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rbindlist support fill=TRUE with use.names=FALSE and use it in merge.R ToDo of #678 #5263

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merged 12 commits into from
Nov 23, 2021
Merged

rbindlist support fill=TRUE with use.names=FALSE and use it in merge.R ToDo of #678 #5263

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afa4c7a
use set in merge instead of cbind
ben-schwen Nov 19, 2021
285e971
use CsubsetDT twice and remove this branch
ben-schwen Nov 19, 2021
aefc535
cutting dummy table
ben-schwen Nov 19, 2021
287eb65
revert subsetDT
ben-schwen Nov 20, 2021
9af66cb
reuse names
ben-schwen Nov 20, 2021
864c409
flip tail indexing
ben-schwen Nov 20, 2021
773b188
add test to ensure y is not altered
ben-schwen Nov 21, 2021
469f236
tidy up test
ben-schwen Nov 21, 2021
cc7846d
add more tests
ben-schwen Nov 21, 2021
cac0391
make comments clearer
ben-schwen Nov 22, 2021
8249e12
Merge branch 'master' into clear_todos_megabranch
mattdowle Nov 22, 2021
4030b94
add rbindlist support for use.names=FALSE with fill=TRUE and use that…
mattdowle Nov 23, 2021
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5 changes: 3 additions & 2 deletions R/merge.R
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Original file line number Diff line number Diff line change
Expand Up @@ -82,8 +82,9 @@ merge.data.table = function(x, y, by = NULL, by.x = NULL, by.y = NULL, all = FAL
othercolsx = setdiff(nm_x, by)
if (length(othercolsx)) {
tmp = rep.int(NA_integer_, length(missingyidx))
# TO DO: use set() here instead..
yy = cbind(yy, x[tmp, othercolsx, with = FALSE])
nx = c(names(yy), names(x[tmp, othercolsx, with = FALSE]))
nx = make.unique(nx)
set(yy, NULL, tail(nx, -ncol(yy)), x[tmp, othercolsx, with = FALSE])
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is there a noticeable memory advantage to looping over the RHS columns instead of creating the whole with=FALSE subset table?

it looks like the advantage is we can do the tmp subset once & apply it to all columns...

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I guessed that saving this tmp object and doing indexing twice is preferred over using additional memory. Rethinking it again, I might have figured out what the ToDo meant initially where using set omits this object/indexing anyway.

}
# empty data.tables (nrow =0, ncol>0) doesn't skip names anymore in new rbindlist
# takes care of #24 without having to save names. This is how it should be, IMHO.
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