Save memory when histogram agg is not on top #57277
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| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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. | ||
| */ | ||
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| package org.elasticsearch.search.aggregations.bucket.histogram; | ||
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| import org.apache.lucene.util.CollectionUtil; | ||
| import org.elasticsearch.common.lease.Releasables; | ||
| import org.elasticsearch.search.DocValueFormat; | ||
| import org.elasticsearch.search.aggregations.Aggregator; | ||
| import org.elasticsearch.search.aggregations.AggregatorFactories; | ||
| import org.elasticsearch.search.aggregations.BucketOrder; | ||
| import org.elasticsearch.search.aggregations.InternalAggregation; | ||
| import org.elasticsearch.search.aggregations.bucket.BucketsAggregator; | ||
| import org.elasticsearch.search.aggregations.bucket.histogram.InternalHistogram.EmptyBucketInfo; | ||
| import org.elasticsearch.search.aggregations.bucket.terms.LongKeyedBucketOrds; | ||
| import org.elasticsearch.search.internal.SearchContext; | ||
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| import java.io.IOException; | ||
| import java.util.Collections; | ||
| import java.util.Map; | ||
| import java.util.function.BiConsumer; | ||
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||
| /** | ||
| * Base class for functionality shared between aggregators for this | ||
| * {@code histogram} aggregation. | ||
| */ | ||
| public abstract class AbstractHistogramAggregator extends BucketsAggregator { | ||
| protected final DocValueFormat formatter; | ||
| protected final double interval; | ||
| protected final double offset; | ||
| protected final BucketOrder order; | ||
| protected final boolean keyed; | ||
| protected final long minDocCount; | ||
| protected final double minBound; | ||
| protected final double maxBound; | ||
| protected final LongKeyedBucketOrds bucketOrds; | ||
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| public AbstractHistogramAggregator( | ||
| String name, | ||
| AggregatorFactories factories, | ||
| double interval, | ||
| double offset, | ||
| BucketOrder order, | ||
| boolean keyed, | ||
| long minDocCount, | ||
| double minBound, | ||
| double maxBound, | ||
| DocValueFormat formatter, | ||
| SearchContext context, | ||
| Aggregator parent, | ||
| boolean collectsFromSingleBucket, | ||
| Map<String, Object> metadata | ||
| ) throws IOException { | ||
| super(name, factories, context, parent, metadata); | ||
| if (interval <= 0) { | ||
| throw new IllegalArgumentException("interval must be positive, got: " + interval); | ||
| } | ||
| this.interval = interval; | ||
| this.offset = offset; | ||
| this.order = order; | ||
| order.validate(this); | ||
| this.keyed = keyed; | ||
| this.minDocCount = minDocCount; | ||
| this.minBound = minBound; | ||
| this.maxBound = maxBound; | ||
| this.formatter = formatter; | ||
| bucketOrds = LongKeyedBucketOrds.build(context.bigArrays(), collectsFromSingleBucket); | ||
| } | ||
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| @Override | ||
| public InternalAggregation[] buildAggregations(long[] owningBucketOrds) throws IOException { | ||
| return buildAggregationsForVariableBuckets(owningBucketOrds, bucketOrds, | ||
| (bucketValue, docCount, subAggregationResults) -> { | ||
| double roundKey = Double.longBitsToDouble(bucketValue); | ||
| double key = roundKey * interval + offset; | ||
| return new InternalHistogram.Bucket(key, docCount, keyed, formatter, subAggregationResults); | ||
| }, buckets -> { | ||
| // the contract of the histogram aggregation is that shards must return buckets ordered by key in ascending order | ||
| CollectionUtil.introSort(buckets, BucketOrder.key(true).comparator()); | ||
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| EmptyBucketInfo emptyBucketInfo = null; | ||
| if (minDocCount == 0) { | ||
| emptyBucketInfo = new EmptyBucketInfo(interval, offset, minBound, maxBound, buildEmptySubAggregations()); | ||
| } | ||
| return new InternalHistogram(name, buckets, order, minDocCount, emptyBucketInfo, formatter, keyed, metadata()); | ||
| }); | ||
| } | ||
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| @Override | ||
| public InternalAggregation buildEmptyAggregation() { | ||
| InternalHistogram.EmptyBucketInfo emptyBucketInfo = null; | ||
| if (minDocCount == 0) { | ||
| emptyBucketInfo = new InternalHistogram.EmptyBucketInfo(interval, offset, minBound, maxBound, buildEmptySubAggregations()); | ||
| } | ||
| return new InternalHistogram(name, Collections.emptyList(), order, minDocCount, emptyBucketInfo, formatter, keyed, metadata()); | ||
| } | ||
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| @Override | ||
| public void doClose() { | ||
| Releasables.close(bucketOrds); | ||
| } | ||
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| @Override | ||
| public void collectDebugInfo(BiConsumer<String, Object> add) { | ||
| add.accept("total_buckets", bucketOrds.size()); | ||
| super.collectDebugInfo(add); | ||
| } | ||
| } | ||
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There was a TODO that the range and numeric version of the aggregator shared a ton of code. Now they share a superclass that provides all that code.