com.facebook.presto.jdbc.internal.common.block.RowBlockEncoding Maven / Gradle / Ivy
/*
* 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.jdbc.internal.common.block;
import com.facebook.presto.jdbc.internal.io.airlift.slice.SliceInput;
import com.facebook.presto.jdbc.internal.io.airlift.slice.SliceOutput;
import static com.facebook.presto.jdbc.internal.common.block.RowBlock.createRowBlockInternal;
import static com.facebook.presto.jdbc.internal.io.airlift.slice.Slices.wrappedIntArray;
public class RowBlockEncoding
implements BlockEncoding
{
public static final String NAME = "ROW";
@Override
public String getName()
{
return NAME;
}
@Override
public void writeBlock(BlockEncodingSerde blockEncodingSerde, SliceOutput sliceOutput, Block block)
{
AbstractRowBlock rowBlock = (AbstractRowBlock) block;
int numFields = rowBlock.numFields;
int positionCount = rowBlock.getPositionCount();
int offsetBase = rowBlock.getOffsetBase();
int[] fieldBlockOffsets = rowBlock.getFieldBlockOffsets();
int startFieldBlockOffset = fieldBlockOffsets[offsetBase];
int endFieldBlockOffset = fieldBlockOffsets[offsetBase + positionCount];
sliceOutput.appendInt(numFields);
for (int i = 0; i < numFields; i++) {
blockEncodingSerde.writeBlock(sliceOutput, rowBlock.getRawFieldBlocks()[i].getRegion(startFieldBlockOffset, endFieldBlockOffset - startFieldBlockOffset));
}
sliceOutput.appendInt(positionCount);
for (int position = 0; position < positionCount + 1; position++) {
sliceOutput.writeInt(fieldBlockOffsets[offsetBase + position] - startFieldBlockOffset);
}
EncoderUtil.encodeNullsAsBits(sliceOutput, block);
}
@Override
public Block readBlock(BlockEncodingSerde blockEncodingSerde, SliceInput sliceInput)
{
int numFields = sliceInput.readInt();
Block[] fieldBlocks = new Block[numFields];
for (int i = 0; i < numFields; i++) {
fieldBlocks[i] = blockEncodingSerde.readBlock(sliceInput);
}
int positionCount = sliceInput.readInt();
int[] fieldBlockOffsets = new int[positionCount + 1];
sliceInput.readBytes(wrappedIntArray(fieldBlockOffsets));
boolean[] rowIsNull = EncoderUtil.decodeNullBits(sliceInput, positionCount).orElse(null);
return createRowBlockInternal(0, positionCount, rowIsNull, fieldBlockOffsets, fieldBlocks);
}
}
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