请问用R语言ggplot2绘制柱状图如何紧贴x轴，与y轴有一定距离？

ggplot(data = dataplot, mapping = aes(x=group,y=dataplot,fill=group),main = "test") + geom_bar(stat = "identity",width = 0.5) + labs(x="groups",y="number") + geom_errorbar(aes(ymin = dataplot-datastd,ymax = dataplot+datastd,width = 0.2)) + theme(panel.grid.major = element_blank(), panel.grid.minor = element_blank(), panel.background = element_blank(), axis.line = element_line(colour = "black", size = 0.6))
按这样写法绘制出是四个柱子两边都不贴

如果加一句coord_cartesian(ylim = c(0,25),expand = TRUE)
就两边都贴边了

请问如何做到只紧贴x轴，但最左边的柱子离y轴有一定距离呢？

+scale_y_continuous(expand = c(0,0))+
scale_x_continuous(expand = c(0,0))

怎么解决的呀