/*
* 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.createLongRepeatBlock;
import static com.facebook.presto.block.BlockAssertions.createLongSequenceBlock;
import static com.facebook.presto.block.BlockAssertions.createLongsBlock;
import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT;
import static org.testng.Assert.assertEquals;
public class TestLongMaxNAggregation
extends AbstractTestAggregationFunction
{
@Override
public Block[] getSequenceBlocks(int start, int length)
{
return new Block[] {createLongSequenceBlock(start, start + length), createLongRepeatBlock(2, length)};
}
@Override
protected String getFunctionName()
{
return "max";
}
@Override
protected List<String> getFunctionParameterTypes()
{
return ImmutableList.of(StandardTypes.BIGINT, StandardTypes.BIGINT);
}
@Override
public Object getExpectedValue(int start, int length)
{
if (length == 0) {
return null;
}
if (length == 1) {
return ImmutableList.of((long) start);
}
return ImmutableList.of((long) start + length - 1, (long) start + length - 2);
}
@Test
public void testMoreCornerCases()
{
testCustomAggregation(new Long[] {1L, 2L, null, 3L}, 5);
testInvalidAggregation(new Long[] {1L, 2L, 3L}, 0);
testInvalidAggregation(new Long[] {1L, 2L, 3L}, -1);
}
private void testInvalidAggregation(Long[] x, int n)
{
try {
testAggregation(new long[] {}, createLongsBlock(x), createLongRepeatBlock(n, x.length));
}
catch (PrestoException e) {
assertEquals(e.getErrorCode().getName(), INVALID_FUNCTION_ARGUMENT.name());
}
}
private void testCustomAggregation(Long[] values, int n)
{
PriorityQueue<Long> heap = new PriorityQueue<Long>(n);
Arrays.stream(values).filter(x -> x != null).forEach(heap::add);
Long[] expected = new Long[heap.size()];
for (int i = heap.size() - 1; i >= 0; i--) {
expected[i] = heap.remove();
}
testAggregation(Arrays.asList(expected), createLongsBlock(values), createLongRepeatBlock(n, values.length));
}
}