unwanted memory "sharing" with names() on a data.table

[vsalmendra]

It seems that the variable created by using names() on a data.table keeps pointing to the data.table internal data, so when one renames a field, the variable which holds the names() results also changes. I suspect this is behind other crashes with data.table I have been experiencing

> x = data.table(a=c(1,2), b=c(2,3))
> n = names(x)
> setnames(x, "a","z")
> x
   z b
1: 1 2
2: 2 3
> n
[1] "z" "b"

Version info:

data.table v 1.9.2
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 3
minor 1.0
year 2014
month 04
day 10
svn rev 65387
language R
version.string R version 3.1.0 (2014-04-10)
nickname Spring Dance

[jangorecki]

Just to let you know you should report an issue after checking it on current dev 1.9.3. It may have been fixed already, 1.9.2 is quite old already. Cheers

[arunsrinivasan]

Thanks. We're aware of this - duplicate of #512. You should use copy().
I'd be interested to know more about the other crashes you're experiencing.

[vsalmendra]

Error in if (!all(names(sys.call()) %in% c("", "exact")))
warning("named arguments other than 'exact' are discouraged") :
missing value where TRUE/FALSE neededError during wrapup: missing
value where TRUE/FALSE neededError in if (!is.null(ns)) ns else
tryCatch(loadNamespace(name), error = function(e) stop(e)) :
missing value where TRUE/FALSE needed

2014-08-21 18:09 GMT+03:00 arunsrinivasan notifications@github.com:

Thanks. We're aware of this - duplicate of #512
#512. You should use
copy().
I'd be interested to know more about the other crashes you're
experiencing.

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