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/*
* Licensed 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 com.facebook.presto.common.block;
import org.openjdk.jol.info.ClassLayout;
import static io.airlift.slice.SizeOf.sizeOf;
import static java.util.Objects.requireNonNull;
public class ColumnarArray
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(ColumnarArray.class).instanceSize();
private final Block nullCheckBlock;
private final int offsetsOffset;
private final int[] offsets;
private final Block elementsBlock;
private final long retainedSizeInBytes;
private final long estimatedSerializedSizeInBytes;
public static ColumnarArray toColumnarArray(Block block)
{
requireNonNull(block, "block is null");
if (block instanceof DictionaryBlock) {
return toColumnarArray((DictionaryBlock) block);
}
if (block instanceof RunLengthEncodedBlock) {
return toColumnarArray((RunLengthEncodedBlock) block);
}
if (!(block instanceof AbstractArrayBlock)) {
throw new IllegalArgumentException("Invalid array block: " + block.getClass().getName());
}
AbstractArrayBlock arrayBlock = (AbstractArrayBlock) block;
Block elementsBlock = arrayBlock.getRawElementBlock();
// trim elements to just visible region
int elementsOffset = 0;
int elementsLength = 0;
if (arrayBlock.getPositionCount() > 0) {
elementsOffset = arrayBlock.getOffset(0);
elementsLength = arrayBlock.getOffset(arrayBlock.getPositionCount()) - elementsOffset;
}
elementsBlock = elementsBlock.getRegion(elementsOffset, elementsLength);
return new ColumnarArray(
block,
arrayBlock.getOffsetBase(),
arrayBlock.getOffsets(),
elementsBlock,
INSTANCE_SIZE + block.getRetainedSizeInBytes(),
block.getSizeInBytes());
}
private static ColumnarArray toColumnarArray(DictionaryBlock dictionaryBlock)
{
ColumnarArray columnarArray = toColumnarArray(dictionaryBlock.getDictionary());
int positionCount = dictionaryBlock.getPositionCount();
// build new offsets
int[] offsets = new int[positionCount + 1];
for (int position = 0; position < positionCount; position++) {
int dictionaryId = dictionaryBlock.getId(position);
offsets[position + 1] = offsets[position] + columnarArray.getLength(dictionaryId);
}
// reindex dictionary
int[] dictionaryIds = new int[offsets[positionCount]];
int nextDictionaryIndex = 0;
for (int position = 0; position < positionCount; position++) {
int dictionaryId = dictionaryBlock.getId(position);
int length = columnarArray.getLength(dictionaryId);
int startOffset = columnarArray.getOffset(dictionaryId);
for (int entryIndex = 0; entryIndex < length; entryIndex++) {
dictionaryIds[nextDictionaryIndex] = startOffset + entryIndex;
nextDictionaryIndex++;
}
}
Block elementsBlock = columnarArray.getElementsBlock();
return new ColumnarArray(
dictionaryBlock,
0,
offsets,
new DictionaryBlock(dictionaryIds.length, elementsBlock, dictionaryIds),
INSTANCE_SIZE + dictionaryBlock.getRetainedSizeInBytes() + sizeOf(offsets) + sizeOf(dictionaryIds),
// The estimated serialized size is the sum of the following
// 1) the offsets size: Integer.BYTES * positionCount
// 2) nulls array size: Byte.BYTES * positionCount
// 3) the estimated serialized size for the elementsBlock which was just constructed as a new DictionaryBlock:
// the average row size: elementsBlock.getSizeInBytes() / (double) elementsBlock.getPositionCount() * the number of rows: offsets[positionCount]
(Integer.BYTES + Byte.BYTES) * positionCount + elementsBlock.getPositionCount() == 0 ? 0 : (long) (elementsBlock.getSizeInBytes() / (double) elementsBlock.getPositionCount() * offsets[positionCount]));
}
private static ColumnarArray toColumnarArray(RunLengthEncodedBlock rleBlock)
{
ColumnarArray columnarArray = toColumnarArray(rleBlock.getValue());
int positionCount = rleBlock.getPositionCount();
// build new offsets block
int[] offsets = new int[positionCount + 1];
int valueLength = columnarArray.getLength(0);
for (int i = 0; i < offsets.length; i++) {
offsets[i] = i * valueLength;
}
// create indexes for a dictionary block of the elements
int[] dictionaryIds = new int[positionCount * valueLength];
int nextDictionaryIndex = 0;
for (int position = 0; position < positionCount; position++) {
for (int entryIndex = 0; entryIndex < valueLength; entryIndex++) {
dictionaryIds[nextDictionaryIndex] = entryIndex;
nextDictionaryIndex++;
}
}
Block elementsBlock = columnarArray.getElementsBlock();
return new ColumnarArray(
rleBlock,
0,
offsets,
new DictionaryBlock(dictionaryIds.length, elementsBlock, dictionaryIds),
INSTANCE_SIZE + rleBlock.getRetainedSizeInBytes() + sizeOf(offsets) + sizeOf(dictionaryIds),
// The estimated serialized size is the sum of the following
// 1) the offsets size: Integer.BYTES * positionCount
// 2) nulls array size: Byte.BYTES * positionCount
// 3) the estimated serialized size for the elementsBlock which was just constructed as a new DictionaryBlock:
// the average row size: elementsBlock.getSizeInBytes() / (double) elementsBlock.getPositionCount() * the number of rows: offsets[positionCount]
(Integer.BYTES + Byte.BYTES) * positionCount + (long) (elementsBlock.getSizeInBytes() / (double) elementsBlock.getPositionCount() * offsets[positionCount]));
}
private ColumnarArray(Block nullCheckBlock, int offsetsOffset, int[] offsets, Block elementsBlock, long retainedSizeInBytes, long estimatedSerializedSizeInBytes)
{
this.nullCheckBlock = nullCheckBlock;
this.offsetsOffset = offsetsOffset;
this.offsets = offsets;
this.elementsBlock = elementsBlock;
this.retainedSizeInBytes = retainedSizeInBytes;
this.estimatedSerializedSizeInBytes = estimatedSerializedSizeInBytes;
}
public int getPositionCount()
{
return nullCheckBlock.getPositionCount();
}
public boolean isNull(int position)
{
return nullCheckBlock.isNull(position);
}
public int getLength(int position)
{
return (offsets[position + 1 + offsetsOffset] - offsets[position + offsetsOffset]);
}
public int getOffset(int position)
{
return (offsets[position + offsetsOffset] - offsets[offsetsOffset]);
}
public Block getElementsBlock()
{
return elementsBlock;
}
public Block getNullCheckBlock()
{
return nullCheckBlock;
}
public long getRetainedSizeInBytes()
{
return retainedSizeInBytes;
}
public long getEstimatedSerializedSizeInBytes()
{
return estimatedSerializedSizeInBytes;
}
@Override
public String toString()
{
StringBuilder sb = new StringBuilder(getClass().getSimpleName()).append("{");
sb.append("positionCount=").append(getPositionCount()).append(",");
sb.append("offsetsOffset=").append(offsetsOffset).append(",");
sb.append("nullCheckBlock=").append(nullCheckBlock.toString()).append(",");
sb.append("elementsBlock=").append(elementsBlock.toString()).append(",");
sb.append('}');
return sb.toString();
}
}
