如何在 pgf / tikz 中对箱线图进行分组？

Question

使用 pgf / tikz 可以轻松对条形图进行分组，例如，

\begin{tikzpicture}
\begin{axis}[       
    width  = 0.85*\textwidth,
    height = 4cm,
    major x tick style = transparent,
    xbar=2*\pgflinewidth,
    bar width=6pt,
    xmajorgrids = true,
    xlabel = {Run time speed},
    symbolic y coords={A,B},
    ytick = data,
    scaled x ticks = false,
    enlarge y limits=0.2,
    xmin=0,
    legend cell align=right,
    legend style={
            at={(1,1.05)},
            anchor=south east,
            column sep=1ex
    }
]
    \addplot[style={ppurple,fill=ppurple,mark=none}]
        coordinates {(0.62103,A) (0.76326,B)};


    \addplot[style={ggreen,fill=ggreen,mark=none}]
        coordinates {(0.84163,A) (0.96132,B)};




    \legend{No vectorization,TreeScore $>2$,TreeScore $>3$,TreeScore $>4$}
\end{axis}
\end{tikzpicture}

产生如下图所示的结果：

但是，是否可以使用箱线图/晶须图代替条形图来做同样的事情？

我的起始代码是这样的：

\begin{tikzpicture}
\begin{axis}
[
width  = 0.85*\textwidth,
    height = 12cm,
    major x tick style = transparent,
    xbar=2*\pgflinewidth,
ytick={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16},
yticklabels={A,B},
]
\addplot+[style={ppurple,fill=ppurple,mark=none,fill opacity=0.2},
boxplot prepared={
  median=0.8227,
  upper quartile=0.8873,
  lower quartile=0.4659,
  upper whisker=0.9134,
  lower whisker=0.3202
},
] coordinates {};     

\addplot+[style={ggreen,fill=ggreen,mark=none,fill opacity=0.2},
boxplot prepared={
median=0.8286, upper quartile=0.94934, lower quartile=0.64128, upper whisker=0.96482,    lower      whisker=0.56093
},
] coordinates {}; 
\end{axis}
\end{tikzpicture} 

...但我不知道如何对这两个图进行分组，以便它们都属于组 A。使用符号 y 坐标似乎不起作用。