如何在facet中同时使用`group_by()`和`ggplot_build()`？

library(ggplot2)
library(dplyr)

df <- data.frame(x = c(1, 2, 3, 4, 5),
                 y = c(2, 4, 6, 8, 10),
                 group_var = c("A", "A", "B", "B", "B"))
df <- df %>% group_by(group_var)

p <- ggplot(df, aes(x, y)) + geom_point()
plot_data <- ggplot_build(p)

p <- p + facet_wrap(~ group_var)

library(ggplot2)
library(dplyr)

df <- data.frame(x = c(1, 2, 3, 4, 5),
                 y = c(2, 4, 6, 8, 10),
                 group_var = c("A", "A", "B", "B", "B"))
df <- df %>% group_by(group_var)

p <- ggplot(df, aes(x, y)) + geom_point()
plot_data <- ggplot_build(p)

p <- p + facet_wrap(~ group_var)

print(p)