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Efficient n_distinct #8

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hadley opened this issue Sep 6, 2016 · 2 comments

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hadley commented Sep 6, 2016

See tidyverse/dplyr#977

krlmlr mentioned this issue

n_distinct way slower than length(unique) tidyverse/dplyr#977

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hadley commented Sep 8, 2018

Now have vec_unique_count(); not always faster than length(unique()) but much faster than n_distinct().

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