Same basic philosophy as group_by_prepare(): lazy_dots comes in, list of data and vars (character vector) comes out.

*_prepare() performs standard manipulation that is needed prior to actual data processing. They are only be needed by packages that implement dplyr backends.

distinct_prepare(.data, vars, group_vars = character(), .keep_all = FALSE)

group_by_prepare(
  .data,
  ...,
  .add = FALSE,
  .dots = deprecated(),
  add = deprecated()
)

Value

A list

data

Modified tbl

groups

Modified groups