| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.wayang.basic.operators; |
| |
| import org.apache.commons.lang3.Validate; |
| import org.apache.wayang.basic.data.Tuple2; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimator; |
| import org.apache.wayang.core.optimizer.cardinality.DefaultCardinalityEstimator; |
| import org.apache.wayang.core.plan.wayangplan.BinaryToUnaryOperator; |
| import org.apache.wayang.core.types.DataSetType; |
| |
| import java.util.Optional; |
| |
| |
| /** |
| * This operator returns the cartesian product of elements of input datasets. |
| */ |
| public class CartesianOperator<InputType0, InputType1> |
| extends BinaryToUnaryOperator<InputType0, InputType1, Tuple2<InputType0, InputType1>> { |
| |
| public CartesianOperator(Class<InputType0> inputType0Class, Class<InputType1> inputType1Class) { |
| super(DataSetType.createDefault(inputType0Class), |
| DataSetType.createDefault(inputType1Class), |
| DataSetType.createDefaultUnchecked(Tuple2.class), |
| true); |
| } |
| |
| public CartesianOperator(DataSetType<InputType0> inputType0, DataSetType<InputType1> inputType1) { |
| super(inputType0, inputType1, DataSetType.createDefaultUnchecked(Tuple2.class), true); |
| } |
| |
| /** |
| * Copies an instance (exclusive of broadcasts). |
| * |
| * @param that that should be copied |
| */ |
| public CartesianOperator(CartesianOperator<InputType0, InputType1> that) { |
| super(that); |
| } |
| |
| @Override |
| public Optional<CardinalityEstimator> createCardinalityEstimator( |
| final int outputIndex, |
| final Configuration configuration) { |
| Validate.inclusiveBetween(0, this.getNumOutputs() - 1, outputIndex); |
| return Optional.of(new DefaultCardinalityEstimator( |
| 1d, 2, this.isSupportingBroadcastInputs(), |
| inputCards -> inputCards[0] * inputCards[1] |
| )); |
| } |
| } |