001/* 002 * Copyright (c) 2007-2016 Concurrent, Inc. All Rights Reserved. 003 * 004 * Project and contact information: http://www.cascading.org/ 005 * 006 * This file is part of the Cascading project. 007 * 008 * Licensed under the Apache License, Version 2.0 (the "License"); 009 * you may not use this file except in compliance with the License. 010 * You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, software 015 * distributed under the License is distributed on an "AS IS" BASIS, 016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 017 * See the License for the specific language governing permissions and 018 * limitations under the License. 019 */ 020 021package cascading.flow.tez.planner.rule.transformer; 022 023import cascading.flow.planner.iso.expression.ElementCapture; 024import cascading.flow.planner.rule.transformer.BoundaryElementFactory; 025import cascading.flow.planner.rule.transformer.RuleInsertionTransformer; 026import cascading.flow.tez.planner.rule.expression.BalanceSplitToStreamedHashJoinExpression; 027 028import static cascading.flow.planner.rule.PlanPhase.BalanceAssembly; 029 030/** 031 * Inserts Boundary after split that joins back into a HashJoin. 032 * <p/> 033 * this allows testGroupBySplitGroupByJoin to pass, and simplifies testJoinSamePipeAroundGroupBy by preventing 034 * the upstream operations to duplicate processing in parallel nodes 035 */ 036public class BoundaryBalanceSplitToStreamedHashJoinTransformer extends RuleInsertionTransformer 037 { 038 public BoundaryBalanceSplitToStreamedHashJoinTransformer() 039 { 040 super( 041 BalanceAssembly, 042 new BalanceSplitToStreamedHashJoinExpression(), 043 ElementCapture.Secondary, 044 BoundaryElementFactory.BOUNDARY_PIPE 045 ); 046 } 047 }