistics are correct, making the case flaky.
Replace the environment-dependent Groovy regression case with a
deterministic FE unit test that directly constructs the partition/table
statistics and verifies selected-partition scaling, including row count, NDV,
min/max, count, and numNulls.
### Release note
None
### Check List (For Author)
- Test
- [ ] 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
Local validation:
-
`StatsCalculatorTest#testComputeOlapScanScalesNumNullsForSelectedPartitions`:
passed (1 test)
- `StatsCalculatorTest`: passed (17 tests)
- `mvn -pl fe-core -am checkstyle:check`: passed (0 violations)
- Behavior changed:
- [x] No.
- [ ] Yes.
- 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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