Speedup of unique.data.table#2474

Merged

mattdowle merged 8 commits intomasterfrom

Jan 12, 2018

Commits on Oct 19, 2017

Initial assay of #2013 -- free speedup of unique.data.table
MichaelChirico
committed

Commits on Nov 10, 2017

Merge branch 'master' into unique_speedup
mattdowle
committed

Commits on Nov 14, 2017

unique.data.table reworked to call forderv directly to avoid temporary logical vector length nrow. Fails two tests but pushing to PR to park it and switch to another PR.
mattdowle
committed

Commits on Jan 11, 2018

Merge branch 'master' into unique_speedup
mattdowle
committed