| /* |
| * 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.beam.sdk.extensions.sql.impl.rel; |
| |
| import java.util.List; |
| import org.apache.beam.sdk.extensions.sql.impl.planner.BeamCostModel; |
| import org.apache.beam.sdk.extensions.sql.impl.planner.BeamRelMetadataQuery; |
| import org.apache.beam.sdk.extensions.sql.impl.planner.NodeStats; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.PCollectionList; |
| import org.apache.beam.sdk.values.Row; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.plan.RelOptCluster; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.plan.RelOptPlanner; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.plan.RelTraitSet; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.RelNode; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.core.Minus; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rel.core.SetOp; |
| |
| /** |
| * {@code BeamRelNode} to replace a {@code Minus} node. |
| * |
| * <p>Corresponds to the SQL {@code EXCEPT} operator. |
| */ |
| public class BeamMinusRel extends Minus implements BeamRelNode { |
| |
| public BeamMinusRel( |
| RelOptCluster cluster, RelTraitSet traits, List<RelNode> inputs, boolean all) { |
| super(cluster, traits, inputs, all); |
| } |
| |
| @Override |
| public BeamCostModel beamComputeSelfCost(RelOptPlanner planner, BeamRelMetadataQuery mq) { |
| NodeStats inputsEstimatesSummation = |
| inputs.stream() |
| .map(input -> BeamSqlRelUtils.getNodeStats(input, mq)) |
| .reduce(NodeStats.create(0, 0, 0), NodeStats::plus); |
| |
| return BeamCostModel.FACTORY.makeCost( |
| inputsEstimatesSummation.getRowCount(), inputsEstimatesSummation.getRate()); |
| } |
| |
| @Override |
| public SetOp copy(RelTraitSet traitSet, List<RelNode> inputs, boolean all) { |
| return new BeamMinusRel(getCluster(), traitSet, inputs, all); |
| } |
| |
| @Override |
| public PTransform<PCollectionList<Row>, PCollection<Row>> buildPTransform() { |
| return new BeamSetOperatorRelBase(this, BeamSetOperatorRelBase.OpType.MINUS, all); |
| } |
| |
| @Override |
| public NodeStats estimateNodeStats(BeamRelMetadataQuery mq) { |
| NodeStats firstInputEstimates = BeamSqlRelUtils.getNodeStats(inputs.get(0), mq); |
| // The first input minus half of the others. (We are assuming half of them have intersection) |
| for (int i = 1; i < inputs.size(); i++) { |
| NodeStats inputEstimate = BeamSqlRelUtils.getNodeStats(inputs.get(i), mq); |
| firstInputEstimates = firstInputEstimates.minus(inputEstimate.multiply(0.5)); |
| } |
| return firstInputEstimates; |
| } |
| } |