/*
* 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.operator.aggregation.state.DigestAndPercentileArrayState;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
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 io.airlift.stats.QuantileDigest;
import java.util.List;
import static com.facebook.presto.operator.aggregation.FloatingPointBitsConverterUtil.doubleToSortableLong;
import static com.facebook.presto.operator.aggregation.FloatingPointBitsConverterUtil.sortableLongToDouble;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
@AggregationFunction("approx_percentile")
public final class ApproximateDoublePercentileArrayAggregations
{
private ApproximateDoublePercentileArrayAggregations() {}
@InputFunction
public static void input(@AggregationState DigestAndPercentileArrayState state, @SqlType(StandardTypes.DOUBLE) double value, @SqlType("array(double)") Block percentilesArrayBlock)
{
ApproximateLongPercentileArrayAggregations.input(state, doubleToSortableLong(value), percentilesArrayBlock);
}
@InputFunction
public static void weightedInput(@AggregationState DigestAndPercentileArrayState state, @SqlType(StandardTypes.DOUBLE) double value, @SqlType(StandardTypes.BIGINT) long weight, @SqlType("array(double)") Block percentilesArrayBlock)
{
ApproximateLongPercentileArrayAggregations.weightedInput(state, doubleToSortableLong(value), weight, percentilesArrayBlock);
}
@CombineFunction
public static void combine(@AggregationState DigestAndPercentileArrayState state, DigestAndPercentileArrayState otherState)
{
ApproximateLongPercentileArrayAggregations.combine(state, otherState);
}
@OutputFunction("array(double)")
public static void output(@AggregationState DigestAndPercentileArrayState state, BlockBuilder out)
{
QuantileDigest digest = state.getDigest();
List<Double> percentiles = state.getPercentiles();
if (percentiles == null || digest == null) {
out.appendNull();
return;
}
BlockBuilder blockBuilder = out.beginBlockEntry();
for (int i = 0; i < percentiles.size(); i++) {
Double percentile = percentiles.get(i);
DOUBLE.writeDouble(blockBuilder, sortableLongToDouble(digest.getQuantile(percentile)));
}
out.closeEntry();
}
}