io.trino.sql.relational.StandardFunctionResolution 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.relational;
import com.google.common.collect.ImmutableList;
import io.trino.metadata.Metadata;
import io.trino.metadata.ResolvedFunction;
import io.trino.spi.function.OperatorType;
import io.trino.spi.type.Type;
import io.trino.sql.ir.Comparison;
import static io.trino.spi.function.OperatorType.EQUAL;
import static io.trino.spi.function.OperatorType.IDENTICAL;
import static io.trino.spi.function.OperatorType.LESS_THAN;
import static io.trino.spi.function.OperatorType.LESS_THAN_OR_EQUAL;
import static java.util.Objects.requireNonNull;
public final class StandardFunctionResolution
{
private final Metadata metadata;
public StandardFunctionResolution(Metadata metadata)
{
this.metadata = requireNonNull(metadata, "metadata is null");
}
public ResolvedFunction comparisonFunction(Comparison.Operator operator, Type leftType, Type rightType)
{
OperatorType operatorType = switch (operator) {
case EQUAL -> EQUAL;
case LESS_THAN -> LESS_THAN;
case LESS_THAN_OR_EQUAL -> LESS_THAN_OR_EQUAL;
case IDENTICAL -> IDENTICAL;
default -> throw new IllegalStateException("Unsupported comparison operator type: " + operator);
};
return metadata.resolveOperator(operatorType, ImmutableList.of(leftType, rightType));
}
}