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Setting key to an existing index can skip forder step #2889

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MichaelChirico opened this issue May 18, 2018 · 0 comments · Fixed by #3582
Closed

Setting key to an existing index can skip forder step #2889

MichaelChirico opened this issue May 18, 2018 · 0 comments · Fixed by #3582
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@MichaelChirico
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@MichaelChirico MichaelChirico commented May 18, 2018

Consider

DT = data.table(
  ID1 = rep(10:1, 10:1),
  ID2 = rep(1:10, 1:10)
)
setindex(DT, ID1, verbose = TRUE)
# forder took 0 sec
setkey(DT, ID1, verbose = TRUE)
# forder took 0 sec
# reorder took 0 sec

I believe the second forder is superfluous -- only the physical reordering is necessary in the setkey.

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