/*
* 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.metadata.FunctionKind;
import com.facebook.presto.metadata.MetadataManager;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.operator.aggregation.AbstractTestAggregationFunction;
import com.facebook.presto.operator.aggregation.InternalAggregationFunction;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.type.StandardTypes;
import com.google.common.collect.ImmutableList;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;
import java.util.List;
import static com.facebook.presto.block.BlockAssertions.createBlockOfReals;
import static com.facebook.presto.operator.aggregation.AggregationTestUtils.assertAggregation;
import static com.facebook.presto.spi.type.RealType.REAL;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static java.lang.Float.floatToRawIntBits;
@Test(singleThreaded = true)
public class TestRealAverageAggregation
extends AbstractTestAggregationFunction
{
private InternalAggregationFunction avgFunction;
@BeforeClass
public void setUp()
{
MetadataManager metadata = MetadataManager.createTestMetadataManager();
avgFunction = metadata.getFunctionRegistry().getAggregateFunctionImplementation(
new Signature("avg", FunctionKind.AGGREGATE, parseTypeSignature(StandardTypes.REAL), parseTypeSignature(StandardTypes.REAL)));
}
@Test
public void averageOfNullIsNull()
{
assertAggregation(avgFunction,
null,
createBlockOfReals(null, null));
}
@Test
public void averageOfSingleValueEqualsThatValue()
{
assertAggregation(avgFunction,
1.23f,
createBlockOfReals(1.23f));
}
@Test
public void averageOfTwoMaxFloatsEqualsMaxFloat()
{
assertAggregation(avgFunction,
Float.MAX_VALUE,
createBlockOfReals(Float.MAX_VALUE, Float.MAX_VALUE));
}
@Override
public Block[] getSequenceBlocks(int start, int length)
{
BlockBuilder blockBuilder = REAL.createBlockBuilder(new BlockBuilderStatus(), length);
for (int i = start; i < start + length; i++) {
REAL.writeLong(blockBuilder, floatToRawIntBits((float) i));
}
return new Block[] {blockBuilder.build()};
}
@Override
protected String getFunctionName()
{
return "avg";
}
@Override
protected List<String> getFunctionParameterTypes()
{
return ImmutableList.of(StandardTypes.REAL);
}
@Override
public Object getExpectedValue(int start, int length)
{
if (length == 0) {
return null;
}
float sum = 0;
for (int i = start; i < start + length; i++) {
sum += i;
}
return sum / length;
}
}