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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("Alternate type names are supported", {
expect_equal(
schema(b = double(), c = bool(), d = string(), e = float(), f = halffloat()),
schema(b = float64(), c = boolean(), d = utf8(), e = float32(), f = float16())
)
expect_equal(names(schema(b = double(), c = bool(), d = string())), c("b", "c", "d"))
})
test_that("Schema print method", {
expect_output(
print(schema(b = double(), c = bool(), d = string())),
paste(
"Schema",
"b: double",
"c: bool",
"d: string",
sep = "\n"
),
fixed = TRUE
)
})
test_that("Schema with non-nullable fields", {
expect_output(
print(schema(field("b", double()),
field("c", bool(), nullable = FALSE),
field("d", string()))),
paste(
"Schema",
"b: double",
"c: bool not null",
"d: string",
sep = "\n"
),
fixed = TRUE
)
})
test_that("Schema $GetFieldByName", {
schm <- schema(b = double(), c = string())
expect_equal(schm$GetFieldByName("b"), field("b", double()))
expect_null(schm$GetFieldByName("f"))
# TODO: schema(b = double(), b = string())$GetFieldByName("b") # nolint
# also returns NULL and probably should error bc duplicated names
})
test_that("Schema extract (returns Field)", {
# TODO: should this return a Field or the Type?
# I think of Schema like list(name = type, name = type, ...)
# but in practice it is more like list(list(name, type), list(name, type), ...)
# -> Field names in a Schema may be duplicated
# -> Fields may have metadata (though we don't really handle that in R)
schm <- schema(b = double(), c = string())
expect_equal(schm$b, field("b", double()))
expect_equal(schm[["b"]], field("b", double()))
expect_equal(schm[[1]], field("b", double()))
expect_null(schm[["ZZZ"]])
expect_error(schm[[42]]) # Should have better error message
})
test_that("Schema slicing", {
schm <- schema(b = double(), c = string(), d = int8())
expect_equal(schm[2:3], schema(c = string(), d = int8()))
expect_equal(schm[-1], schema(c = string(), d = int8()))
expect_equal(schm[c("d", "c")], schema(d = int8(), c = string()))
expect_equal(schm[c(FALSE, TRUE, TRUE)], schema(c = string(), d = int8()))
expect_error(schm[c("c", "ZZZ")], 'Invalid field name: "ZZZ"')
expect_error(schm[c("XXX", "c", "ZZZ")], 'Invalid field names: "XXX" and "ZZZ"')
})
test_that("Schema modification", {
schm <- schema(b = double(), c = string(), d = int8())
schm$c <- boolean()
expect_equal(schm, schema(b = double(), c = boolean(), d = int8()))
schm[["d"]] <- int16()
expect_equal(schm, schema(b = double(), c = boolean(), d = int16()))
schm$b <- NULL
expect_equal(schm, schema(c = boolean(), d = int16()))
# NULL assigning something that doesn't exist doesn't modify
schm$zzzz <- NULL
expect_equal(schm, schema(c = boolean(), d = int16()))
# Adding a field
schm$fff <- int32()
expect_equal(schm, schema(c = boolean(), d = int16(), fff = int32()))
# By index
schm <- schema(b = double(), c = string(), d = int8())
schm[[2]] <- int32()
expect_equal(schm, schema(b = double(), c = int32(), d = int8()))
# Adding actual Fields
# If assigning by name, note that this can modify the resulting name
schm <- schema(b = double(), c = string(), d = int8())
schm$c <- field("x", int32())
expect_equal(schm, schema(b = double(), x = int32(), d = int8()))
schm[[2]] <- field("y", int64())
expect_equal(schm, schema(b = double(), y = int64(), d = int8()))
# Error handling
expect_error(schm$c <- 4, "value must be a DataType")
expect_error(schm[[-3]] <- int32(), "i not greater than 0")
expect_error(schm[[0]] <- int32(), "i not greater than 0")
expect_error(schm[[NA_integer_]] <- int32(), "!is.na(i) is not TRUE", fixed = TRUE)
expect_error(schm[[TRUE]] <- int32(), "i is not a numeric or integer vector")
expect_error(schm[[c(2, 4)]] <- int32(), "length(i) not equal to 1", fixed = TRUE)
})
test_that("Metadata is preserved when modifying Schema", {
schm <- schema(b = double(), c = string(), d = int8())
schm$metadata$foo <- "bar"
expect_identical(schm$metadata, list(foo = "bar"))
schm$c <- field("x", int32())
expect_identical(schm$metadata, list(foo = "bar"))
})
test_that("reading schema from Buffer", {
# TODO: this uses the streaming format, i.e. from RecordBatchStreamWriter
# maybe there is an easier way to serialize a schema
batch <- record_batch(x = 1:10)
expect_r6_class(batch, "RecordBatch")
stream <- BufferOutputStream$create()
writer <- RecordBatchStreamWriter$create(stream, batch$schema)
expect_r6_class(writer, "RecordBatchWriter")
writer$close()
buffer <- stream$finish()
expect_r6_class(buffer, "Buffer")
reader <- MessageReader$create(buffer)
expect_r6_class(reader, "MessageReader")
message <- reader$ReadNextMessage()
expect_r6_class(message, "Message")
expect_equal(message$type, MessageType$SCHEMA)
stream <- BufferReader$create(buffer)
expect_r6_class(stream, "BufferReader")
message <- read_message(stream)
expect_r6_class(message, "Message")
expect_equal(message$type, MessageType$SCHEMA)
})
test_that("Input validation when creating a table with a schema", {
expect_error(
Table$create(b = 1, schema = c(b = float64())), # list not Schema
"`schema` must be an arrow::Schema or NULL"
)
})
test_that("Schema$Equals", {
a <- schema(b = double(), c = bool())
b <- a$WithMetadata(list(some = "metadata"))
# different metadata
expect_failure(expect_equal(a, b))
expect_false(a$Equals(b, check_metadata = TRUE))
# Metadata not checked
expect_equal(a, b, ignore_attr = TRUE)
# Non-schema object
expect_false(a$Equals(42))
})
test_that("unify_schemas", {
a <- schema(b = double(), c = bool())
z <- schema(b = double(), k = utf8())
expect_equal(
unify_schemas(a, z),
schema(b = double(), c = bool(), k = utf8())
)
# returns NULL when any arg is NULL
expect_null(
unify_schemas(a, NULL, z)
)
# returns NULL when all args are NULL
expect_null(
unify_schemas(NULL, NULL)
)
# errors when no args
expect_error(
unify_schemas(),
"Must provide at least one schema to unify"
)
})
test_that("Schema to C-interface", {
schema <- schema(b = double(), c = bool())
# export the schema via the C-interface
ptr <- allocate_arrow_schema()
schema$export_to_c(ptr)
# then import it and check that the roundtripped value is the same
circle <- Schema$import_from_c(ptr)
expect_equal(circle, schema)
# must clean up the pointer or we leak
delete_arrow_schema(ptr)
})
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