r/tests/testthat/test-expression.R

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context("Expressions")

test_that("Can create an expression", {
  expect_s3_class(build_array_expression(">", Array$create(1:5), 4), "array_expression")
})

test_that("as.vector(array_expression)", {
  expect_equal(as.vector(build_array_expression(">", Array$create(1:5), 4)), c(FALSE, FALSE, FALSE, FALSE, TRUE))
})

test_that("array_expression print method", {
  expect_output(
    print(build_array_expression(">", Array$create(1:5), 4)),
    # Not ideal but it is informative
    "greater(<Array>, 4)",
    fixed = TRUE
  )
})

test_that("array_refs", {
  tab <- Table$create(a = 1:5)
  ex <- build_array_expression(">", array_expression("array_ref", field_name = "a"), 4)
  expect_s3_class(ex, "array_expression")
  expect_identical(ex$args[[1]]$args$field_name, "a")
  expect_identical(find_array_refs(ex), "a")
  out <- eval_array_expression(ex, tab)
  expect_r6_class(out, "ChunkedArray")
  expect_equal(as.vector(out), c(FALSE, FALSE, FALSE, FALSE, TRUE))
})

test_that("C++ expressions", {
  skip_if_not_available("dataset")
  f <- Expression$field_ref("f")
  expect_identical(f$field_name, "f")
  g <- Expression$field_ref("g")
  date <- Expression$scalar(as.Date("2020-01-15"))
  ts <- Expression$scalar(as.POSIXct("2020-01-17 11:11:11"))
  i64 <- Expression$scalar(bit64::as.integer64(42))
  time <- Expression$scalar(hms::hms(56, 34, 12))

  expect_r6_class(f == g, "Expression")
  expect_r6_class(f == 4, "Expression")
  expect_r6_class(f == "", "Expression")
  expect_r6_class(f == NULL, "Expression")
  expect_r6_class(f == date, "Expression")
  expect_r6_class(f == i64, "Expression")
  expect_r6_class(f == time, "Expression")
  # can't seem to make this work right now because of R Ops.method dispatch
  # expect_r6_class(f == as.Date("2020-01-15"), "Expression")
  expect_r6_class(f == ts, "Expression")
  expect_r6_class(f <= 2L, "Expression")
  expect_r6_class(f != FALSE, "Expression")
  expect_r6_class(f > 4, "Expression")
  expect_r6_class(f < 4 & f > 2, "Expression")
  expect_r6_class(f < 4 | f > 2, "Expression")
  expect_r6_class(!(f < 4), "Expression")
  expect_output(
    print(f > 4),
    'Expression\n(f > 4)',
    fixed = TRUE
  )
  # Interprets that as a list type
  expect_r6_class(f == c(1L, 2L), "Expression")
})

test_that("Can create an expression", {
  a <- Array$create(as.numeric(1:5))
  expr <- array_expression("cast", a, options = list(to_type = int32()))
  expect_s3_class(expr, "array_expression")
  expect_equal(eval_array_expression(expr), Array$create(1:5))

  b <- Array$create(0.5:4.5)
  bad_expr <- array_expression("cast", b, options = list(to_type = int32()))
  expect_s3_class(bad_expr, "array_expression")
  expect_error(
    eval_array_expression(bad_expr),
    "Invalid: Float value .* was truncated converting"
  )
  expr <- array_expression("cast", b, options = list(to_type = int32(), allow_float_truncate = TRUE))
  expect_s3_class(expr, "array_expression")
  expect_equal(eval_array_expression(expr), Array$create(0:4))
})