| /* |
| * 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.firstlast.first; |
| |
| import org.apache.druid.collections.SerializablePair; |
| import org.apache.druid.common.config.NullHandling; |
| import org.apache.druid.query.aggregation.BufferAggregator; |
| import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector; |
| import org.apache.druid.segment.BaseLongColumnValueSelector; |
| import org.apache.druid.segment.ColumnValueSelector; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Base type for buffer based 'first' aggregator for primitive numeric column selectors |
| */ |
| public abstract class NumericFirstBufferAggregator implements BufferAggregator |
| { |
| static final int NULL_OFFSET = Long.BYTES; |
| static final int VALUE_OFFSET = NULL_OFFSET + Byte.BYTES; |
| |
| private final boolean useDefault = NullHandling.replaceWithDefault(); |
| private final BaseLongColumnValueSelector timeSelector; |
| private final boolean needsFoldCheck; |
| |
| final ColumnValueSelector valueSelector; |
| |
| public NumericFirstBufferAggregator(BaseLongColumnValueSelector timeSelector, ColumnValueSelector valueSelector, boolean needsFoldCheck) |
| { |
| this.timeSelector = timeSelector; |
| this.valueSelector = valueSelector; |
| this.needsFoldCheck = needsFoldCheck; |
| } |
| |
| /** |
| * Initialize the buffer value at the position of {@link #VALUE_OFFSET} |
| */ |
| abstract void initValue(ByteBuffer buf, int position); |
| |
| /** |
| * Place the primitive value in the buffer at the position of {@link #VALUE_OFFSET} |
| */ |
| abstract void putValue(ByteBuffer buf, int position, ColumnValueSelector valueSector); |
| |
| abstract void putValue(ByteBuffer buf, int position, Number value); |
| |
| void updateTimeWithValue(ByteBuffer buf, int position, long time, ColumnValueSelector valueSelector) |
| { |
| buf.putLong(position, time); |
| buf.put(position + NULL_OFFSET, NullHandling.IS_NOT_NULL_BYTE); |
| putValue(buf, position + VALUE_OFFSET, valueSelector); |
| } |
| |
| void updateTimeWithValue(ByteBuffer buf, int position, long time, Number value) |
| { |
| buf.putLong(position, time); |
| buf.put(position + NULL_OFFSET, NullHandling.IS_NOT_NULL_BYTE); |
| putValue(buf, position + VALUE_OFFSET, value); |
| } |
| |
| void updateTimeWithNull(ByteBuffer buf, int position, long time) |
| { |
| buf.putLong(position, time); |
| buf.put(position + NULL_OFFSET, NullHandling.IS_NULL_BYTE); |
| } |
| |
| boolean isValueNull(ByteBuffer buf, int position) |
| { |
| return buf.get(position + NULL_OFFSET) == NullHandling.IS_NULL_BYTE; |
| } |
| |
| @Override |
| public void init(ByteBuffer buf, int position) |
| { |
| buf.putLong(position, Long.MAX_VALUE); |
| buf.put(position + NULL_OFFSET, useDefault ? NullHandling.IS_NOT_NULL_BYTE : NullHandling.IS_NULL_BYTE); |
| initValue(buf, position + VALUE_OFFSET); |
| } |
| |
| @Override |
| public void aggregate(ByteBuffer buf, int position) |
| { |
| long firstTime = buf.getLong(position); |
| if (needsFoldCheck) { |
| final Object object = valueSelector.getObject(); |
| if (object instanceof SerializablePair) { |
| final SerializablePair<Long, Number> inPair = (SerializablePair<Long, Number>) object; |
| if (inPair.lhs < firstTime) { |
| if (inPair.rhs == null) { |
| updateTimeWithNull(buf, position, inPair.lhs); |
| } else { |
| updateTimeWithValue(buf, position, inPair.lhs, inPair.rhs); |
| } |
| } |
| return; |
| } |
| } |
| |
| if (timeSelector.isNull()) { |
| return; |
| } |
| |
| long time = timeSelector.getLong(); |
| |
| if (time < firstTime) { |
| if (useDefault || !valueSelector.isNull()) { |
| updateTimeWithValue(buf, position, time, valueSelector); |
| } else { |
| updateTimeWithNull(buf, position, time); |
| } |
| } |
| } |
| |
| @Override |
| public void close() |
| { |
| // no resources to cleanup |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("timeSelector", timeSelector); |
| inspector.visit("valueSelector", valueSelector); |
| } |
| } |