| /* |
| * 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.aggregation; |
| |
| import com.fasterxml.jackson.annotation.JacksonInject; |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import com.google.common.base.Supplier; |
| import org.apache.druid.math.expr.ExprMacroTable; |
| import org.apache.druid.segment.BaseLongColumnValueSelector; |
| import org.apache.druid.segment.vector.VectorColumnSelectorFactory; |
| import org.apache.druid.segment.vector.VectorValueSelector; |
| |
| import javax.annotation.Nullable; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| */ |
| public class LongMaxAggregatorFactory extends SimpleLongAggregatorFactory |
| { |
| private final Supplier<byte[]> cacheKey; |
| |
| @JsonCreator |
| public LongMaxAggregatorFactory( |
| @JsonProperty("name") String name, |
| @JsonProperty("fieldName") final String fieldName, |
| @JsonProperty("expression") @Nullable String expression, |
| @JacksonInject ExprMacroTable macroTable |
| ) |
| { |
| super(macroTable, name, fieldName, expression); |
| this.cacheKey = AggregatorUtil.getSimpleAggregatorCacheKeySupplier( |
| AggregatorUtil.LONG_MAX_CACHE_TYPE_ID, |
| fieldName, |
| fieldExpression |
| ); |
| } |
| |
| public LongMaxAggregatorFactory(String name, String fieldName) |
| { |
| this(name, fieldName, null, ExprMacroTable.nil()); |
| } |
| |
| @Override |
| protected long nullValue() |
| { |
| return Long.MIN_VALUE; |
| } |
| |
| @Override |
| protected Aggregator buildAggregator(BaseLongColumnValueSelector selector) |
| { |
| return new LongMaxAggregator(selector); |
| } |
| |
| @Override |
| protected BufferAggregator buildBufferAggregator(BaseLongColumnValueSelector selector) |
| { |
| return new LongMaxBufferAggregator(selector); |
| } |
| |
| @Override |
| protected VectorAggregator factorizeVector( |
| VectorColumnSelectorFactory columnSelectorFactory, |
| VectorValueSelector selector |
| ) |
| { |
| return new LongMaxVectorAggregator(selector); |
| } |
| |
| @Override |
| @Nullable |
| public Object combine(@Nullable Object lhs, @Nullable Object rhs) |
| { |
| if (rhs == null) { |
| return lhs; |
| } |
| if (lhs == null) { |
| return rhs; |
| } |
| return LongMaxAggregator.combineValues(lhs, rhs); |
| } |
| |
| @Override |
| public AggregateCombiner makeAggregateCombiner() |
| { |
| return new LongMaxAggregateCombiner(); |
| } |
| |
| @Override |
| public AggregatorFactory getCombiningFactory() |
| { |
| return new LongMaxAggregatorFactory(name, name, null, macroTable); |
| } |
| |
| @Override |
| public List<AggregatorFactory> getRequiredColumns() |
| { |
| return Collections.singletonList(new LongMaxAggregatorFactory(fieldName, fieldName, expression, macroTable)); |
| } |
| |
| @Override |
| public byte[] getCacheKey() |
| { |
| return cacheKey.get(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "LongMaxAggregatorFactory{" + |
| "fieldName='" + fieldName + '\'' + |
| ", expression='" + expression + '\'' + |
| ", name='" + name + '\'' + |
| '}'; |
| } |
| } |