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Neal RichardsonGitHub
b5b41ccfb05
Neal Richardson authored and GitHub committed 80e398623d9
ARROW-13766: [R] Add slice_*() methods (#14361)

This PR implements `slice_head,()` `slice_tail()`, `slice_min()`, `slice_max()` and `slice_sample()`. `slice_sample()` requires a clever hack using a UDF because the `random()` C++ function apparently does not work; see ARROW-17974. 

Authored-by: Neal Richardson <neal.p.richardson@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>