/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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.linkedin.pinot.core.query.aggregation.function;
import com.linkedin.pinot.common.data.FieldSpec;
import com.linkedin.pinot.core.common.BlockValSet;
import com.linkedin.pinot.core.query.aggregation.AggregationResultHolder;
import com.linkedin.pinot.core.query.aggregation.ObjectAggregationResultHolder;
import com.linkedin.pinot.core.query.aggregation.function.customobject.QuantileDigest;
import com.linkedin.pinot.core.query.aggregation.groupby.GroupByResultHolder;
import com.linkedin.pinot.core.query.aggregation.groupby.ObjectGroupByResultHolder;
import javax.annotation.Nonnull;
public class PercentileEstAggregationFunction implements AggregationFunction<QuantileDigest, Long> {
public static final double DEFAULT_MAX_ERROR = 0.05;
private final String _name;
private final int _percentile;
public PercentileEstAggregationFunction(int percentile) {
switch (percentile) {
case 50:
_name = AggregationFunctionFactory.AggregationFunctionType.PERCENTILEEST50.getName();
break;
case 90:
_name = AggregationFunctionFactory.AggregationFunctionType.PERCENTILEEST90.getName();
break;
case 95:
_name = AggregationFunctionFactory.AggregationFunctionType.PERCENTILEEST95.getName();
break;
case 99:
_name = AggregationFunctionFactory.AggregationFunctionType.PERCENTILEEST99.getName();
break;
default:
throw new UnsupportedOperationException(
"Unsupported percentile for PercentileEstAggregationFunction: " + percentile);
}
_percentile = percentile;
}
@Nonnull
@Override
public String getName() {
return _name;
}
@Nonnull
@Override
public String getColumnName(@Nonnull String[] columns) {
return _name + "_" + columns[0];
}
@Override
public void accept(@Nonnull AggregationFunctionVisitorBase visitor) {
visitor.visit(this);
}
@Nonnull
@Override
public AggregationResultHolder createAggregationResultHolder() {
return new ObjectAggregationResultHolder();
}
@Nonnull
@Override
public GroupByResultHolder createGroupByResultHolder(int initialCapacity, int maxCapacity, int trimSize) {
return new ObjectGroupByResultHolder(initialCapacity, maxCapacity, trimSize);
}
@Override
public void aggregate(int length, @Nonnull AggregationResultHolder aggregationResultHolder,
@Nonnull BlockValSet... blockValSets) {
double[] valueArray = blockValSets[0].getDoubleValuesSV();
QuantileDigest quantileDigest = aggregationResultHolder.getResult();
if (quantileDigest == null) {
quantileDigest = new QuantileDigest(DEFAULT_MAX_ERROR);
aggregationResultHolder.setValue(quantileDigest);
}
for (int i = 0; i < length; i++) {
quantileDigest.add((long) valueArray[i]);
}
}
@Override
public void aggregateGroupBySV(int length, @Nonnull int[] groupKeyArray,
@Nonnull GroupByResultHolder groupByResultHolder, @Nonnull BlockValSet... blockValSets) {
double[] valueArray = blockValSets[0].getDoubleValuesSV();
for (int i = 0; i < length; i++) {
int groupKey = groupKeyArray[i];
QuantileDigest quantileDigest = groupByResultHolder.getResult(groupKey);
if (quantileDigest == null) {
quantileDigest = new QuantileDigest(DEFAULT_MAX_ERROR);
groupByResultHolder.setValueForKey(groupKey, quantileDigest);
}
quantileDigest.add((long) valueArray[i]);
}
}
@Override
public void aggregateGroupByMV(int length, @Nonnull int[][] groupKeysArray,
@Nonnull GroupByResultHolder groupByResultHolder, @Nonnull BlockValSet... blockValSets) {
double[] valueArray = blockValSets[0].getDoubleValuesSV();
for (int i = 0; i < length; i++) {
double value = valueArray[i];
for (int groupKey : groupKeysArray[i]) {
QuantileDigest quantileDigest = groupByResultHolder.getResult(groupKey);
if (quantileDigest == null) {
quantileDigest = new QuantileDigest(DEFAULT_MAX_ERROR);
groupByResultHolder.setValueForKey(groupKey, quantileDigest);
}
quantileDigest.add((long) value);
}
}
}
@Nonnull
@Override
public QuantileDigest extractAggregationResult(@Nonnull AggregationResultHolder aggregationResultHolder) {
QuantileDigest quantileDigest = aggregationResultHolder.getResult();
if (quantileDigest == null) {
return new QuantileDigest(DEFAULT_MAX_ERROR);
} else {
return quantileDigest;
}
}
@Nonnull
@Override
public QuantileDigest extractGroupByResult(@Nonnull GroupByResultHolder groupByResultHolder, int groupKey) {
QuantileDigest quantileDigest = groupByResultHolder.getResult(groupKey);
if (quantileDigest == null) {
return new QuantileDigest(DEFAULT_MAX_ERROR);
} else {
return quantileDigest;
}
}
@Nonnull
@Override
public QuantileDigest merge(@Nonnull QuantileDigest intermediateResult1,
@Nonnull QuantileDigest intermediateResult2) {
intermediateResult1.merge(intermediateResult2);
return intermediateResult1;
}
@Nonnull
@Override
public FieldSpec.DataType getIntermediateResultDataType() {
return FieldSpec.DataType.OBJECT;
}
@Nonnull
@Override
public Long extractFinalResult(@Nonnull QuantileDigest intermediateResult) {
return intermediateResult.getQuantile(_percentile / 100.0);
}
}