在lapply（list（...）,._ java_valid_object）：由强制引入的NA

Question

a[1]
[1] "AA"
> rhive.query("select count( uniquecarrier)  from f08 where uniquecarrier= '",a[1] ," ' ")
Error: java.sql.SQLException: Query returned non-zero code: 40000, cause: FAILED: ParseException line 1:61 cannot recognize input near '<EOF>' '<EOF>' '<EOF>' in expression specification
In addition: Warning messages:
1: In lapply(list(...), ._java_valid_object) : NAs introduced by coercion
2: In lapply(list(...), ._java_valid_object) : NAs introduced by coercion

我想为rhive提供值向量值，但是当我触发上面的查询时，它会显示错误。

Answer 1

您将查询作为单独的参数提供给rhive.query，这不起作用（该命令必须是first argument）。你需要先paste0他们在一起：

cmd <- paste0("select count( uniquecarrier)  from f08 where uniquecarrier= '", a[1] , "'")
cmd
# [1] "select count( uniquecarrier)  from f08 where uniquecarrier= 'AA'"

rhive.query(cmd)