sohardforaname opened a new pull request, #22876:
URL: https://github.com/apache/doris/pull/22876
## Proposed changes
Issue Number: close #xxx
<!--Describe your changes.-->
the global limit will create a gather action, and all the data will be
calculated in one instance. If we push down the global limit, the node run
after the limit node will run slowly.
We fix it by push down only local limit.
a join plan tree before fixing:
```
LogicalLimit(global)
LogicalLimit(local)
Plan()
LogicalLimit(global)
LogicalLimit(local)
LogicalJoin
LogicalLimit(global)
LogicalLimit(local)
Plan()
LogicalLimit(global)
LogicalLimit(local)
Plan()
after fixing:
LogicalLimit(global)
LogicalLimit(local)
Plan()
LogicalLimit(local)
LogicalJoin
LogicalLimit(local)
Plan()
LogicalLimit(local)
Plan()
```
## Further comments
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[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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