924060929 opened a new pull request, #12481:
URL: https://github.com/apache/doris/pull/12481
# Proposed changes
Support function registry.
The classes:
- FunctionRegistry: used to register scalar functions and aggregate functions
- FunctionBuilder: used to resolve a BoundFunction, extract the constructor,
and build to a BoundFunction by arguments(`List<Expression>`)
Register example:
```java
public class FunctionRegistry {
public static final List<ScalarFunc> SCALAR_FUNCTIONS = ImmutableList.of(
scalar(Substring.class, "substr", "substring"),
scalar(WeekOfYear.class),
scalar(Year.class)
);
public static final ImmutableList<AggregateFunc> AGGREGATE_FUNCTIONS =
ImmutableList.of(
agg(Avg.class),
agg(Count.class),
agg(Max.class),
agg(Min.class),
agg(Sum.class)
);
}
```
Note:
- Currently, we only support register scalar functions add aggregate
functions, we will support register table functions.
- Currently, we only support resolve function by function name and
difference arity, but can not resolve the same arity override function, e.g.
`some_function(Expression)` and `some_function(Literal)`
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [x] No
- [ ] I don't know
2. Has unit tests been added:
- [x] Yes
- [ ] No
- [ ] No Need
3. Has document been added or modified:
- [ ] Yes
- [ ] No
- [x] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [x] No
5. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [x] No
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