| /** |
| * 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.pig.backend.hadoop.executionengine.spark.optimizer; |
| |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.NoopFilterRemoverUtil; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.PhysicalOperator; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.ConstantExpression; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.plans.PhysicalPlan; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.relationalOperators.POFilter; |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.util.PlanHelper; |
| import org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkOpPlanVisitor; |
| import org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkOperPlan; |
| import org.apache.pig.backend.hadoop.executionengine.spark.plan.SparkOperator; |
| import org.apache.pig.impl.plan.DependencyOrderWalker; |
| import org.apache.pig.impl.plan.VisitorException; |
| |
| /** |
| * For historical reasons splits will always produce filters that pass |
| * everything through unchanged. This optimizer removes these. |
| * <p/> |
| * The condition we look for is POFilters with a constant boolean |
| * (true) expression as it's plan. |
| */ |
| public class NoopFilterRemover extends SparkOpPlanVisitor { |
| private Log log = LogFactory.getLog(NoopFilterRemover.class); |
| |
| public NoopFilterRemover(SparkOperPlan plan) { |
| super(plan, new DependencyOrderWalker<SparkOperator, SparkOperPlan>(plan)); |
| } |
| |
| @Override |
| public void visitSparkOp(SparkOperator sparkOp) throws VisitorException { |
| List<POFilter> filters = PlanHelper.getPhysicalOperators(sparkOp |
| .physicalPlan, POFilter.class); |
| for (POFilter filter : filters) { |
| PhysicalPlan filterPlan = filter.getPlan(); |
| if (filterPlan.size() == 1) { |
| PhysicalOperator fp = filterPlan.getRoots().get(0); |
| if (fp instanceof ConstantExpression) { |
| ConstantExpression exp = (ConstantExpression) fp; |
| Object value = exp.getValue(); |
| if (value instanceof Boolean) { |
| Boolean filterValue = (Boolean) value; |
| if (filterValue) { |
| NoopFilterRemoverUtil.removeFilter(filter, sparkOp.physicalPlan); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |