/*
* 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.Block;
import com.facebook.presto.block.BlockBuilder;
import com.facebook.presto.block.BlockCursor;
import com.facebook.presto.block.rle.RunLengthEncodedBlock;
import org.testng.annotations.Test;
import static com.facebook.presto.operator.aggregation.AggregationTestUtils.assertAggregation;
import static com.facebook.presto.tuple.Tuples.nullTuple;
public abstract class AbstractTestAggregationFunction
{
public abstract Block getSequenceBlock(int start, int length);
public abstract AggregationFunction getFunction();
public abstract Object getExpectedValue(int start, int length);
public Object getExpectedValueIncludingNulls(int start, int length, int lengthIncludingNulls)
{
return getExpectedValue(start, length);
}
@Test
public void testNoPositions()
{
assertAggregation(getFunction(), getExpectedValue(0, 0), 0);
}
@Test
public void testSinglePosition()
{
assertAggregation(getFunction(), getExpectedValue(0, 1), 1, getSequenceBlock(0, 1));
}
@Test
public void testMultiplePositions()
{
assertAggregation(getFunction(), getExpectedValue(0, 5), 5, getSequenceBlock(0, 5));
}
@Test
public void testAllPositionsNull()
throws Exception
{
Block block = new RunLengthEncodedBlock(nullTuple(getSequenceBlock(0, 10).getTupleInfo()), 10);
assertAggregation(getFunction(), getExpectedValueIncludingNulls(0, 0, 10), 10, block);
}
@Test
public void testMixedNullAndNonNullPositions()
{
Block alternatingNullsBlock = createAlternatingNullsBlock(getSequenceBlock(0, 10));
assertAggregation(getFunction(), getExpectedValueIncludingNulls(0, 10, 20), 20, alternatingNullsBlock);
}
@Test
public void testNegativeOnlyValues()
{
assertAggregation(getFunction(), getExpectedValue(-10, 5), 5, getSequenceBlock(-10, 5));
}
@Test
public void testPositiveOnlyValues()
{
assertAggregation(getFunction(), getExpectedValue(2, 4), 4, getSequenceBlock(2, 4));
}
public Block createAlternatingNullsBlock(Block sequenceBlock)
{
BlockBuilder blockBuilder = new BlockBuilder(sequenceBlock.getTupleInfo());
BlockCursor cursor = sequenceBlock.cursor();
while (cursor.advanceNextPosition()) {
blockBuilder.appendNull().append(cursor.getTuple());
}
return blockBuilder.build();
}
}