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Make it possible to switch between by and keyby #85

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hadley opened this issue Jul 3, 2019 · 0 comments
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@hadley hadley commented Jul 3, 2019

From @jangorecki:

Moreover doing keyby vs by adds an overhead, thus by should be preferred as default. Difference is not anything big (AFAIR up to 15-25%), and might depend on GForce being utilised. I understand that keyby would be consistent with how dplyr orders grouping results, but many (or even most?) of dplyr backends are not maintaining any specific order of results so that shouldn't be big deal.

@hadley hadley added the feature label Jul 3, 2019
hadley referenced this issue Jul 3, 2019
* Eliminate key_by() in favour of key_by argument to lazy_dt()

* `group_by()` now uses `keyby` instead of `by` to preserve dplyr group ordering semantics.

cc @MichaelChirico
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