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137 lines (117 loc) · 4.68 KB
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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.arrow.algorithm.sort;
import static org.junit.Assert.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.apache.arrow.memory.BufferAllocator;
import org.apache.arrow.memory.RootAllocator;
import org.apache.arrow.vector.VarCharVector;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test cases for {@link StableVectorComparator}.
*/
public class TestStableVectorComparator {
private BufferAllocator allocator;
@Before
public void prepare() {
allocator = new RootAllocator(1024 * 1024);
}
@After
public void shutdown() {
allocator.close();
}
@Test
public void testCompare() {
try (VarCharVector vec = new VarCharVector("", allocator)) {
vec.allocateNew(100, 5);
vec.setValueCount(10);
// fill data to sort
vec.set(0, "ba".getBytes());
vec.set(1, "abc".getBytes());
vec.set(2, "aa".getBytes());
vec.set(3, "abc".getBytes());
vec.set(4, "a".getBytes());
VectorValueComparator<VarCharVector> comparator = new TestVarCharSorter();
VectorValueComparator<VarCharVector> stableComparator = new StableVectorComparator<>(comparator);
stableComparator.attachVector(vec);
assertTrue(stableComparator.compare(0, 1) > 0);
assertTrue(stableComparator.compare(1, 2) < 0);
assertTrue(stableComparator.compare(2, 3) < 0);
assertTrue(stableComparator.compare(1, 3) < 0);
assertTrue(stableComparator.compare(3, 1) > 0);
assertTrue(stableComparator.compare(3, 3) == 0);
}
}
@Test
public void testStableSortString() {
try (VarCharVector vec = new VarCharVector("", allocator)) {
vec.allocateNew(100, 10);
vec.setValueCount(10);
// fill data to sort
vec.set(0, "a".getBytes());
vec.set(1, "abc".getBytes());
vec.set(2, "aa".getBytes());
vec.set(3, "a1".getBytes());
vec.set(4, "abcdefg".getBytes());
vec.set(5, "accc".getBytes());
vec.set(6, "afds".getBytes());
vec.set(7, "0".getBytes());
vec.set(8, "01".getBytes());
vec.set(9, "0c".getBytes());
// sort the vector
VariableWidthOutOfPlaceVectorSorter sorter = new VariableWidthOutOfPlaceVectorSorter();
VectorValueComparator<VarCharVector> comparator = new TestVarCharSorter();
VectorValueComparator<VarCharVector> stableComparator = new StableVectorComparator<>(comparator);
try (VarCharVector sortedVec =
(VarCharVector) vec.getField().getFieldType().createNewSingleVector("", allocator, null)) {
sortedVec.allocateNew(vec.getByteCapacity(), vec.getValueCount());
sortedVec.setLastSet(vec.getValueCount() - 1);
sortedVec.setValueCount(vec.getValueCount());
sorter.sortOutOfPlace(vec, sortedVec, stableComparator);
// verify results
// the results are stable
assertEquals("0", new String(sortedVec.get(0)));
assertEquals("01", new String(sortedVec.get(1)));
assertEquals("0c", new String(sortedVec.get(2)));
assertEquals("a", new String(sortedVec.get(3)));
assertEquals("abc", new String(sortedVec.get(4)));
assertEquals("aa", new String(sortedVec.get(5)));
assertEquals("a1", new String(sortedVec.get(6)));
assertEquals("abcdefg", new String(sortedVec.get(7)));
assertEquals("accc", new String(sortedVec.get(8)));
assertEquals("afds", new String(sortedVec.get(9)));
}
}
}
/**
* Utility comparator that compares varchars by the first character.
*/
private static class TestVarCharSorter extends VectorValueComparator<VarCharVector> {
@Override
public int compareNotNull(int index1, int index2) {
byte b1 = vector1.get(index1)[0];
byte b2 = vector2.get(index2)[0];
return b1 - b2;
}
@Override
public VectorValueComparator<VarCharVector> createNew() {
return new TestVarCharSorter();
}
}
}