io.trino.sql.ir.optimizer.rule.EvaluateCast 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 io.trino.sql.ir.optimizer.rule;
import io.trino.Session;
import io.trino.metadata.Metadata;
import io.trino.spi.TrinoException;
import io.trino.spi.type.Type;
import io.trino.sql.InterpretedFunctionInvoker;
import io.trino.sql.PlannerContext;
import io.trino.sql.ir.Cast;
import io.trino.sql.ir.Constant;
import io.trino.sql.ir.Expression;
import io.trino.sql.ir.optimizer.IrOptimizerRule;
import io.trino.sql.planner.Symbol;
import java.util.Map;
import java.util.Optional;
import static java.util.Collections.singletonList;
/**
* Evaluates a constant Cast expression
*/
public class EvaluateCast
implements IrOptimizerRule
{
private final InterpretedFunctionInvoker functionInvoker;
private final Metadata metadata;
public EvaluateCast(PlannerContext context)
{
metadata = context.getMetadata();
functionInvoker = new InterpretedFunctionInvoker(context.getFunctionManager());
}
@Override
public Optional apply(Expression expression, Session session, Map bindings)
{
if (expression instanceof Cast(Constant constant, Type type)) {
try {
return Optional.of(new Constant(
type,
functionInvoker.invoke(
metadata.getCoercion(constant.type(), type),
session.toConnectorSession(),
singletonList(constant.value()))));
}
catch (TrinoException _) {
}
}
return Optional.empty();
}
}