tests/testthat/test-dplyr-distinct.R

In arrow: Integration to 'Apache' 'Arrow'

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#
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library(dplyr, warn.conflicts = FALSE)

skip_if_not_available("acero")

tbl <- example_data
tbl$some_grouping <- rep(c(1, 2), 5)

test_that("distinct()", {
  compare_dplyr_binding(
    .input %>%
      distinct(some_grouping, lgl) %>%
      arrange(some_grouping, lgl) %>%
      collect(),
    tbl
  )
})

test_that("distinct() works without any variables", {
  compare_dplyr_binding(
    .input %>%
      distinct() %>%
      arrange(int) %>%
      collect(),
    tbl
  )

  compare_dplyr_binding(
    .input %>%
      group_by(x = int + 1) %>%
      distinct() %>%
      # Even though we have group_by(x), all cols (including int) are kept
      arrange(int) %>%
      collect(),
    tbl
  )
})

test_that("distinct() can retain groups", {
  compare_dplyr_binding(
    .input %>%
      group_by(some_grouping, int) %>%
      distinct(lgl) %>%
      arrange(lgl, int) %>%
      collect(),
    tbl
  )

  # With expressions here
  compare_dplyr_binding(
    .input %>%
      group_by(y = some_grouping, int) %>%
      distinct(x = lgl) %>%
      arrange(int) %>%
      collect(),
    tbl
  )
})

test_that("distinct() can contain expressions", {
  compare_dplyr_binding(
    .input %>%
      distinct(lgl, x = some_grouping + 1) %>%
      collect() %>%
      arrange(lgl, x),
    tbl
  )

  compare_dplyr_binding(
    .input %>%
      group_by(lgl, int) %>%
      distinct(x = some_grouping + 1) %>%
      arrange(int) %>%
      collect(),
    tbl
  )
})

test_that("across() works in distinct()", {
  compare_dplyr_binding(
    .input %>%
      distinct(across(starts_with("d"))) %>%
      collect() %>%
      arrange(dbl, dbl2),
    tbl
  )
})

test_that("distinct() can return all columns", {
  # hash_one prefers to keep non-null values, which is different from .keep_all in dplyr
  # so we can't compare the result directly
  expected <- tbl %>%
    # Drop factor because of #44661:
    # NotImplemented: Function 'hash_one' has no kernel matching input types
    #   (dictionary<values=string, indices=int8, ordered=0>, uint8)
    select(-fct) %>%
    distinct(lgl, .keep_all = TRUE) %>%
    arrange(int)

  with_table <- tbl %>%
    arrow_table() %>%
    select(-fct) %>%
    distinct(lgl, .keep_all = TRUE) %>%
    arrange(int) %>%
    collect()

  expect_identical(dim(with_table), dim(expected))
  expect_identical(names(with_table), names(expected))

  # Test with some mutation in there
  expected <- tbl %>%
    select(-fct) %>%
    distinct(lgl, bigger = int * 10L, .keep_all = TRUE) %>%
    arrange(int)

  with_table <- tbl %>%
    arrow_table() %>%
    select(-fct) %>%
    distinct(lgl, bigger = int * 10, .keep_all = TRUE) %>%
    arrange(int) %>%
    collect()

  expect_identical(dim(with_table), dim(expected))
  expect_identical(names(with_table), names(expected))
  expect_identical(with_table$bigger, expected$bigger)

  # Mutation that overwrites
  expected <- tbl %>%
    select(-fct) %>%
    distinct(lgl, int = int * 10L, .keep_all = TRUE) %>%
    arrange(int)

  with_table <- tbl %>%
    arrow_table() %>%
    select(-fct) %>%
    distinct(lgl, int = int * 10, .keep_all = TRUE) %>%
    arrange(int) %>%
    collect()

  expect_identical(dim(with_table), dim(expected))
  expect_identical(names(with_table), names(expected))
  expect_identical(with_table$int, expected$int)
})