/**
* 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.DoubleAggregationResultHolder;
import com.linkedin.pinot.core.query.aggregation.groupby.DoubleGroupByResultHolder;
import com.linkedin.pinot.core.query.aggregation.groupby.GroupByResultHolder;
import javax.annotation.Nonnull;
public class MinAggregationFunction implements AggregationFunction<Double, Double> {
private static final String NAME = AggregationFunctionFactory.AggregationFunctionType.MIN.getName();
private static final double DEFAULT_VALUE = Double.POSITIVE_INFINITY;
@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 DoubleAggregationResultHolder(DEFAULT_VALUE);
}
@Nonnull
@Override
public GroupByResultHolder createGroupByResultHolder(int initialCapacity, int maxCapacity, int trimSize) {
return new DoubleGroupByResultHolder(initialCapacity, maxCapacity, trimSize, DEFAULT_VALUE, true);
}
@Override
public void aggregate(int length, @Nonnull AggregationResultHolder aggregationResultHolder,
@Nonnull BlockValSet... blockValSets) {
double[] valueArray = blockValSets[0].getDoubleValuesSV();
double min = aggregationResultHolder.getDoubleResult();
for (int i = 0; i < length; i++) {
double value = valueArray[i];
if (value < min) {
min = value;
}
}
aggregationResultHolder.setValue(min);
}
@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++) {
double value = valueArray[i];
int groupKey = groupKeyArray[i];
if (value < groupByResultHolder.getDoubleResult(groupKey)) {
groupByResultHolder.setValueForKey(groupKey, value);
}
}
}
@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]) {
if (value < groupByResultHolder.getDoubleResult(groupKey)) {
groupByResultHolder.setValueForKey(groupKey, value);
}
}
}
}
@Nonnull
@Override
public Double extractAggregationResult(@Nonnull AggregationResultHolder aggregationResultHolder) {
return aggregationResultHolder.getDoubleResult();
}
@Nonnull
@Override
public Double extractGroupByResult(@Nonnull GroupByResultHolder groupByResultHolder, int groupKey) {
return groupByResultHolder.getDoubleResult(groupKey);
}
@Nonnull
@Override
public Double merge(@Nonnull Double intermediateResult1, @Nonnull Double intermediateResult2) {
if (intermediateResult1 < intermediateResult2) {
return intermediateResult1;
} else {
return intermediateResult2;
}
}
@Nonnull
@Override
public FieldSpec.DataType getIntermediateResultDataType() {
return FieldSpec.DataType.DOUBLE;
}
@Nonnull
@Override
public Double extractFinalResult(@Nonnull Double intermediateResult) {
return intermediateResult;
}
}