我们可以使用as.is和向量吗？

Question

我有一个字符向量说

"a","b","c","d","e"

矢量的输出是

as.is

data.frame指令选择我们将任何列作为纯文本阅读。这适用于select X, Y, Z, Period, Amount as TopAmount from (select X, Y, Z, Period, cast(StrAmt as double) as Amount, row_number() over (partition by Period order by cast(StrAmt as double) desc) as TmpRank from WTF ) TMPWTF where TmpRank =1 。我可以使用as.is作为矢量吗？