924060929 opened a new pull request, #17579:
URL: https://github.com/apache/doris/pull/17579
# Proposed changes
This pr refactor the column pruning by the visitor, the good sides
1. easy to provide ability of column pruning for new plan by implement the
interface `OutputPrunable`, don't need to add new rule like
`PruneXxxChildColumns`
2. support shrink output field in some plans, this can skip some useless
operation so improvement
example:
```sql
select id
from (
select id, sum(age)
from student
)a
```
we should prune the useless `sum (age)` in the aggregate.
before refactor:
```
LogicalProject ( distinct=false, projects=[id#0], excepts=[],
canEliminate=true )
+--LogicalSubQueryAlias ( qualifier=[a] )
+--LogicalAggregate ( groupByExpr=[], outputExpr=[id#0, sum(age#2) AS
`sum(age)`#4], hasRepeat=false )
+--LogicalProject ( distinct=false, projects=[id#0, age#2],
excepts=[], canEliminate=true )
+--LogicalOlapScan ( qualified=default_cluster:test.student,
indexName=<index_not_selected>, selectedIndexId=10007, preAgg=ON )
```
after refactor:
```
LogicalProject ( distinct=false, projects=[id#0], excepts=[],
canEliminate=true )
+--LogicalSubQueryAlias ( qualifier=[a] )
+--LogicalAggregate ( groupByExpr=[], outputExpr=[id#0], hasRepeat=false )
+--LogicalProject ( distinct=false, projects=[id#0], excepts=[],
canEliminate=true )
+--LogicalOlapScan ( qualified=default_cluster:test.student,
indexName=<index_not_selected>, selectedIndexId=10007, preAgg=ON )
```
## Checklist(Required)
* [ ] Does it affect the original behavior
* [x] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
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