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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.
class TestArrayStatistics < Test::Unit::TestCase
include Helper::Buildable
def setup
omit("Parquet is required") unless defined?(::Parquet)
Tempfile.create(["data", ".parquet"]) do |file|
@file = file
array = build_int64_array([nil, -(2 ** 32), 2 ** 32])
@table = build_table("int64" => array)
writer = Parquet::ArrowFileWriter.new(@table.schema, @file.path)
chunk_size = 1024
writer.write_table(@table, chunk_size)
writer.close
reader = Parquet::ArrowFileReader.new(@file.path)
begin
@statistics = reader.read_table.get_column_data(0).get_chunk(0).statistics
yield
ensure
reader.unref
end
end
end
test("#has_null_count?") do
assert do
@statistics.has_null_count?
end
end
test("#null_count_exact?") do
assert do
@statistics.null_count_exact?
end
end
test("#null_count_exact") do
assert_equal(1, @statistics.null_count_exact)
end
test("#null_count_approximate") do
assert do
@statistics.null_count_approximate.nan?
end
end
test("#has_distinct_count?") do
assert do
not @statistics.has_distinct_count?
end
end
test("#distinct_count_exact?") do
assert do
not @statistics.distinct_count_exact?
end
end
test ("#distinct_count_exact") do
assert_equal(-1, @statistics.distinct_count_exact)
end
test ("#distinct_count_approximate") do
assert do
@statistics.distinct_count_approximate.nan?
end
end
end
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