tests/testthat/test-infer-ptype.R

In nanoarrow: Interface to the 'nanoarrow' 'C' Library

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test_that("infer_nanoarrow_ptype() works on arrays, schemas, and streams", {
  array <- as_nanoarrow_array(logical())
  expect_identical(infer_nanoarrow_ptype(array), logical())

  schema <- infer_nanoarrow_schema(array)
  expect_identical(infer_nanoarrow_ptype(schema), logical())

  stream <- as_nanoarrow_array_stream(data.frame(x = logical()))
  expect_identical(infer_nanoarrow_ptype(stream), data.frame(x = logical()))

  expect_error(
    infer_nanoarrow_ptype("not valid"),
    "must be a nanoarrow_schema"
  )
})

test_that("infer_nanoarrow_ptype() works for basic types", {
  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_array(vctrs::unspecified())),
    vctrs::unspecified()
  )

  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_array(logical())),
    logical()
  )

  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_array(integer())),
    integer()
  )

  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_array(double())),
    double()
  )

  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_schema(na_decimal128(2, 3))),
    double()
  )

  expect_identical(
    infer_nanoarrow_ptype(as_nanoarrow_array(character())),
    character()
  )

  expect_identical(
    infer_nanoarrow_ptype(
      as_nanoarrow_array(data.frame(x = character(), stringsAsFactors = FALSE))
    ),
    data.frame(x = character(), stringsAsFactors = FALSE)
  )
})

test_that("infer_nanoarrow_ptype() infers ptypes for date/time types", {
  array_date <- as_nanoarrow_array(as.Date("2000-01-01"))
  expect_identical(
    infer_nanoarrow_ptype(array_date),
    as.Date(character())
  )

  array_time <- as_nanoarrow_array(hms::parse_hm("12:34"))
  expect_identical(
    infer_nanoarrow_ptype(array_time),
    hms::hms()
  )

  array_duration <- as_nanoarrow_array(as.difftime(123, units = "secs"))
  expect_identical(
    infer_nanoarrow_ptype(array_duration),
    as.difftime(numeric(), units = "secs")
  )

  array_timestamp <- as_nanoarrow_array(
    as.POSIXct("2000-01-01 12:33", tz = "America/Halifax")
  )
  expect_identical(
    infer_nanoarrow_ptype(array_timestamp),
    as.POSIXct(character(), tz = "America/Halifax")
  )
})

test_that("infer_nanoarrow_ptype() infers ptypes for nested types", {
  skip_if_not_installed("arrow")

  array_list <- as_nanoarrow_array(vctrs::list_of(integer()))
  expect_identical(
    infer_nanoarrow_ptype(array_list),
    vctrs::list_of(.ptype = integer())
  )

  array_fixed_size <- as_nanoarrow_array(
    arrow::Array$create(
      list(1:5),
      arrow::fixed_size_list_of(arrow::int32(), 5)
    )
  )
  expect_identical(
    infer_nanoarrow_ptype(array_fixed_size),
    vctrs::list_of(.ptype = integer())
  )
})

test_that("infer_nanoarrow_ptype() errors for types it can't infer",  {
  unsupported_array <- nanoarrow_array_init(na_decimal256(3, 4))
  expect_error(
    infer_nanoarrow_ptype(as_nanoarrow_array(unsupported_array)),
    "Can't infer R vector type for <decimal256\\(3, 4\\)>"
  )

  unsupported_struct <- nanoarrow_array_init(
    na_struct(list(col = na_decimal256(3, 4)))
  )
  expect_error(
    infer_nanoarrow_ptype(as_nanoarrow_array(unsupported_struct)),
    "Can't infer R vector type for `col` <decimal256\\(3, 4\\)>"
  )
})