ef2 | IDM辅助下载工具，使用自定义ef2 : //协议，同时支持解析IDM导出文件 | Object-Relational Mapping library

Two things, as you have duplicated columns name, you could loop over unique columns name. For the problem with reindex, you can first use sum along columns (axis=1) and use level=0 to perform a groupby similar columns name.

I believe this is because of the unspecialized annotation on Function2's curried method.

The other methods that you made likely had toString overridden to say and , but since the curried method is annotated with unspecialized, it doesn't generate a new method that produces a Function1 instance with a pretty toString. They likely did this to reduce code bloat, because Function2's type parameters are all annotated with @specialized.

I don't know why you got the output scala.Function2 in your worksheet, but in Scastie, I got scala.Function2$$Lambda$8576/819881548@48c9e826, which tells us that it came from a lambda used inside Function2.

One option is match

This is not supported in core 2.1 version , it needs to be used in core 3.0 and above, see here.

For whether oracle supports the use of ef core 3.0 version, you can refer to this.

Maybe you can try this solution.

Just Add This CSS