Same basic philosophy as group_by_prepare(): lazy_dots comes in, list of data and vars (character vector) comes out.
Source:R/distinct.R, R/group-by.R
group_by_prepare.Rd*_prepare() performs standard manipulation that is needed prior
to actual data processing. They are only be needed by packages
that implement dplyr backends.
Usage
distinct_prepare(
.data,
vars,
group_vars = character(),
.keep_all = FALSE,
caller_env = caller_env(2),
error_call = caller_env()
)
group_by_prepare(
.data,
...,
.add = FALSE,
.dots = deprecated(),
add = deprecated(),
error_call = caller_env()
)