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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
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$scalar(hms::hms(56, 34, 12))
expect_r6_class(f == g, "Expression")
expect_r6_class(f == 4, "Expression")
expect_r6_class(f == "", "Expression")
expect_r6_class(f == NULL, "Expression")
expect_r6_class(f == date, "Expression")
expect_r6_class(f == i64, "Expression")
expect_r6_class(f == time, "Expression")
# can't seem to make this work right now because of R Ops.method dispatch
# expect_r6_class(f == as.Date("2020-01-15"), "Expression") # nolint
expect_r6_class(f == ts, "Expression")
expect_r6_class(f <= 2L, "Expression")
expect_r6_class(f != FALSE, "Expression")
expect_r6_class(f > 4, "Expression")
expect_r6_class(f < 4 & f > 2, "Expression")
expect_r6_class(f < 4 | f > 2, "Expression")
expect_r6_class(!(f < 4), "Expression")
expect_output(
print(f > 4),
"Expression\n(f > 4)",
fixed = TRUE
)
expect_equal(
f$type(schema(f = float64())),
float64()
)
expect_equal(
(f > 4)$type(schema(f = float64())),
bool()
)
# Interprets that as a list type
expect_r6_class(f == c(1L, 2L), "Expression")
# Non-Expression inputs are wrapped in Expression$scalar()
expect_equal(
Expression$create("add", 1, 2),
Expression$create("add", Expression$scalar(1), Expression$scalar(2))
)
})
test_that("Field reference expression schemas and types", {
x <- Expression$field_ref("x")
# type() throws error when schema is NULL
expect_error(x$type(), "schema")
# type() returns type when schema is set
x$schema <- Schema$create(x = int32())
expect_equal(x$type(), int32())
})
test_that("Nested field refs", {
x <- Expression$field_ref("x")
nested <- x$y
expect_r6_class(nested, "Expression")
expect_r6_class(x[["y"]], "Expression")
expect_r6_class(nested$z, "Expression")
expect_error(Expression$scalar(42L)$y, "Cannot extract a field from an Expression of type int32")
})
test_that("Scalar expression schemas and types", {
# type() works on scalars without setting the schema
expect_equal(
Expression$scalar("foo")$type(),
arrow::string()
)
expect_equal(
Expression$scalar(42L)$type(),
int32()
)
})
test_that("Expression schemas and types", {
x <- Expression$field_ref("x")
y <- Expression$field_ref("y")
z <- Expression$scalar(42L)
# type() throws error when both schemas are unset
expect_error(
Expression$create("add_checked", x, y)$type(),
"schema"
)
# type() throws error when left schema is unset
y$schema <- Schema$create(y = float64())
expect_error(
Expression$create("add_checked", x, y)$type(),
"schema"
)
# type() throws error when right schema is unset
x$schema <- Schema$create(x = int32())
y$schema <- NULL
expect_error(
Expression$create("add_checked", x, y)$type(),
"schema"
)
# type() returns type when both schemas are set
y$schema <- Schema$create(y = float64())
expect_equal(
Expression$create("add_checked", x, y)$type(),
float64()
)
# type() returns type when one arg has schema set and one is scalar
expect_equal(
Expression$create("add_checked", x, z)$type(),
int32()
)
})
test_that("Nested field ref types", {
nested <- Expression$field_ref("x")$y
schm <- schema(x = struct(y = int32(), z = double()))
expect_equal(nested$type(schm), int32())
# implicit casting and schema propagation
x <- Expression$field_ref("x")
x$schema <- schm
expect_equal((x$y * 2)$type(), int32())
})
test_that("Nested field from a non-field-ref (struct_field kernel)", {
x <- Expression$scalar(tibble::tibble(a = 1, b = "two"))
expect_true(inherits(x$a, "Expression"))
expect_equal(x$a$type(), float64())
expect_error(x$c, "field 'c' not found in struct<a: double, b: string>")
})
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