org.apache.druid.query.groupby.epinephelinae.GroupByBinaryFnV2.java Source code

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Here is the source code for org.apache.druid.query.groupby.epinephelinae.GroupByBinaryFnV2.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.druid.query.groupby.epinephelinae;

import com.google.common.collect.Maps;
import org.apache.druid.data.input.MapBasedRow;
import org.apache.druid.data.input.Row;
import org.apache.druid.java.util.common.granularity.AllGranularity;
import org.apache.druid.java.util.common.guava.nary.BinaryFn;
import org.apache.druid.query.aggregation.AggregatorFactory;
import org.apache.druid.query.dimension.DimensionSpec;
import org.apache.druid.query.groupby.GroupByQuery;
import org.joda.time.DateTime;

import java.util.Map;

public class GroupByBinaryFnV2 implements BinaryFn<Row, Row, Row> {
    private final GroupByQuery query;

    public GroupByBinaryFnV2(GroupByQuery query) {
        this.query = query;
    }

    @Override
    public Row apply(final Row arg1, final Row arg2) {
        if (arg1 == null) {
            return arg2;
        } else if (arg2 == null) {
            return arg1;
        }

        final Map<String, Object> newMap = Maps
                .newHashMapWithExpectedSize(query.getDimensions().size() + query.getAggregatorSpecs().size());

        // Add dimensions
        for (DimensionSpec dimension : query.getDimensions()) {
            newMap.put(dimension.getOutputName(), arg1.getRaw(dimension.getOutputName()));
        }

        // Add aggregations
        for (AggregatorFactory aggregatorFactory : query.getAggregatorSpecs()) {
            newMap.put(aggregatorFactory.getName(), aggregatorFactory
                    .combine(arg1.getRaw(aggregatorFactory.getName()), arg2.getRaw(aggregatorFactory.getName())));
        }

        return new MapBasedRow(adjustTimestamp(arg1), newMap);
    }

    private DateTime adjustTimestamp(final Row row) {
        if (query.getGranularity() instanceof AllGranularity) {
            return row.getTimestamp();
        } else {
            return query.getGranularity().bucketStart(row.getTimestamp());
        }
    }
}