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[R-Forge #5607] can not add new columns when the data.table is loaded from saved environment. #479

arunsrinivasan opened this Issue Jun 8, 2014 · 0 comments


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arunsrinivasan commented Jun 8, 2014

Submitted by: Chong Wang; Assigned to: Nobody; R-Forge link

when the data.table DT is saved to an environment and then reloaded, adding new columns doesn't have effect on the data.table. (see data.table B)

env <- new.env(parent = emptyenv())
DT <- data.table(x = 1:3)
assign("DT", DT, envir=env)
env$DT[, y := 3]
A <- copy(env$DT)

save(env, file="temp.rda")   
rm (DT)
rm (env)


env$DT[, z:=10]
B <- copy(env$DT)

env$DT <- copy(env$DT)
env$DT[, z:=10]
C <- copy(env$DT)

Now, looking at the data.tables A, B and C:

#    x y
#1: 1 3
#2: 2 3
#    x y
#1: 1 3
#2: 2 3
#    x y  z
#1: 1 3 10
#2: 2 3 10

In principal, B should have the same content as C.


@arunsrinivasan arunsrinivasan added this to the v1.9.6 milestone Sep 24, 2014

@arunsrinivasan arunsrinivasan modified the milestones: v1.9.6, v1.9.8 Oct 10, 2014

@arunsrinivasan arunsrinivasan modified the milestones: v1.9.6, v1.9.8 Jan 28, 2015

@arunsrinivasan arunsrinivasan self-assigned this Jan 28, 2015

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