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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.
*/
package org.elasticsearch.search.aggregations.metrics;
import org.apache.lucene.document.LongPoint;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.PointValues;
import org.apache.lucene.search.CollectionTerminatedException;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.util.Bits;
import org.apache.lucene.search.ScoreMode;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.DoubleArray;
import org.elasticsearch.index.fielddata.NumericDoubleValues;
import org.elasticsearch.index.fielddata.SortedNumericDoubleValues;
import org.elasticsearch.index.mapper.DateFieldMapper;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.mapper.NumberFieldMapper;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.MultiValueMode;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.LeafBucketCollector;
import org.elasticsearch.search.aggregations.LeafBucketCollectorBase;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
class MinAggregator extends NumericMetricsAggregator.SingleValue {
private static final int MAX_BKD_LOOKUPS = 1024;
final ValuesSource.Numeric valuesSource;
final DocValueFormat format;
final String pointField;
final Function pointConverter;
DoubleArray mins;
MinAggregator(String name,
ValuesSourceConfig config,
ValuesSource.Numeric valuesSource,
SearchContext context,
Aggregator parent,
List pipelineAggregators,
Map metaData) throws IOException {
super(name, context, parent, pipelineAggregators, metaData);
this.valuesSource = valuesSource;
if (valuesSource != null) {
mins = context.bigArrays().newDoubleArray(1, false);
mins.fill(0, mins.size(), Double.POSITIVE_INFINITY);
}
this.format = config.format();
this.pointConverter = getPointReaderOrNull(context, parent, config);
if (pointConverter != null) {
pointField = config.fieldContext().field();
} else {
pointField = null;
}
}
@Override
public ScoreMode scoreMode() {
return valuesSource != null && valuesSource.needsScores() ? ScoreMode.COMPLETE : ScoreMode.COMPLETE_NO_SCORES;
}
@Override
public LeafBucketCollector getLeafCollector(LeafReaderContext ctx,
final LeafBucketCollector sub) throws IOException {
if (valuesSource == null) {
if (parent == null) {
return LeafBucketCollector.NO_OP_COLLECTOR;
} else {
// we have no parent and the values source is empty so we can skip collecting hits.
throw new CollectionTerminatedException();
}
}
if (pointConverter != null) {
Number segMin = findLeafMinValue(ctx.reader(), pointField, pointConverter);
if (segMin != null) {
/*
* There is no parent aggregator (see {@link MinAggregator#getPointReaderOrNull}
* so the ordinal for the bucket is always 0.
*/
double min = mins.get(0);
min = Math.min(min, segMin.doubleValue());
mins.set(0, min);
// the minimum value has been extracted, we don't need to collect hits on this segment.
throw new CollectionTerminatedException();
}
}
final BigArrays bigArrays = context.bigArrays();
final SortedNumericDoubleValues allValues = valuesSource.doubleValues(ctx);
final NumericDoubleValues values = MultiValueMode.MIN.select(allValues);
return new LeafBucketCollectorBase(sub, allValues) {
@Override
public void collect(int doc, long bucket) throws IOException {
if (bucket >= mins.size()) {
long from = mins.size();
mins = bigArrays.grow(mins, bucket + 1);
mins.fill(from, mins.size(), Double.POSITIVE_INFINITY);
}
if (values.advanceExact(doc)) {
final double value = values.doubleValue();
double min = mins.get(bucket);
min = Math.min(min, value);
mins.set(bucket, min);
}
}
};
}
@Override
public double metric(long owningBucketOrd) {
if (valuesSource == null || owningBucketOrd >= mins.size()) {
return Double.POSITIVE_INFINITY;
}
return mins.get(owningBucketOrd);
}
@Override
public InternalAggregation buildAggregation(long bucket) {
if (valuesSource == null || bucket >= mins.size()) {
return buildEmptyAggregation();
}
return new InternalMin(name, mins.get(bucket), format, pipelineAggregators(), metaData());
}
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalMin(name, Double.POSITIVE_INFINITY, format, pipelineAggregators(), metaData());
}
@Override
public void doClose() {
Releasables.close(mins);
}
/**
* Returns a converter for point values if early termination is applicable to
* the context or null otherwise.
*
* @param context The {@link SearchContext} of the aggregation.
* @param parent The parent aggregator.
* @param config The config for the values source metric.
*/
static Function getPointReaderOrNull(SearchContext context, Aggregator parent,
ValuesSourceConfig config) {
if (context.query() != null &&
context.query().getClass() != MatchAllDocsQuery.class) {
return null;
}
if (parent != null) {
return null;
}
if (config.fieldContext() != null && config.script() == null && config.missing() == null) {
MappedFieldType fieldType = config.fieldContext().fieldType();
if (fieldType == null || fieldType.indexOptions() == IndexOptions.NONE) {
return null;
}
Function converter = null;
if (fieldType instanceof NumberFieldMapper.NumberFieldType) {
converter = ((NumberFieldMapper.NumberFieldType) fieldType)::parsePoint;
} else if (fieldType.getClass() == DateFieldMapper.DateFieldType.class) {
DateFieldMapper.DateFieldType dft = (DateFieldMapper.DateFieldType) fieldType;
/*
* Makes sure that nanoseconds decode to milliseconds, just
* like they do when you run the agg without the optimization.
*/
converter = (in) -> dft.resolution().toInstant(LongPoint.decodeDimension(in, 0)).toEpochMilli();
}
return converter;
}
return null;
}
/**
* Returns the minimum value indexed in the fieldName field or null
* if the value cannot be inferred from the indexed {@link PointValues}.
*/
static Number findLeafMinValue(LeafReader reader, String fieldName, Function converter) throws IOException {
final PointValues pointValues = reader.getPointValues(fieldName);
if (pointValues == null) {
return null;
}
final Bits liveDocs = reader.getLiveDocs();
if (liveDocs == null) {
return converter.apply(pointValues.getMinPackedValue());
}
final Number[] result = new Number[1];
try {
pointValues.intersect(new PointValues.IntersectVisitor() {
private short lookupCounter = 0;
@Override
public void visit(int docID) {
throw new UnsupportedOperationException();
}
@Override
public void visit(int docID, byte[] packedValue) {
if (liveDocs.get(docID)) {
result[0] = converter.apply(packedValue);
// this is the first leaf with a live doc so the value is the minimum for this segment.
throw new CollectionTerminatedException();
}
if (++lookupCounter > MAX_BKD_LOOKUPS) {
throw new CollectionTerminatedException();
}
}
@Override
public PointValues.Relation compare(byte[] minPackedValue, byte[] maxPackedValue) {
return PointValues.Relation.CELL_CROSSES_QUERY;
}
});
} catch (CollectionTerminatedException e) {}
return result[0];
}
}