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Copy pathTestPartialSumUtils.java
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138 lines (113 loc) · 4.43 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.misc;
import static org.junit.Assert.assertEquals;
import org.apache.arrow.memory.BufferAllocator;
import org.apache.arrow.memory.RootAllocator;
import org.apache.arrow.vector.IntVector;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
/**
* Test cases for {@link PartialSumUtils}.
*/
public class TestPartialSumUtils {
private static final int PARTIAL_SUM_VECTOR_LENGTH = 101;
private static final int DELTA_VECTOR_LENGTH = 100;
private BufferAllocator allocator;
@Before
public void prepare() {
allocator = new RootAllocator(1024 * 1024);
}
@After
public void shutdown() {
allocator.close();
}
@Test
public void testToPartialSumVector() {
try (IntVector delta = new IntVector("delta", allocator);
IntVector partialSum = new IntVector("partial sum", allocator)) {
delta.allocateNew(DELTA_VECTOR_LENGTH);
delta.setValueCount(DELTA_VECTOR_LENGTH);
partialSum.allocateNew(PARTIAL_SUM_VECTOR_LENGTH);
// populate delta vector
for (int i = 0; i < delta.getValueCount(); i++) {
delta.set(i, 3);
}
final long sumBase = 10;
PartialSumUtils.toPartialSumVector(delta, partialSum, sumBase);
// verify results
assertEquals(PARTIAL_SUM_VECTOR_LENGTH, partialSum.getValueCount());
for (int i = 0; i < partialSum.getValueCount(); i++) {
assertEquals(i * 3 + sumBase, partialSum.get(i));
}
}
}
@Test
public void testToDeltaVector() {
try (IntVector partialSum = new IntVector("partial sum", allocator);
IntVector delta = new IntVector("delta", allocator)) {
partialSum.allocateNew(PARTIAL_SUM_VECTOR_LENGTH);
partialSum.setValueCount(PARTIAL_SUM_VECTOR_LENGTH);
delta.allocateNew(DELTA_VECTOR_LENGTH);
// populate delta vector
final int sumBase = 10;
for (int i = 0; i < partialSum.getValueCount(); i++) {
partialSum.set(i, sumBase + 3 * i);
}
PartialSumUtils.toDeltaVector(partialSum, delta);
// verify results
assertEquals(DELTA_VECTOR_LENGTH, delta.getValueCount());
for (int i = 0; i < delta.getValueCount(); i++) {
assertEquals(3, delta.get(i));
}
}
}
@Test
public void testFindPositionInPartialSumVector() {
try (IntVector partialSum = new IntVector("partial sum", allocator)) {
partialSum.allocateNew(PARTIAL_SUM_VECTOR_LENGTH);
partialSum.setValueCount(PARTIAL_SUM_VECTOR_LENGTH);
// populate delta vector
final int sumBase = 10;
for (int i = 0; i < partialSum.getValueCount(); i++) {
partialSum.set(i, sumBase + 3 * i);
}
// search and verify results
for (int i = 0; i < PARTIAL_SUM_VECTOR_LENGTH - 1; i++) {
assertEquals(i, PartialSumUtils.findPositionInPartialSumVector(partialSum, sumBase + 3 * i + 1));
}
}
}
@Test
public void testFindPositionInPartialSumVectorNegative() {
try (IntVector partialSum = new IntVector("partial sum", allocator)) {
partialSum.allocateNew(PARTIAL_SUM_VECTOR_LENGTH);
partialSum.setValueCount(PARTIAL_SUM_VECTOR_LENGTH);
// populate delta vector
final int sumBase = 10;
for (int i = 0; i < partialSum.getValueCount(); i++) {
partialSum.set(i, sumBase + 3 * i);
}
// search and verify results
assertEquals(0, PartialSumUtils.findPositionInPartialSumVector(partialSum, sumBase));
assertEquals(-1, PartialSumUtils.findPositionInPartialSumVector(partialSum, sumBase - 1));
assertEquals(-1, PartialSumUtils.findPositionInPartialSumVector(partialSum,
sumBase + 3 * (PARTIAL_SUM_VECTOR_LENGTH - 1)));
}
}
}