tests/testthat/_snaps/n_distinct.md

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

duckdb n_distinct() error with more than one argument

Code
  df %>% summarise(dummy = n_distinct(a, b))
Condition
  Error in `summarise()`:
  ! `n_distinct()` needs exactly one argument besides the optional `na.rm`

duckdb n_distinct() error with na.rm not being TRUE/FALSE

Code
  df %>% summarise(dummy = n_distinct(a, na.rm = "b"))
Condition
  Error in `summarise()`:
  ! Invalid value for `na.rm` in call to `n_distinct()`

duckdb n_distinct() error with mutate

Code
  df %>% mutate(dummy = n_distinct(a))
Condition
  Error in `mutate()`:
  ! `n_distinct()` not supported in window functions

duckplyr documentation built on June 8, 2025, 10:53 a.m.