| /* |
| * 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.having; |
| |
| import com.fasterxml.jackson.annotation.JsonCreator; |
| import com.fasterxml.jackson.annotation.JsonProperty; |
| import org.apache.druid.java.util.common.StringUtils; |
| import org.apache.druid.query.aggregation.AggregatorFactory; |
| import org.apache.druid.query.cache.CacheKeyBuilder; |
| import org.apache.druid.query.groupby.GroupByQuery; |
| import org.apache.druid.query.groupby.ResultRow; |
| |
| import java.util.Map; |
| |
| /** |
| * The "=" operator in a "having" clause. This is similar to SQL's "having aggregation = value", |
| * except that in SQL an aggregation is an expression instead of an aggregation name as in Druid. |
| */ |
| public class EqualToHavingSpec implements HavingSpec |
| { |
| private final String aggregationName; |
| private final Number value; |
| |
| private volatile Map<String, AggregatorFactory> aggregators; |
| private volatile int columnNumber; |
| |
| @JsonCreator |
| public EqualToHavingSpec( |
| @JsonProperty("aggregation") String aggName, |
| @JsonProperty("value") Number value |
| ) |
| { |
| this.aggregationName = aggName; |
| this.value = value; |
| } |
| |
| @JsonProperty("value") |
| public Number getValue() |
| { |
| return value; |
| } |
| |
| @JsonProperty("aggregation") |
| public String getAggregationName() |
| { |
| return aggregationName; |
| } |
| |
| @Override |
| public void setQuery(GroupByQuery query) |
| { |
| columnNumber = query.getResultRowSignature().indexOf(aggregationName); |
| aggregators = HavingSpecUtil.computeAggregatorsMap(query.getAggregatorSpecs()); |
| } |
| |
| @Override |
| public boolean eval(ResultRow row) |
| { |
| if (columnNumber < 0) { |
| return value == null; |
| } |
| |
| Object metricVal = row.get(columnNumber); |
| if (metricVal == null || value == null) { |
| return metricVal == null && value == null; |
| } |
| return HavingSpecMetricComparator.compare(aggregationName, value, aggregators, metricVal) == 0; |
| } |
| |
| /** |
| * This method treats internal value as double mainly for ease of test. |
| */ |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| EqualToHavingSpec that = (EqualToHavingSpec) o; |
| |
| if (aggregationName != null ? !aggregationName.equals(that.aggregationName) : that.aggregationName != null) { |
| return false; |
| } |
| |
| if (value != null && that.value != null) { |
| return Double.compare(value.doubleValue(), that.value.doubleValue()) == 0; |
| } |
| |
| if (value == null && that.value == null) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result = aggregationName != null ? aggregationName.hashCode() : 0; |
| result = 31 * result + (value != null ? value.hashCode() : 0); |
| return result; |
| } |
| |
| @Override |
| public String toString() |
| { |
| final StringBuilder sb = new StringBuilder(); |
| sb.append("EqualToHavingSpec"); |
| sb.append("{aggregationName='").append(aggregationName).append('\''); |
| sb.append(", value=").append(value); |
| sb.append('}'); |
| return sb.toString(); |
| } |
| |
| @Override |
| public byte[] getCacheKey() |
| { |
| return new CacheKeyBuilder(HavingSpecUtil.CACHE_TYPE_ID_EQUAL) |
| .appendString(aggregationName) |
| .appendByteArray(StringUtils.toUtf8(String.valueOf(value))) |
| .build(); |
| } |
| } |