/*
* 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.BlockEncodingManager;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PageBuilder;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.sql.analyzer.FeaturesConfig;
import com.facebook.presto.type.MapType;
import com.facebook.presto.type.TypeRegistry;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import org.testng.annotations.Test;
import java.io.IOException;
import java.util.Map;
import java.util.Optional;
import static com.facebook.presto.metadata.FunctionKind.AGGREGATE;
import static com.facebook.presto.operator.aggregation.AggregationTestUtils.getFinalBlock;
import static com.facebook.presto.operator.aggregation.AggregationTestUtils.getIntermediateBlock;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.spi.type.RealType.REAL;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.util.StructuralTestUtil.mapType;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;
public class TestRealHistogramAggregation
{
private final AccumulatorFactory factory;
private final Page input;
public TestRealHistogramAggregation()
{
TypeRegistry typeRegistry = new TypeRegistry();
FunctionRegistry functionRegistry = new FunctionRegistry(typeRegistry, new BlockEncodingManager(typeRegistry), new FeaturesConfig());
InternalAggregationFunction function = functionRegistry.getAggregateFunctionImplementation(
new Signature("numeric_histogram",
AGGREGATE,
parseTypeSignature("map(real, real)"),
parseTypeSignature(StandardTypes.BIGINT),
parseTypeSignature(StandardTypes.REAL),
parseTypeSignature(StandardTypes.DOUBLE)));
factory = function.bind(ImmutableList.of(0, 1, 2), Optional.empty());
input = makeInput(10);
}
@Test
public void test()
throws Exception
{
Accumulator singleStep = factory.createAccumulator();
singleStep.addInput(input);
Block expected = getFinalBlock(singleStep);
Accumulator partialStep = factory.createAccumulator();
partialStep.addInput(input);
Block partialBlock = getIntermediateBlock(partialStep);
Accumulator finalStep = factory.createAccumulator();
finalStep.addIntermediate(partialBlock);
Block actual = getFinalBlock(finalStep);
assertEquals(extractSingleValue(actual), extractSingleValue(expected));
}
@Test
public void testMerge()
throws Exception
{
Accumulator singleStep = factory.createAccumulator();
singleStep.addInput(input);
Block singleStepResult = getFinalBlock(singleStep);
Accumulator partialStep = factory.createAccumulator();
partialStep.addInput(input);
Block intermediate = getIntermediateBlock(partialStep);
Accumulator finalStep = factory.createAccumulator();
finalStep.addIntermediate(intermediate);
finalStep.addIntermediate(intermediate);
Block actual = getFinalBlock(finalStep);
Map<Float, Float> expected = Maps.transformValues(extractSingleValue(singleStepResult), value -> value * 2);
assertEquals(extractSingleValue(actual), expected);
}
@Test
public void testNull()
throws Exception
{
Accumulator accumulator = factory.createAccumulator();
Block result = getFinalBlock(accumulator);
assertTrue(result.getPositionCount() == 1);
assertTrue(result.isNull(0));
}
@Test(expectedExceptions = PrestoException.class)
public void testBadNumberOfBuckets()
{
Accumulator singleStep = factory.createAccumulator();
singleStep.addInput(makeInput(0));
getFinalBlock(singleStep);
}
private static Map<Float, Float> extractSingleValue(Block block)
throws IOException
{
MapType mapType = mapType(REAL, REAL);
return (Map<Float, Float>) mapType.getObjectValue(null, block, 0);
}
private static Page makeInput(int numberOfBuckets)
{
PageBuilder builder = new PageBuilder(ImmutableList.of(BIGINT, REAL, DOUBLE));
for (int i = 0; i < 100; i++) {
builder.declarePosition();
BIGINT.writeLong(builder.getBlockBuilder(0), numberOfBuckets);
REAL.writeLong(builder.getBlockBuilder(1), i); // value
DOUBLE.writeDouble(builder.getBlockBuilder(2), 1); // weight
}
return builder.build();
}
}