com.facebook.presto.jdbc.internal.spi.plan.MarkDistinctNode 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.spi.plan;
import com.facebook.presto.jdbc.internal.spi.SourceLocation;
import com.facebook.presto.jdbc.internal.spi.relation.VariableReferenceExpression;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonCreator;
import com.facebook.presto.jdbc.internal.jackson.annotation.JsonProperty;
import com.facebook.presto.jdbc.internal.javax.annotation.concurrent.Immutable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import static java.util.Collections.unmodifiableList;
import static java.util.Objects.requireNonNull;
@Immutable
public final class MarkDistinctNode
extends PlanNode
{
private final PlanNode source;
private final VariableReferenceExpression markerVariable;
private final Optional hashVariable;
private final List distinctVariables;
private final List output;
@JsonCreator
public MarkDistinctNode(
Optional sourceLocation,
@JsonProperty("id") PlanNodeId id,
@JsonProperty("source") PlanNode source,
@JsonProperty("markerVariable") VariableReferenceExpression markerVariable,
@JsonProperty("distinctVariables") List distinctVariables,
@JsonProperty("hashVariable") Optional hashVariable)
{
this(sourceLocation, id, Optional.empty(), source, markerVariable, distinctVariables, hashVariable);
}
public MarkDistinctNode(
Optional sourceLocation,
PlanNodeId id,
Optional statsEquivalentPlanNode,
PlanNode source,
VariableReferenceExpression markerVariable,
List distinctVariables,
Optional hashVariable)
{
super(sourceLocation, id, statsEquivalentPlanNode);
this.source = source;
this.markerVariable = markerVariable;
this.hashVariable = requireNonNull(hashVariable, "hashVariable is null");
requireNonNull(distinctVariables, "distinctVariables is null");
checkArgument(!distinctVariables.isEmpty(), "distinctVariables cannot be empty");
this.distinctVariables = unmodifiableList(new ArrayList<>(distinctVariables));
List variableReferenceExpressions = new ArrayList<>(source.getOutputVariables());
variableReferenceExpressions.add(markerVariable);
this.output = unmodifiableList(variableReferenceExpressions);
}
@Override
public List getOutputVariables()
{
return output;
}
@Override
public List getSources()
{
return unmodifiableList(Collections.singletonList(source));
}
@JsonProperty
public PlanNode getSource()
{
return source;
}
@JsonProperty
public VariableReferenceExpression getMarkerVariable()
{
return markerVariable;
}
@JsonProperty
public List getDistinctVariables()
{
return distinctVariables;
}
@JsonProperty
public Optional getHashVariable()
{
return hashVariable;
}
@Override
public R accept(PlanVisitor visitor, C context)
{
return visitor.visitMarkDistinct(this, context);
}
@Override
public PlanNode assignStatsEquivalentPlanNode(Optional statsEquivalentPlanNode)
{
return new MarkDistinctNode(getSourceLocation(), getId(), statsEquivalentPlanNode, source, markerVariable, distinctVariables, hashVariable);
}
@Override
public PlanNode replaceChildren(List newChildren)
{
checkArgument(newChildren.size() == 1, "Unexpected number of elements in list newChildren");
return new MarkDistinctNode(getSourceLocation(), getId(), getStatsEquivalentPlanNode(), newChildren.get(0), markerVariable, distinctVariables, hashVariable);
}
private static void checkArgument(boolean condition, String message)
{
if (!condition) {
throw new IllegalArgumentException(message);
}
}
}
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