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implement sample_n and sample_frac #2

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piccolbo opened this issue May 21, 2015 · 0 comments
Open

implement sample_n and sample_frac #2

piccolbo opened this issue May 21, 2015 · 0 comments
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sql limitation

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@piccolbo
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as hadley refused tidyverse/dplyr#592

n = 
sample_n
 select * from tbl order by rand() limit n
bernoulli (approximation for sample_frac)
select * from tbl where rand() < frac

Obviously we can only do it for the sparkSQL source
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@piccolbo