FrankChen021 commented on a change in pull request #10949: URL: https://github.com/apache/druid/pull/10949#discussion_r611058889
########## File path: processing/src/main/java/org/apache/druid/query/aggregation/AbstractSerializablePairSerde.java ########## @@ -0,0 +1,116 @@ +/* + * 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.google.common.primitives.Longs; +import org.apache.druid.collections.SerializablePair; +import org.apache.druid.data.input.InputRow; +import org.apache.druid.segment.GenericColumnSerializer; +import org.apache.druid.segment.column.ColumnBuilder; +import org.apache.druid.segment.data.GenericIndexed; +import org.apache.druid.segment.data.ObjectStrategy; +import org.apache.druid.segment.serde.ComplexColumnPartSupplier; +import org.apache.druid.segment.serde.ComplexMetricExtractor; +import org.apache.druid.segment.serde.ComplexMetricSerde; +import org.apache.druid.segment.serde.LargeColumnSupportedComplexColumnSerializer; +import org.apache.druid.segment.writeout.SegmentWriteOutMedium; + +import javax.annotation.Nullable; +import java.nio.ByteBuffer; + +/** + * The class serializes a Pair<Long, ?> object for double/float/longFirst and double/float/longLast aggregators + */ +public abstract class AbstractSerializablePairSerde<T extends SerializablePair<Long, ?>> extends ComplexMetricSerde +{ + private final Class<T> pairClassObject; + + public AbstractSerializablePairSerde(Class<T> pairClassObject) + { + this.pairClassObject = pairClassObject; + } + + @Override + public ComplexMetricExtractor getExtractor() + { + return new ComplexMetricExtractor() + { + @Override + public Class<T> extractedClass() + { + return pairClassObject; + } + + @Override + public Object extractValue(InputRow inputRow, String metricName) + { + return inputRow.getRaw(metricName); + } + }; + } + + @Override + public void deserializeColumn(ByteBuffer buffer, ColumnBuilder columnBuilder) + { + final GenericIndexed column = GenericIndexed.read(buffer, getObjectStrategy(), columnBuilder.getFileMapper()); + columnBuilder.setComplexColumnSupplier(new ComplexColumnPartSupplier(getTypeName(), column)); + } + + @Override + public ObjectStrategy<T> getObjectStrategy() + { + return new ObjectStrategy<T>() + { + @Override + public int compare(@Nullable T o1, @Nullable T o2) + { + return Longs.compare(o1.lhs, o2.lhs); + } + + @Override + public Class<T> getClazz() + { + return pairClassObject; + } + + @Override + public T fromByteBuffer(ByteBuffer buffer, int numBytes) + { + return toPairObject(buffer); + } + + @Override + public byte[] toBytes(T val) + { + return pairToBytes(val); + } + }; + } + + @Override + public GenericColumnSerializer<T> getSerializer(SegmentWriteOutMedium segmentWriteOutMedium, String column) + { + return LargeColumnSupportedComplexColumnSerializer.create(segmentWriteOutMedium, column, this.getObjectStrategy()); + } + + protected abstract T toPairObject(ByteBuffer buffer); + + protected abstract byte[] pairToBytes(T val); Review comment: In the new commit, null check is added to the caller of this method, so it's not necessary to declare this parameter as `Nullable` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
