:= changes address of a data table #1729
Description
I have narrowed down this to a specific dataset which I attach. It happens only when loaded from rds. If I read same data with fread the problem does not occur.
I am disguising rds file with txt extension in order to be able to upload it to github.
address_change <- function(df){
cat("address before:", address(df), "\n")
df[, c("new_var") := 1]
cat("address after:", address(df), "\n")
}
tt <- readRDS("tt.txt")
address_change(tt)
"new_var" %in% names(tt)I see consistent change of address on every trial:
> address_change(tt)
address before: 0x8aacf60
address after: 0xbd35150
> "new_var" %in% names(tt)
[1] FALSE
Any ideas of how to get around this without a copy?
devtools::session_info("data.table")
Session info ---------------------------------------------------------------------------------------------------------
setting value
version R version 3.2.4 RC (2016-03-02 r70278)
system x86_64, linux-gnu
ui X11
language
collate C
tz Europe/Amsterdam
date 2016-06-05
Packages -------------------------------------------------------------------------------------------------------------
package * version date source
data.table * 1.9.7 2016-06-01 Github (Rdatatable/data.table@6c12e25)