/*
* Licensed 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 com.facebook.presto.operator.aggregation;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.StandardTypes;
import com.google.common.collect.ImmutableList;
import org.testng.annotations.Test;
import java.util.Arrays;
import java.util.List;
import java.util.PriorityQueue;
import static com.facebook.presto.block.BlockAssertions.createDoubleSequenceBlock;
import static com.facebook.presto.block.BlockAssertions.createDoublesBlock;
import static com.facebook.presto.block.BlockAssertions.createLongRepeatBlock;
import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT;
import static org.testng.Assert.assertEquals;
public class TestDoubleMinNAggregation
extends AbstractTestAggregationFunction
{
@Override
public Block[] getSequenceBlocks(int start, int length)
{
return new Block[] {createDoubleSequenceBlock(start, start + length), createLongRepeatBlock(2, length)};
}
@Override
protected String getFunctionName()
{
return "min";
}
@Override
protected List<String> getFunctionParameterTypes()
{
return ImmutableList.of(StandardTypes.DOUBLE, StandardTypes.BIGINT);
}
@Override
public Object getExpectedValue(int start, int length)
{
if (length == 0) {
return null;
}
if (length == 1) {
return ImmutableList.of((double) start);
}
return ImmutableList.of((double) start, (double) start + 1);
}
@Test
public void testMoreCornerCases()
{
testCustomAggregation(new Double[] {1.0, 2.0, null, 3.0}, 5);
testInvalidAggregation(new Double[] {1.0, 2.0, 3.0}, 0);
testInvalidAggregation(new Double[] {1.0, 2.0, 3.0}, -1);
}
private void testInvalidAggregation(Double[] x, int n)
{
try {
testAggregation(new long[] {}, createDoublesBlock(x), createLongRepeatBlock(n, x.length));
}
catch (PrestoException e) {
assertEquals(e.getErrorCode().getName(), INVALID_FUNCTION_ARGUMENT.name());
}
}
private void testCustomAggregation(Double[] values, int n)
{
PriorityQueue<Double> heap = new PriorityQueue<>(n, (x, y) -> -Double.compare(x, y));
Arrays.stream(values).filter(x -> x != null).forEach(heap::add);
Double[] expected = new Double[heap.size()];
for (int i = heap.size() - 1; i >= 0; i--) {
expected[i] = heap.remove();
}
testAggregation(Arrays.asList(expected), createDoublesBlock(values), createLongRepeatBlock(n, values.length));
}
}