XieJiann opened a new pull request, #36035:
URL: https://github.com/apache/doris/pull/36035
## Proposed changes
This PR optimizes query performance by pushing down aggregations through
joins when grouped by a foreign key. This adjustment reduces data processing
overhead above the join, improving both speed and resource efficiency.
Transformation Example:
Before Optimization:
```
Aggregation(group by fk)
|
Join(pk = fk)
/ \
pk fk
```
After Optimization:
```
Join(pk = fk)
/ \
pk Aggregation(group by fk)
|
fk
```
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