group_by_prepare function

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,
  caller_env = caller_env(2),
  error_call = caller_env()
)

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

Returns

A list - data: Modified tbl

• groups: Modified groups