程序包 org.meteoinfo.dataframe.impl

接口 KeyFunction<I>

类型参数:

I - the type of the input values

所有超级接口:

Function<List<I>,Object>

public interface KeyFunction<I>
extends Function<List<I>,Object>

A function that converts data frame rows to index or group keys.

Implementors define Function.apply(Object) to accept a data frame row as input and return a key value, most commonly used by DataFrame.groupBy(KeyFunction).

方法概要

从接口继承的方法 org.meteoinfo.dataframe.impl.Function

apply