kingbabingge commented on issue #18660:
URL: https://github.com/apache/doris/issues/18660#issuecomment-1558524327
concat 函数在启动FE时注册。VARCHAR 类型len =-1 ，什么会情况下会导致修改 len的值？
```java
private void registerFEFunction(ImmutableMultimap.Builder<String,
FEFunctionInvoker> mapBuilder,
Method method, FEFunction annotation) {
if (annotation != null) {
String name = annotation.name();
System.out.println(PrimitiveType.valueOf(annotation.returnType()));
Type returnType =
Type.fromPrimitiveType(PrimitiveType.valueOf(annotation.returnType()));
List<Type> argTypes = new ArrayList<>();
for (String type : annotation.argTypes()) {
argTypes.add(ScalarType.createType(type));
}
FEFunctionSignature signature = new FEFunctionSignature(name,
argTypes.toArray(new Type[argTypes.size()]), returnType);
mapBuilder.put(name, new FEFunctionInvoker(method, signature));
}
}
```
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