/*
* 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.operator;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PageBuilder;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.Type;
import java.util.List;
import java.util.Optional;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
public class SimpleJoinProbe
implements JoinProbe
{
public static class SimpleJoinProbeFactory
implements JoinProbeFactory
{
private List<Type> types;
private List<Integer> probeOutputChannels;
private List<Integer> probeJoinChannels;
private final Optional<Integer> probeHashChannel;
public SimpleJoinProbeFactory(List<Type> types, List<Integer> probeOutputChannels, List<Integer> probeJoinChannels, Optional<Integer> probeHashChannel)
{
this.types = types;
this.probeOutputChannels = probeOutputChannels;
this.probeJoinChannels = probeJoinChannels;
this.probeHashChannel = probeHashChannel;
}
@Override
public JoinProbe createJoinProbe(LookupSource lookupSource, Page page)
{
return new SimpleJoinProbe(types, probeOutputChannels, lookupSource, page, probeJoinChannels, probeHashChannel);
}
}
private final List<Type> types;
private final List<Integer> probeOutputChannels;
private final LookupSource lookupSource;
private final int positionCount;
private final Block[] blocks;
private final Block[] probeBlocks;
private final Page page;
private final Page probePage;
private final Optional<Block> probeHashBlock;
private int position = -1;
private SimpleJoinProbe(List<Type> types, List<Integer> probeOutputChannels, LookupSource lookupSource, Page page, List<Integer> probeJoinChannels, Optional<Integer> hashChannel)
{
this.types = types;
this.probeOutputChannels = probeOutputChannels;
this.lookupSource = lookupSource;
this.positionCount = page.getPositionCount();
this.blocks = new Block[page.getChannelCount()];
this.probeBlocks = new Block[probeJoinChannels.size()];
for (int i = 0; i < page.getChannelCount(); i++) {
blocks[i] = page.getBlock(i);
}
for (int i = 0; i < probeJoinChannels.size(); i++) {
probeBlocks[i] = blocks[probeJoinChannels.get(i)];
}
this.page = page;
this.probePage = new Page(page.getPositionCount(), probeBlocks);
this.probeHashBlock = hashChannel.isPresent() ? Optional.of(page.getBlock(hashChannel.get())) : Optional.empty();
}
@Override
public int getOutputChannelCount()
{
return probeOutputChannels.size();
}
@Override
public boolean advanceNextPosition()
{
position++;
return position < positionCount;
}
@Override
public void appendTo(PageBuilder pageBuilder)
{
int pageBuilderOutputChannel = 0;
for (int outputIndex : probeOutputChannels) {
Type type = types.get(outputIndex);
Block block = blocks[outputIndex];
type.appendTo(block, position, pageBuilder.getBlockBuilder(pageBuilderOutputChannel++));
}
}
@Override
public long getCurrentJoinPosition()
{
if (currentRowContainsNull()) {
return -1;
}
if (probeHashBlock.isPresent()) {
long rawHash = BIGINT.getLong(probeHashBlock.get(), position);
return lookupSource.getJoinPosition(position, probePage, page, rawHash);
}
return lookupSource.getJoinPosition(position, probePage, page);
}
private boolean currentRowContainsNull()
{
for (Block probeBlock : probeBlocks) {
if (probeBlock.isNull(position)) {
return true;
}
}
return false;
}
@Override
public int getPosition()
{
return position;
}
@Override
public Page getPage()
{
return page;
}
}