CookingBoy commented on issue #18660:
URL: https://github.com/apache/doris/issues/18660#issuecomment-1825304268
> concat 函数在启动FE时注册。VARCHAR 类型len =-1 ，什么情况下会导致修改 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));
> }
> }
> ```
>
> 猜测，metabase连接doris后一些初始化脚本，导致doris 的concat 函数的 FEFunctionInvoker中
VARCHAR参数变成了 100.
>
> 什么情况下才会修改这个信息呢？
请问您解决这个问题了么
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