/*
* 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;
import com.facebook.presto.block.BlockAssertions;
import com.facebook.presto.spi.Page;
import com.google.common.collect.ImmutableList;
import org.testng.annotations.Test;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static org.testng.Assert.assertEquals;
public class TestGroupByHash
{
private static final int MAX_GROUP_ID = 500;
@Test
public void test()
throws Exception
{
GroupByHash groupByHash = new GroupByHash(ImmutableList.of(BIGINT), new int[] {0}, 100);
for (int tries = 0; tries < 2; tries++) {
for (int value = 0; value < MAX_GROUP_ID; value++) {
Page page = new Page(BlockAssertions.createLongsBlock(value));
for (int addValuesTries = 0; addValuesTries < 10; addValuesTries++) {
GroupByIdBlock groupIds = groupByHash.getGroupIds(page);
assertEquals(groupIds.getGroupCount(), tries == 0 ? value + 1 : MAX_GROUP_ID);
assertEquals(groupIds.getPositionCount(), 1);
long groupId = groupIds.getGroupId(0);
assertEquals(groupId, value);
}
}
}
}
}