/*
* 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.Session;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.metadata.TableHandle;
import com.facebook.presto.metadata.TableLayoutHandle;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PageBuilder;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.sql.planner.plan.PlanNodeId;
import com.google.common.collect.ImmutableList;
import java.util.List;
import java.util.OptionalLong;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class MetadataDeleteOperator
implements Operator
{
public static final List<Type> TYPES = ImmutableList.of(BIGINT);
public static class MetadataDeleteOperatorFactory
implements OperatorFactory
{
private final int operatorId;
private final PlanNodeId planNodeId;
private final TableLayoutHandle tableLayout;
private final Metadata metadata;
private final Session session;
private final TableHandle tableHandle;
private boolean closed;
public MetadataDeleteOperatorFactory(int operatorId, PlanNodeId planNodeId, TableLayoutHandle tableLayout, Metadata metadata, Session session, TableHandle tableHandle)
{
this.operatorId = operatorId;
this.planNodeId = requireNonNull(planNodeId, "planNodeId is null");
this.tableLayout = requireNonNull(tableLayout, "tableLayout is null");
this.metadata = requireNonNull(metadata, "metadata is null");
this.session = requireNonNull(session, "session is null");
this.tableHandle = requireNonNull(tableHandle, "tableHandle is null");
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public Operator createOperator(DriverContext driverContext)
{
checkState(!closed, "Factory is already closed");
OperatorContext context = driverContext.addOperatorContext(operatorId, planNodeId, MetadataDeleteOperator.class.getSimpleName());
return new MetadataDeleteOperator(context, tableLayout, metadata, session, tableHandle);
}
@Override
public void close()
{
closed = true;
}
@Override
public OperatorFactory duplicate()
{
return new MetadataDeleteOperatorFactory(operatorId, planNodeId, tableLayout, metadata, session, tableHandle);
}
}
private final OperatorContext operatorContext;
private final TableLayoutHandle tableLayout;
private final Metadata metadata;
private final Session session;
private final TableHandle tableHandle;
private boolean finished;
public MetadataDeleteOperator(OperatorContext operatorContext, TableLayoutHandle tableLayout, Metadata metadata, Session session, TableHandle tableHandle)
{
this.operatorContext = requireNonNull(operatorContext, "operatorContext is null");
this.tableLayout = requireNonNull(tableLayout, "tableLayout is null");
this.metadata = requireNonNull(metadata, "metadata is null");
this.session = requireNonNull(session, "session is null");
this.tableHandle = requireNonNull(tableHandle, "tableHandle is null");
}
@Override
public OperatorContext getOperatorContext()
{
return operatorContext;
}
@Override
public List<Type> getTypes()
{
return TYPES;
}
@Override
public void finish()
{
}
@Override
public boolean isFinished()
{
return finished;
}
@Override
public boolean needsInput()
{
return false;
}
@Override
public void addInput(Page page)
{
throw new UnsupportedOperationException();
}
@Override
public Page getOutput()
{
if (finished) {
return null;
}
finished = true;
OptionalLong rowsDeletedCount = metadata.metadataDelete(session, tableHandle, tableLayout);
PageBuilder page = new PageBuilder(TYPES);
BlockBuilder rowsBuilder = page.getBlockBuilder(0);
page.declarePosition();
if (rowsDeletedCount.isPresent()) {
BIGINT.writeLong(rowsBuilder, rowsDeletedCount.getAsLong());
}
else {
rowsBuilder.appendNull();
}
return page.build();
}
}