我有一个数据集要使用key-dataset更新。我想将数据集中的条目（group_1：group_3）更改为相应的值。
请注意，在现实中，我的关键数据集有+25k个条目，寻找一个有效的解决方案是我在这里的原因！感谢所有帮助。
玩具示例

df <- data.frame(state=rep("state_a"),
             candidate=c("a","b","c"),
             group_1= c("g_1","g_2","g_3"),
             group_2= c("g_4","g_5",NA),
             group_3= c("g_5",NA,NA))

key <- data.frame(group=c("g_1","g_2","g_3","g_4","g_5"),
              leader=c("l_1","l_2","l_3","l_4","l_4"))

结果：

df <- data.frame(state=rep("state_a"),
             candidate=c("a","b","c"),
             group_1= c("g_1","g_2","g_3"),
             group_2= c("g_4","g_5",NA),
             group_3= c("g_5",NA,NA))

其他要求：我想使用df_2（与df相同的维度）来决定哪些条目要保留df_final，然后进行转换。

df_2 <- data.frame(state=rep("state_a"),
                   candidate=c("a","b","c"),
                   value_1= c("1","2","0"),
                   value_2= c("3","2",NA),
                   value_3= c("5",NA,NA))

df_final_temp <- data.frame(state=rep("state_a"),
             candidate=c("a","b","c"),
             group_1= c("g_1","g_2",NA),
             group_2= c("g_4","g_5",NA),
             group_3= c("g_5",NA,NA))

df_final <- data.frame(state=rep("state_a"),
             candidate=c("a","b","c"),
             group_1= c("l_1","l_2",NA),
             group_2= c("l_4","l_5",NA),
             group_3= c("l_5",NA,NA))