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往vector中添加数据时命名可以是变量吗

在DolphinDB中定义了一个向量,现在往其添加数据,例子代码如下:

key="0_10"   
lines.append!(dailyPnl.data.cumsum() as key) 

代码中 as 后的key是个变量,例如表示0_10这样的值,但是测试发现as后的key被作为一个常量值“key”了,如下图所示,as后面不能跟变量吗?有没有解决方法?
image.png


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可以使用rename!函数给vector重命名:

lines.append!(dailyPnl.data.rename!(key))

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