CorrelationMatcher.java
/*
* 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.assertions;
import com.facebook.presto.Session;
import com.facebook.presto.cost.StatsProvider;
import com.facebook.presto.metadata.Metadata;
import com.facebook.presto.spi.plan.PlanNode;
import com.facebook.presto.spi.relation.VariableReferenceExpression;
import com.facebook.presto.sql.planner.plan.ApplyNode;
import com.facebook.presto.sql.planner.plan.LateralJoinNode;
import java.util.List;
import static com.facebook.presto.sql.analyzer.ExpressionTreeUtils.createSymbolReference;
import static com.facebook.presto.sql.planner.assertions.MatchResult.NO_MATCH;
import static com.facebook.presto.sql.planner.assertions.MatchResult.match;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class CorrelationMatcher
implements Matcher
{
private final List<String> correlation;
CorrelationMatcher(List<String> correlation)
{
this.correlation = requireNonNull(correlation, "correlation is null");
}
@Override
public boolean shapeMatches(PlanNode node)
{
return node instanceof ApplyNode || node instanceof LateralJoinNode;
}
@Override
public MatchResult detailMatches(PlanNode node, StatsProvider stats, Session session, Metadata metadata, SymbolAliases symbolAliases)
{
checkState(
shapeMatches(node),
"Plan testing framework error: shapeMatches returned false in detailMatches in %s",
this.getClass().getName());
List<VariableReferenceExpression> actualCorrelation = getCorrelation(node);
if (this.correlation.size() != actualCorrelation.size()) {
return NO_MATCH;
}
int i = 0;
for (String alias : this.correlation) {
if (!symbolAliases.get(alias).equals(createSymbolReference(actualCorrelation.get(i++)))) {
return NO_MATCH;
}
}
return match();
}
private List<VariableReferenceExpression> getCorrelation(PlanNode node)
{
if (node instanceof ApplyNode) {
return ((ApplyNode) node).getCorrelation();
}
else if (node instanceof LateralJoinNode) {
return ((LateralJoinNode) node).getCorrelation();
}
else {
throw new IllegalStateException("Unexpected plan node: " + node);
}
}
@Override
public String toString()
{
return toStringHelper(this)
.add("correlation", correlation)
.toString();
}
}