/*
* 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.metadata.Metadata;
import com.facebook.presto.sql.planner.Symbol;
import com.facebook.presto.sql.planner.plan.AggregationNode;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.tree.FunctionCall;
import java.util.Map;
import java.util.Optional;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class AggregationFunctionMatcher
implements RvalueMatcher
{
private final ExpectedValueProvider<FunctionCall> callMaker;
public AggregationFunctionMatcher(ExpectedValueProvider<FunctionCall> callMaker)
{
this.callMaker = requireNonNull(callMaker, "functionCall is null");
}
@Override
public Optional<Symbol> getAssignedSymbol(PlanNode node, Session session, Metadata metadata, SymbolAliases symbolAliases)
{
Optional<Symbol> result = Optional.empty();
if (!(node instanceof AggregationNode)) {
return result;
}
AggregationNode aggregationNode = (AggregationNode) node;
FunctionCall expectedCall = callMaker.getExpectedValue(symbolAliases);
for (Map.Entry<Symbol, FunctionCall> assignment : aggregationNode.getAggregations().entrySet()) {
if (expectedCall.equals(assignment.getValue())) {
checkState(!result.isPresent(), "Ambiguous function calls in %s", aggregationNode);
result = Optional.of(assignment.getKey());
}
}
return result;
}
@Override
public String toString()
{
return callMaker.toString();
}
}