
io.prestosql.operator.scalar.GenericDistinctFromOperator 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.prestosql.operator.scalar;
import com.google.common.collect.ImmutableList;
import io.prestosql.metadata.FunctionBinding;
import io.prestosql.metadata.FunctionInvoker;
import io.prestosql.metadata.SqlOperator;
import io.prestosql.spi.function.OperatorType;
import io.prestosql.spi.type.Type;
import io.prestosql.spi.type.TypeOperators;
import io.prestosql.spi.type.TypeSignature;
import java.lang.invoke.MethodHandle;
import java.util.Optional;
import static io.prestosql.metadata.Signature.comparableTypeParameter;
import static io.prestosql.spi.type.BooleanType.BOOLEAN;
import static java.util.Objects.requireNonNull;
public class GenericDistinctFromOperator
extends SqlOperator
{
private final TypeOperators typeOperators;
public GenericDistinctFromOperator(TypeOperators typeOperators)
{
super(OperatorType.IS_DISTINCT_FROM,
ImmutableList.of(comparableTypeParameter("T")),
ImmutableList.of(),
BOOLEAN.getTypeSignature(),
ImmutableList.of(new TypeSignature("T"), new TypeSignature("T")),
false);
this.typeOperators = requireNonNull(typeOperators, "typeOperators is null");
}
@Override
protected ScalarFunctionImplementation specialize(FunctionBinding functionBinding)
{
Type type = functionBinding.getTypeVariable("T");
return invocationConvention -> {
MethodHandle methodHandle = typeOperators.getDistinctFromOperator(type, invocationConvention);
return new FunctionInvoker(methodHandle, Optional.empty());
};
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy