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204 changes: 204 additions & 0 deletions
204
processing/src/main/java/org/apache/druid/frame/field/NumericArrayFieldSelector.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.druid.frame.field; | ||
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| import org.apache.datasketches.memory.Memory; | ||
| import org.apache.druid.error.DruidException; | ||
| import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector; | ||
| import org.apache.druid.segment.ColumnValueSelector; | ||
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| import javax.annotation.Nullable; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| /** | ||
| * Base implementation of the column value selector that the concrete numeric field reader implementations inherit from. | ||
| * The selector contains the logic to construct an array written by {@link NumericArrayFieldWriter}, and present it as | ||
| * a column value selector. | ||
| * | ||
| * The inheritors of this class are expected to implement | ||
| * 1. {@link #getIndividualValueAtMemory} Which extracts the element from the field where it was written to. Returns | ||
| * null if the value at that location represents a null element | ||
| * 2. {@link #getIndividualFieldSize} Which informs the method about the field size corresponding to each element in | ||
| * the numeric array's serialized representation | ||
| * | ||
| * @param <ElementType> Type of the individual array elements | ||
| */ | ||
| public abstract class NumericArrayFieldSelector<ElementType extends Number> implements ColumnValueSelector | ||
| { | ||
| /** | ||
| * Memory containing the serialized values of the array | ||
| */ | ||
| private final Memory memory; | ||
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| /** | ||
| * Pointer to location in the memory. The callers are expected to update the pointer's position to the start of the | ||
| * array that they wish to get prior to {@link #getObject()} call. | ||
| * | ||
| * Frames read and written using {@link org.apache.druid.frame.write.FrameWriter} and | ||
| * {@link org.apache.druid.frame.read.FrameReader} shouldn't worry about this detail, since they automatically update | ||
| * and handle the start location | ||
| */ | ||
| private final ReadableFieldPointer fieldPointer; | ||
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| /** | ||
| * Position last read, for caching the last fetched result | ||
| */ | ||
| private long currentFieldPosition = -1; | ||
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| /** | ||
| * Value of the row at the location beginning at {@link #currentFieldPosition} | ||
| */ | ||
| private final List<ElementType> currentRow = new ArrayList<>(); | ||
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| /** | ||
| * Nullity of the row at the location beginning at {@link #currentFieldPosition} | ||
| */ | ||
| private boolean currentRowIsNull; | ||
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| public NumericArrayFieldSelector(final Memory memory, final ReadableFieldPointer fieldPointer) | ||
| { | ||
| this.memory = memory; | ||
| this.fieldPointer = fieldPointer; | ||
| } | ||
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| @Override | ||
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) | ||
| { | ||
| // Do nothing | ||
| } | ||
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| @Nullable | ||
| @Override | ||
| public Object getObject() | ||
| { | ||
| final List<ElementType> currentArray = computeCurrentArray(); | ||
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| if (currentArray == null) { | ||
| return null; | ||
| } | ||
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| return currentArray.toArray(); | ||
| } | ||
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| @Override | ||
| public Class classOfObject() | ||
| { | ||
| return Object.class; | ||
| } | ||
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| @Override | ||
| public double getDouble() | ||
| { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public float getFloat() | ||
| { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public long getLong() | ||
| { | ||
| return 0; | ||
| } | ||
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| @Override | ||
| public boolean isNull() | ||
| { | ||
| long position = fieldPointer.position(); | ||
| final byte firstByte = memory.getByte(position); | ||
| return firstByte == NumericArrayFieldWriter.NULL_ROW; | ||
| } | ||
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| /** | ||
| * Returns the value of the individual element written at the given position | ||
| */ | ||
| @Nullable | ||
| public abstract ElementType getIndividualValueAtMemory(Memory memory, long position); | ||
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| /** | ||
| * Returns the field size that each element in the reader array consumes. It is usually 1 + ElementType.SIZE, to hold | ||
| * the element's nullity, and it's representation. | ||
| */ | ||
| public abstract int getIndividualFieldSize(); | ||
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| @Nullable | ||
| private List<ElementType> computeCurrentArray() | ||
| { | ||
| final long fieldPosition = fieldPointer.position(); | ||
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| if (fieldPosition != currentFieldPosition) { | ||
| updateCurrentArray(fieldPosition); | ||
| } | ||
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| this.currentFieldPosition = fieldPosition; | ||
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| if (currentRowIsNull) { | ||
| return null; | ||
| } | ||
| return currentRow; | ||
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| } | ||
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| private void updateCurrentArray(final long fieldPosition) | ||
| { | ||
| currentRow.clear(); | ||
| currentRowIsNull = false; | ||
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| long position = fieldPosition; | ||
| long limit = memory.getCapacity(); | ||
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| // Check the first byte, and if it is null, update the current value to null and return | ||
| if (isNull()) { | ||
| currentRowIsNull = true; | ||
| return; | ||
| } | ||
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| // Adding a check here to prevent the position from potentially overflowing | ||
| if (position < limit) { | ||
| position++; | ||
| } | ||
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| // Sanity check, to make sure that we see the rowTerminator at the end | ||
| boolean rowTerminatorSeen = false; | ||
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| while (position < limit) { | ||
| final byte kind = memory.getByte(position); | ||
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| // Break as soon as we see the ARRAY_TERMINATOR (0x00) | ||
| if (kind == NumericArrayFieldWriter.ARRAY_TERMINATOR) { | ||
| rowTerminatorSeen = true; | ||
| break; | ||
| } | ||
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| // If terminator not seen, then read the field at that location, and increment the position by the element's field | ||
| // size to read the next element. | ||
| currentRow.add(getIndividualValueAtMemory(memory, position)); | ||
| position += getIndividualFieldSize(); | ||
| } | ||
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| if (!rowTerminatorSeen) { | ||
| throw DruidException.defensive("Unexpected end of field"); | ||
| } | ||
| } | ||
| } |
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