| /* |
| * 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.storm.sql.planner.streams.rel; |
| |
| import com.google.common.collect.Lists; |
| import java.util.ArrayList; |
| import java.util.List; |
| import org.apache.calcite.plan.RelOptCluster; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.core.Calc; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rex.RexLocalRef; |
| import org.apache.calcite.rex.RexNode; |
| import org.apache.calcite.rex.RexProgram; |
| import org.apache.storm.sql.planner.StormRelUtils; |
| import org.apache.storm.sql.planner.rel.StormCalcRelBase; |
| import org.apache.storm.sql.planner.streams.StreamsPlanCreator; |
| import org.apache.storm.sql.runtime.calcite.ExecutableExpression; |
| import org.apache.storm.sql.runtime.streams.functions.EvaluationCalc; |
| import org.apache.storm.streams.Stream; |
| import org.apache.storm.tuple.Values; |
| |
| public class StreamsCalcRel extends StormCalcRelBase implements StreamsRel { |
| public StreamsCalcRel(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexProgram program) { |
| super(cluster, traits, child, program); |
| } |
| |
| @Override |
| public Calc copy(RelTraitSet traitSet, RelNode child, RexProgram program) { |
| return new StreamsCalcRel(getCluster(), traitSet, child, program); |
| } |
| |
| @Override |
| public void streamsPlan(StreamsPlanCreator planCreator) throws Exception { |
| // SingleRel |
| RelNode input = getInput(); |
| StormRelUtils.getStormRelInput(input).streamsPlan(planCreator); |
| |
| RelDataType inputRowType = getInput(0).getRowType(); |
| |
| // filter |
| ExecutableExpression filterInstance = null; |
| RexLocalRef condition = program.getCondition(); |
| if (condition != null) { |
| RexNode conditionNode = program.expandLocalRef(condition); |
| filterInstance = planCreator.createScalarInstance(Lists.newArrayList(conditionNode), inputRowType, |
| StormRelUtils.getClassName(this)); |
| } |
| |
| // projection |
| ExecutableExpression projectionInstance = null; |
| List<RexLocalRef> projectList = program.getProjectList(); |
| if (projectList != null && !projectList.isEmpty()) { |
| List<RexNode> expandedNodes = new ArrayList<>(); |
| for (RexLocalRef project : projectList) { |
| expandedNodes.add(program.expandLocalRef(project)); |
| } |
| |
| projectionInstance = planCreator.createScalarInstance(expandedNodes, inputRowType, |
| StormRelUtils.getClassName(this)); |
| } |
| |
| if (projectionInstance == null && filterInstance == null) { |
| // it shouldn't be happen |
| throw new IllegalStateException("Either projection or condition, or both should be provided."); |
| } |
| |
| List<String> outputFieldNames = getRowType().getFieldNames(); |
| int outputCount = outputFieldNames.size(); |
| EvaluationCalc evalCalc = new EvaluationCalc(filterInstance, projectionInstance, outputCount, planCreator.getDataContext()); |
| final Stream<Values> inputStream = planCreator.pop(); |
| final Stream finalStream = inputStream.flatMap(evalCalc); |
| |
| planCreator.addStream(finalStream); |
| } |
| } |