/*
* 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.sql.planner.plan;
import com.facebook.presto.spi.block.SortOrder;
import com.facebook.presto.sql.planner.Symbol;
import com.facebook.presto.sql.planner.plan.WindowNode.Specification;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import javax.annotation.concurrent.Immutable;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.Iterables.concat;
import static java.util.Objects.requireNonNull;
@Immutable
public final class TopNRowNumberNode
extends PlanNode
{
private final PlanNode source;
private final Specification specification;
private final Symbol rowNumberSymbol;
private final int maxRowCountPerPartition;
private final boolean partial;
private final Optional<Symbol> hashSymbol;
@JsonCreator
public TopNRowNumberNode(
@JsonProperty("id") PlanNodeId id,
@JsonProperty("source") PlanNode source,
@JsonProperty("specification") Specification specification,
@JsonProperty("rowNumberSymbol") Symbol rowNumberSymbol,
@JsonProperty("maxRowCountPerPartition") int maxRowCountPerPartition,
@JsonProperty("partial") boolean partial,
@JsonProperty("hashSymbol") Optional<Symbol> hashSymbol)
{
super(id);
requireNonNull(source, "source is null");
requireNonNull(specification, "specification is null");
requireNonNull(rowNumberSymbol, "rowNumberSymbol is null");
checkArgument(maxRowCountPerPartition > 0, "maxRowCountPerPartition must be > 0");
requireNonNull(hashSymbol, "hashSymbol is null");
this.source = source;
this.specification = specification;
this.rowNumberSymbol = rowNumberSymbol;
this.maxRowCountPerPartition = maxRowCountPerPartition;
this.partial = partial;
this.hashSymbol = hashSymbol;
}
@Override
public List<PlanNode> getSources()
{
return ImmutableList.of(source);
}
@Override
public List<Symbol> getOutputSymbols()
{
if (!partial) {
return ImmutableList.copyOf(concat(source.getOutputSymbols(), ImmutableList.of(rowNumberSymbol)));
}
return ImmutableList.copyOf(source.getOutputSymbols());
}
@JsonProperty
public PlanNode getSource()
{
return source;
}
@JsonProperty
public Specification getSpecification()
{
return specification;
}
public List<Symbol> getPartitionBy()
{
return specification.getPartitionBy();
}
public List<Symbol> getOrderBy()
{
return specification.getOrderBy();
}
public Map<Symbol, SortOrder> getOrderings()
{
return specification.getOrderings();
}
@JsonProperty
public Symbol getRowNumberSymbol()
{
return rowNumberSymbol;
}
@JsonProperty
public int getMaxRowCountPerPartition()
{
return maxRowCountPerPartition;
}
@JsonProperty
public boolean isPartial()
{
return partial;
}
@JsonProperty
public Optional<Symbol> getHashSymbol()
{
return hashSymbol;
}
@Override
public <C, R> R accept(PlanVisitor<C, R> visitor, C context)
{
return visitor.visitTopNRowNumber(this, context);
}
@Override
public PlanNode replaceChildren(List<PlanNode> newChildren)
{
return new TopNRowNumberNode(getId(), Iterables.getOnlyElement(newChildren), specification, rowNumberSymbol, maxRowCountPerPartition, partial, hashSymbol);
}
}