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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.
*/
package org.apache.spark.util.collection.unsafe.sort
import com.google.common.primitives.UnsignedBytes
import org.scalatest.prop.PropertyChecks
import org.apache.spark.SparkFunSuite
import org.apache.spark.unsafe.types.UTF8String
class PrefixComparatorsSuite extends SparkFunSuite with PropertyChecks {
test("String prefix comparator") {
def testPrefixComparison(s1: String, s2: String): Unit = {
val utf8string1 = UTF8String.fromString(s1)
val utf8string2 = UTF8String.fromString(s2)
val s1Prefix = PrefixComparators.STRING.computePrefix(utf8string1)
val s2Prefix = PrefixComparators.STRING.computePrefix(utf8string2)
val prefixComparisonResult = PrefixComparators.STRING.compare(s1Prefix, s2Prefix)
val cmp = UnsignedBytes.lexicographicalComparator().compare(
utf8string1.getBytes.take(8), utf8string2.getBytes.take(8))
assert(
(prefixComparisonResult == 0 && cmp == 0) ||
(prefixComparisonResult < 0 && s1.compareTo(s2) < 0) ||
(prefixComparisonResult > 0 && s1.compareTo(s2) > 0))
}
// scalastyle:off
val regressionTests = Table(
("s1", "s2"),
("abc", "世界"),
("你好", "世界"),
("你好123", "你好122")
)
// scalastyle:on
forAll (regressionTests) { (s1: String, s2: String) => testPrefixComparison(s1, s2) }
forAll { (s1: String, s2: String) => testPrefixComparison(s1, s2) }
}
test("double prefix comparator handles NaNs properly") {
val nan1: Double = java.lang.Double.longBitsToDouble(0x7ff0000000000001L)
val nan2: Double = java.lang.Double.longBitsToDouble(0x7fffffffffffffffL)
assert(nan1.isNaN)
assert(nan2.isNaN)
val nan1Prefix = PrefixComparators.DOUBLE.computePrefix(nan1)
val nan2Prefix = PrefixComparators.DOUBLE.computePrefix(nan2)
assert(nan1Prefix === nan2Prefix)
val doubleMaxPrefix = PrefixComparators.DOUBLE.computePrefix(Double.MaxValue)
assert(PrefixComparators.DOUBLE.compare(nan1Prefix, doubleMaxPrefix) === 1)
}
}
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