feiniaofeiafei opened a new pull request, #65099:
URL: https://github.com/apache/doris/pull/65099
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: The distinct aggregation pushdown used a separate
cost-based rewrite and supported only one distinct aggregate. Move pure
distinct aggregation into eager aggregation so statistics decide whether to
deduplicate below joins. Support multiple SUM/COUNT distinct aggregates with
identical keys and multi-column COUNT DISTINCT while keeping the upper distinct
aggregate unchanged. Queries containing non-distinct aggregates or different
distinct keys are not rewritten.
### Release note
Use statistics-driven eager aggregation for pure same-key distinct
aggregates across joins.
### 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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