englefly opened a new pull request, #61183:
URL: https://github.com/apache/doris/pull/61183
### What problem does this PR solve?
Add a new Nereids rewrite rule that replaces simple aggregate queries
(COUNT(*)/COUNT(not-null-col)/MIN/MAX without GROUP BY) on DUP_KEYS OlapTable
with pre-computed constant values from an async Caffeine cache.
Key components:
- SimpleAggCacheMgr: singleton async cache backed by internal SQL queries
for exact MIN/MAX column stats and row counts. Uses version double-check
(getVisibleVersionTime before and after SQL) to ensure cache consistency.
Invalidates on empty, stale, or exception results.
- RewriteSimpleAggToConstantRule: Nereids rewrite rule that fires on
LogicalAggregate over LogicalOlapScan, checks DUP_KEYS model, no GROUP BY,
supported agg functions, and replaces with LogicalOneRowRelation containing
constant literals.
- Unit test with mock cache covering 6 positive and 8 negative cases.
- Regression test with cache warmup polling, positive/negative explain
checks, correctness assertions, and disable-rule verification.
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### 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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