package com.facebook.presto.operator.scalar;
/*
* 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.
*/
import com.facebook.presto.metadata.BoundVariables;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.TypeManager;
import com.facebook.presto.type.RowType;
import com.google.common.collect.ImmutableList;
import java.lang.invoke.MethodHandle;
import java.util.List;
import static com.facebook.presto.spi.function.OperatorType.LESS_THAN;
import static com.facebook.presto.util.Reflection.methodHandle;
public final class RowLessThanOperator
extends RowComparisonOperator
{
public static final RowLessThanOperator ROW_LESS_THAN = new RowLessThanOperator();
private static final MethodHandle METHOD_HANDLE = methodHandle(RowLessThanOperator.class, "less", RowType.class, List.class, Block.class, Block.class);
private RowLessThanOperator()
{
super(LESS_THAN);
}
@Override
public ScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, TypeManager typeManager, FunctionRegistry functionRegistry)
{
Type type = boundVariables.getTypeVariable("T");
return new ScalarFunctionImplementation(
false,
ImmutableList.of(false, false),
METHOD_HANDLE.bindTo(type).bindTo(getMethodHandles((RowType) type, functionRegistry, LESS_THAN)),
isDeterministic());
}
public static boolean less(
RowType rowType,
List<MethodHandle> lessThanFunctions,
Block leftRow, Block rightRow)
{
int compareResult = compare(rowType, lessThanFunctions, leftRow, rightRow);
return compareResult > 0;
}
}