/*
* 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.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.function.AggregationFunction;
import com.facebook.presto.spi.function.AggregationState;
import com.facebook.presto.spi.function.CombineFunction;
import com.facebook.presto.spi.function.InputFunction;
import com.facebook.presto.spi.function.OutputFunction;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.type.StandardTypes;
import java.util.Map;
import static com.facebook.presto.spi.type.RealType.REAL;
import static java.lang.Float.floatToRawIntBits;
import static java.lang.Float.intBitsToFloat;
@AggregationFunction("numeric_histogram")
public class RealHistogramAggregation
{
private RealHistogramAggregation()
{
}
@InputFunction
public static void add(@AggregationState DoubleHistogramAggregation.State state, @SqlType(StandardTypes.BIGINT) long buckets, @SqlType(StandardTypes.REAL) long value, @SqlType(StandardTypes.DOUBLE) double weight)
{
DoubleHistogramAggregation.add(state, buckets, intBitsToFloat((int) value), weight);
}
@InputFunction
public static void add(@AggregationState DoubleHistogramAggregation.State state, @SqlType(StandardTypes.BIGINT) long buckets, @SqlType(StandardTypes.REAL) long value)
{
add(state, buckets, value, 1);
}
@CombineFunction
public static void merge(@AggregationState DoubleHistogramAggregation.State state, @AggregationState DoubleHistogramAggregation.State other)
{
DoubleHistogramAggregation.merge(state, other);
}
@OutputFunction("map(real,real)")
public static void output(@AggregationState DoubleHistogramAggregation.State state, BlockBuilder out)
{
if (state.get() == null) {
out.appendNull();
}
else {
Map<Double, Double> value = state.get().getBuckets();
BlockBuilder blockBuilder = REAL.createBlockBuilder(new BlockBuilderStatus(), value.size() * 2);
for (Map.Entry<Double, Double> entry : value.entrySet()) {
REAL.writeLong(blockBuilder, floatToRawIntBits(entry.getKey().floatValue()));
REAL.writeLong(blockBuilder, floatToRawIntBits(entry.getValue().floatValue()));
}
Block block = blockBuilder.build();
out.writeObject(block);
out.closeEntry();
}
}
}