Question

尝试连接具有integer64值列的表作为主键时，出现意外错误。以下说明了问题 -

Keys as int
-----------
x <- data.table(c1=c(1,2,3), c3=c(10,20,30))
z <- data.table(c1=c(1,2), c2=c(100,200))

setkey(x, c1)
setkey(z, c1)

> z[x]          # Join works fine

   c1  c2 c3
1:  1 100 10
2:  2 200 20
3:  3  NA 30


As integer64
------------

library(bit64)
x[,c1:=as.integer64(c1)]
z[,c1:=as.integer64(c1)]

setkey(x, c1)
setkey(z, c1)

> z[x]       # Same join, but generates error message

Error in vecseq(f__, len__, if (allow.cartesian) NULL else as.integer(max(nrow(x),  : 
Join results in 6 rows; more than 3 = max(nrow(x),nrow(i)). Check for duplicate key values 
in i, each of which join to the same group in x over and over again. If that's ok, try 
including `j` and dropping `by` (by-without-by) so that j runs for each group to avoid the 
large allocation. If you are sure you wish to proceed, rerun with allow.cartesian=TRUE. 
Otherwise, please search for this error message in the FAQ, Wiki, Stack Overflow and 
datatable-help for advice.

对问题可能是什么有任何想法？我在更大的表上得到了同样的错误。作为一种解决方法，我必须将integer64值转换为字符，之后它才能正常工作。

> sessionInfo()
R version 3.0.1 (2013-05-16)
Platform: x86_64-apple-darwin10.8.0 (64-bit)

... 
other attached packages:
[1] bit64_0.9-2       bit_1.1-10        cluster_1.14.4    skmeans_0.2-4     ggplot2_0.9.3.1  
[6] data.table_1.8.11

提前致谢。

Answer 1

回答一个悬而未决的问题。现在按照预期处理（1.9.5）您在integer64列上的连接返回与数字字段上的连接相同的结果。

使用integer64键加入Error

1 个答案: