/*
* 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.block.rle.RunLengthEncodedBlock;
import com.facebook.presto.metadata.FunctionRegistry;
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.Type;
import com.facebook.presto.sql.tree.QualifiedName;
import com.facebook.presto.type.TypeRegistry;
import org.testng.annotations.Test;
import java.util.List;
import static com.facebook.presto.operator.aggregation.AggregationTestUtils.assertAggregation;
public abstract class AbstractTestAggregationFunction
{
protected final FunctionRegistry functionRegistry = new FunctionRegistry(new TypeRegistry(), true);
public abstract Block getSequenceBlock(int start, int length);
protected final InternalAggregationFunction getFunction()
{
return functionRegistry.resolveFunction(QualifiedName.of(getFunctionName()), getFunctionParameterTypes(), isApproximate()).getAggregationFunction();
}
protected abstract String getFunctionName();
protected abstract List<String> getFunctionParameterTypes();
protected boolean isApproximate()
{
return false;
}
public abstract Object getExpectedValue(int start, int length);
public double getConfidence()
{
return 1.0;
}
public Object getExpectedValueIncludingNulls(int start, int length, int lengthIncludingNulls)
{
return getExpectedValue(start, length);
}
@Test
public void testNoPositions()
{
testAggregation(getExpectedValue(0, 0), getSequenceBlock(0, 0));
}
@Test
public void testSinglePosition()
{
testAggregation(getExpectedValue(0, 1), getSequenceBlock(0, 1));
}
@Test
public void testMultiplePositions()
{
testAggregation(getExpectedValue(0, 5), getSequenceBlock(0, 5));
}
@Test
public void testAllPositionsNull()
throws Exception
{
// if there are no parameters skip this test
List<Type> parameterTypes = getFunction().getParameterTypes();
if (parameterTypes.isEmpty()) {
return;
}
Block nullValueBlock = parameterTypes.get(0).createBlockBuilder(new BlockBuilderStatus())
.appendNull()
.build();
Block block = new RunLengthEncodedBlock(nullValueBlock, 10);
testAggregation(getExpectedValueIncludingNulls(0, 0, 10), block);
}
@Test
public void testMixedNullAndNonNullPositions()
{
// if there are no parameters skip this test
List<Type> parameterTypes = getFunction().getParameterTypes();
if (parameterTypes.isEmpty()) {
return;
}
Block alternatingNullsBlock = createAlternatingNullsBlock(parameterTypes.get(0), getSequenceBlock(0, 10));
testAggregation(getExpectedValueIncludingNulls(0, 10, 20), alternatingNullsBlock);
}
@Test
public void testNegativeOnlyValues()
{
testAggregation(getExpectedValue(-10, 5), getSequenceBlock(-10, 5));
}
@Test
public void testPositiveOnlyValues()
{
testAggregation(getExpectedValue(2, 4), getSequenceBlock(2, 4));
}
public Block createAlternatingNullsBlock(Type type, Block sequenceBlock)
{
BlockBuilder blockBuilder = type.createBlockBuilder(new BlockBuilderStatus());
for (int position = 0; position < sequenceBlock.getPositionCount(); position++) {
// append null
blockBuilder.appendNull();
// append value
type.appendTo(sequenceBlock, position, blockBuilder);
}
return blockBuilder.build();
}
protected void testAggregation(Object expectedValue, Block block)
{
assertAggregation(getFunction(), getConfidence(), expectedValue, block.getPositionCount(), block);
}
}