leventov commented on a change in pull request #6397: Adds bloom filter aggregator to 'druid-bloom-filters' extension URL: https://github.com/apache/incubator-druid/pull/6397#discussion_r249414709
########## File path: extensions-core/druid-bloom-filter/src/main/java/org/apache/druid/query/aggregation/bloom/BloomFilterAggregatorFactory.java ########## @@ -0,0 +1,253 @@ +/* + * 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.bloom; + +import com.fasterxml.jackson.annotation.JsonCreator; +import com.fasterxml.jackson.annotation.JsonProperty; +import org.apache.commons.codec.binary.Base64; +import org.apache.druid.guice.BloomFilterSerializersModule; +import org.apache.druid.java.util.common.RE; +import org.apache.druid.java.util.common.StringUtils; +import org.apache.druid.query.ColumnSelectorPlus; +import org.apache.druid.query.aggregation.Aggregator; +import org.apache.druid.query.aggregation.AggregatorFactory; +import org.apache.druid.query.aggregation.AggregatorUtil; +import org.apache.druid.query.aggregation.BufferAggregator; +import org.apache.druid.query.aggregation.bloom.types.BloomFilterAggregatorColumnSelectorStrategy; +import org.apache.druid.query.aggregation.bloom.types.BloomFilterAggregatorColumnSelectorStrategyFactory; +import org.apache.druid.query.cache.CacheKeyBuilder; +import org.apache.druid.query.dimension.DimensionSpec; +import org.apache.druid.query.filter.BloomKFilter; +import org.apache.druid.segment.ColumnSelectorFactory; +import org.apache.druid.segment.DimensionHandlerUtils; + +import javax.annotation.Nullable; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.Collections; +import java.util.Comparator; +import java.util.List; +import java.util.Objects; + +public class BloomFilterAggregatorFactory extends AggregatorFactory +{ + private static final int DEFAULT_NUM_ENTRIES = 1500; + protected static final BloomFilterAggregatorColumnSelectorStrategyFactory STRATEGY_FACTORY = + new BloomFilterAggregatorColumnSelectorStrategyFactory(); + + private final String name; + private final DimensionSpec field; + private final int maxNumEntries; + + @JsonCreator + public BloomFilterAggregatorFactory( + @JsonProperty("name") String name, + @JsonProperty("field") final DimensionSpec field, + @Nullable @JsonProperty("maxNumEntries") Integer maxNumEntries + ) + { + this.name = name; + this.field = field; + this.maxNumEntries = maxNumEntries != null ? maxNumEntries : DEFAULT_NUM_ENTRIES; + } + + @Override + public Aggregator factorize(ColumnSelectorFactory columnFactory) + { + ColumnSelectorPlus<BloomFilterAggregatorColumnSelectorStrategy> selectorPlus = + DimensionHandlerUtils.createColumnSelectorPlus( + STRATEGY_FACTORY, + field, + columnFactory + ); + + return new BloomFilterAggregator(selectorPlus, maxNumEntries); + } + + @Override + public BufferAggregator factorizeBuffered(ColumnSelectorFactory columnFactory) + { + ColumnSelectorPlus<BloomFilterAggregatorColumnSelectorStrategy> selectorPlus = + DimensionHandlerUtils.createColumnSelectorPlus( + STRATEGY_FACTORY, + field, + columnFactory + ); + + return new BloomFilterBufferAggregator(selectorPlus, maxNumEntries); + } + + @Override + public Comparator getComparator() + { + return Comparator.nullsFirst((o1, o2) -> { + if (o1 instanceof ByteBuffer && o2 instanceof ByteBuffer) { + ByteBuffer buf1 = (ByteBuffer) o1; + ByteBuffer buf2 = (ByteBuffer) o2; + return Integer.compare( + BloomKFilter.getNumSetBits(buf1, buf1.position()), + BloomKFilter.getNumSetBits(buf2, buf2.position()) + ); + } else if (o1 instanceof BloomKFilter && o2 instanceof BloomKFilter) { + BloomKFilter o1f = (BloomKFilter) o1; + BloomKFilter o2f = (BloomKFilter) o2; + return Integer.compare(o1f.getNumSetBits(), o2f.getNumSetBits()); + } else { + throw new RE("Unable to compare unexpected types [%s]", o1.getClass().getName()); + } + }); + } + + @Override + public Object combine(@Nullable Object lhs, @Nullable Object rhs) + { + if (rhs == null) { + return lhs; + } + if (lhs == null) { + return rhs; + } + if (rhs instanceof BloomKFilter) { + ((BloomKFilter) lhs).merge((BloomKFilter) rhs); + return lhs; + } else { + ByteBuffer buf = (ByteBuffer) lhs; + ByteBuffer other = (ByteBuffer) rhs; + BloomKFilter.mergeBloomFilterByteBuffers(buf, buf.position(), other, other.position()); + return lhs; + } + } + + @Override + public AggregatorFactory getCombiningFactory() + { + return new BloomFilterMergeAggregatorFactory(name, name, maxNumEntries); + } + + @Override + public List<AggregatorFactory> getRequiredColumns() + { + return Collections.singletonList(new BloomFilterAggregatorFactory(name, field, maxNumEntries)); + } + + @Override + public Object deserialize(Object object) + { + if (object instanceof String) { + return ByteBuffer.wrap(Base64.decodeBase64(StringUtils.toUtf8((String) object))); + } else { + return object; + } + } + + @Override + public Object finalizeComputation(Object object) + { + try { + if (object instanceof ByteBuffer) { + return BloomKFilter.deserialize((ByteBuffer) object); + } else if (object instanceof byte[]) { + return BloomKFilter.deserialize(ByteBuffer.wrap((byte[]) object)); + } else { + return object; + } + } + catch (IOException ioe) { + throw new RuntimeException("Failed to deserialize BloomKFilter"); Review comment: `, ioe` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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