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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 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.hadoop.hive.ql.plan;
 import java.util.List;
 import java.util.Map;
 import  org.apache.hadoop.fs.FileStatus;
 import  org.apache.hadoop.fs.FileSystem;
 import  org.apache.hadoop.fs.Path;
   private static final long serialVersionUID = 1L;

   public static class ConditionalResolverSkewJoinCtx implements Serializable {
     private static final long serialVersionUID = 1L;
     // we store big keys in one table into one dir, and same keys in other
     // tables into corresponding different dirs (one dir per table).
     // this map stores mapping from "big key dir" to its corresponding mapjoin
     // task.
     HashMap<StringTask<? extends Serializable>> dirToTaskMap;

For serialization use only.
     public ConditionalResolverSkewJoinCtx() {
         HashMap<StringTask<? extends Serializable>> dirToTaskMap) {
       this. = dirToTaskMap;
     public HashMap<StringTask<? extends Serializable>> getDirToTaskMap() {
       return ;
     public void setDirToTaskMap(
         HashMap<StringTask<? extends Serializable>> dirToTaskMap) {
       this. = dirToTaskMap;
   public List<Task<? extends Serializable>> getTasks(HiveConf conf,
       Object objCtx) {
     List<Task<? extends Serializable>> resTsks = new ArrayList<Task<? extends Serializable>>();
     Map<StringTask<? extends Serializable>> dirToTaskMap = ctx
     Iterator<Entry<StringTask<? extends Serializable>>> bigKeysPathsIter = dirToTaskMap
     try {
       while (bigKeysPathsIter.hasNext()) {
         Entry<StringTask<? extends Serializable>> entry = bigKeysPathsIter
         String path = entry.getKey();
         Path dirPath = new Path(path);
         FileSystem inpFs = dirPath.getFileSystem(conf);
         FileStatus[] fstatus = inpFs.listStatus(dirPath);
         if (fstatus.length > 0) {
           Task <? extends Serializabletask = entry.getValue();
           List<Task <? extends Serializable>> parentOps = task.getParentTasks();
            for(Task <? extends SerializableparentOpparentOps){
              //right now only one parent
    } catch (IOException e) {
    return resTsks;
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