/*
* 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.block.Block;
import com.facebook.presto.tuple.TupleInfo;
import com.google.common.collect.ImmutableList;
import com.google.common.primitives.Ints;
import com.google.common.util.concurrent.ListenableFuture;
import java.util.Collection;
import java.util.List;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
public class MarkDistinctOperator
implements Operator
{
private final OperatorContext operatorContext;
public static class MarkDistinctOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final int[] markDistinctChannels;
private final List<TupleInfo> tupleInfos;
private boolean closed;
public MarkDistinctOperatorFactory(int operatorId, List<TupleInfo> sourceTupleInfos, Collection<Integer> markDistinctChannels)
{
this.operatorId = operatorId;
checkNotNull(markDistinctChannels, "markDistinctChannels is null");
checkArgument(!markDistinctChannels.isEmpty(), "markDistinctChannels is empty");
this.markDistinctChannels = Ints.toArray(markDistinctChannels);
this.tupleInfos = ImmutableList.<TupleInfo>builder()
.addAll(sourceTupleInfos)
.add(TupleInfo.SINGLE_BOOLEAN)
.build();
}
@Override
public List<TupleInfo> getTupleInfos()
{
return tupleInfos;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext operatorContext = driverContext.addOperatorContext(operatorId, MarkDistinctOperator.class.getSimpleName());
return new MarkDistinctOperator(operatorContext, tupleInfos, markDistinctChannels);
}
@Override
public void close()
{
closed = true;
}
}
private final List<TupleInfo> tupleInfos;
private final MarkDistinctHash markDistinctHash;
private Page outputPage;
private boolean finishing;
public MarkDistinctOperator(OperatorContext operatorContext, List<TupleInfo> tupleInfos, int[] markDistinctChannels)
{
this.operatorContext = checkNotNull(operatorContext, "operatorContext is null");
checkNotNull(tupleInfos, "tupleInfos is null");
checkArgument(markDistinctChannels.length >= 0, "markDistinctChannels is empty");
ImmutableList.Builder<TupleInfo.Type> types = ImmutableList.builder();
for (int channel : markDistinctChannels) {
types.add(tupleInfos.get(channel).getType());
}
this.markDistinctHash = new MarkDistinctHash(types.build(), markDistinctChannels);
this.tupleInfos = tupleInfos;
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<TupleInfo> getTupleInfos()
{
return tupleInfos;
}
@Override
public void finish()
{
finishing = true;
}
@Override
public boolean isFinished()
{
return finishing && outputPage == null;
}
@Override
public ListenableFuture<?> isBlocked()
{
return NOT_BLOCKED;
}
@Override
public boolean needsInput()
{
operatorContext.setMemoryReservation(markDistinctHash.getEstimatedSize());
if (finishing || outputPage != null) {
return false;
}
return true;
}
@Override
public void addInput(Page page)
{
checkNotNull(page, "page is null");
checkState(!finishing, "Operator is finishing");
checkState(outputPage == null, "Operator still has pending output");
operatorContext.setMemoryReservation(markDistinctHash.getEstimatedSize());
Block markerBlock = markDistinctHash.markDistinctRows(page);
// add the new boolean column to the page
Block[] sourceBlocks = page.getBlocks();
Block[] outputBlocks = new Block[sourceBlocks.length + 1]; // +1 for the single boolean output channel
System.arraycopy(sourceBlocks, 0, outputBlocks, 0, sourceBlocks.length);
outputBlocks[sourceBlocks.length] = markerBlock;
outputPage = new Page(outputBlocks);
}
@Override
public Page getOutput()
{
Page result = outputPage;
outputPage = null;
return result;
}
}