R/dplyr-reimplement.R

In duckplyr: A 'DuckDB'-Backed Version of 'dplyr'

duckplyr_mutate_keep <- function(out, keep, used, names_new, names_groups) {
  if (keep == "all") {
    return(out)
  }

  names <- names(out)

  names_keep <- switch(keep,
    used = names(used)[used],
    unused = names(used)[!used],
    none = character(),
    abort("Unknown `keep`.", .internal = TRUE)
  )

  names_out <- intersect(names, c(names_new, names_groups, names_keep))

  select(out, !!!names_out)
}