| /* |
| * 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.mapReduceLayer; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators.POProject; |
| |
| // Representing one sort key. Sort key may be compound if we sort on multiple columns, |
| // if that is the case, then this sort key contains multiple ColumnChainInfo |
| public class ColumnChainInfo implements Cloneable { |
| private List<ColumnInfo> columnInfos = new ArrayList<ColumnInfo>(); |
| public boolean equals(Object o2) |
| { |
| if (!(o2 instanceof ColumnChainInfo)) |
| return false; |
| ColumnChainInfo c2 = (ColumnChainInfo)o2; |
| if (columnInfos.size()!=c2.columnInfos.size()) |
| return false; |
| for (int i=0;i<columnInfos.size();i++) |
| { |
| if (!columnInfos.get(i).equals(c2.columnInfos.get(i))) |
| return false; |
| } |
| return true; |
| } |
| public void insert(List<Integer> columns, byte type) |
| { |
| ColumnInfo newColumnInfo = new ColumnInfo(columns, type); |
| columnInfos.add(newColumnInfo); |
| } |
| |
| /** |
| * Insert new ColumnInfo for a project-star or project-range-to-end |
| * @param startCol |
| * @param type |
| */ |
| public void insert(int startCol, byte type) |
| { |
| ColumnInfo newColumnInfo = new ColumnInfo(startCol, type); |
| columnInfos.add(newColumnInfo); |
| } |
| |
| // In reduce, the input#1 represent the first input, put 0 instead of 1, so |
| // that we can match the sort information collected from POLocalRearrange |
| public void insertInReduce(POProject project) |
| { |
| if (size()==0) |
| { |
| int col; |
| if(project.isProjectToEnd() || project.getColumns().size() != 1){ |
| // expecting first project to be projecting one of the bags |
| // so getting here is unexpected. |
| // setting -1 as the column so that it secondary sort optimization |
| // will not get used |
| col = -1; |
| return; |
| }else{ |
| col = project.getColumns().get(0) - 1; |
| } |
| List<Integer> newColumns = new ArrayList<Integer>(); |
| newColumns.add(col); |
| ColumnInfo newColumnInfo = new ColumnInfo(newColumns, project.getResultType()); |
| columnInfos.add(newColumnInfo); |
| } |
| else if (project.isProjectToEnd()){ |
| insert(project.getStartCol(), project.getResultType()); |
| } |
| else { |
| insert(project.getColumns(), project.getResultType()); |
| } |
| } |
| public void insertColumnChainInfo(ColumnChainInfo columnChainInfo) |
| { |
| columnInfos.addAll(columnChainInfo.columnInfos); |
| } |
| public List<ColumnInfo> getColumnInfos() |
| { |
| return columnInfos; |
| } |
| public String toString() { |
| return columnInfos.toString(); |
| } |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| super.clone(); |
| ColumnChainInfo result = new ColumnChainInfo(); |
| for (ColumnInfo columnInfo:columnInfos) |
| { |
| ColumnInfo newColumnInfo = (ColumnInfo) columnInfo.clone(); |
| result.columnInfos.add(newColumnInfo); |
| } |
| return result; |
| } |
| public int size() { |
| return columnInfos.size(); |
| } |
| public ColumnInfo getColumnInfo(int i) { |
| return columnInfos.get(i); |
| } |
| @Override |
| public int hashCode() { |
| int result = 0; |
| for (ColumnInfo columnInfo : columnInfos) |
| result+=columnInfo.hashCode(); |
| return result; |
| } |
| } |