/**
* 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.hadoop.hive.ql.exec;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Future;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.CompilationOpContext;
import org.apache.hadoop.hive.ql.exec.persistence.RowContainer;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.MapJoinDesc;
import org.apache.hadoop.hive.ql.plan.api.OperatorType;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
public abstract class AbstractMapJoinOperator <T extends MapJoinDesc> extends CommonJoinOperator<T> implements
Serializable {
private static final long serialVersionUID = 1L;
/**
* The expressions for join inputs's join keys.
*/
protected transient List<ExprNodeEvaluator>[] joinKeys;
/**
* The ObjectInspectors for the join inputs's join keys.
*/
protected transient List<ObjectInspector>[] joinKeysObjectInspectors;
protected transient byte posBigTable = -1; // pos of driver alias
protected transient RowContainer<List<Object>> emptyList = null;
transient int numMapRowsRead;
/** Kryo ctor. */
protected AbstractMapJoinOperator() {
super();
}
public AbstractMapJoinOperator(CompilationOpContext ctx) {
super(ctx);
}
public AbstractMapJoinOperator(AbstractMapJoinOperator<? extends MapJoinDesc> mjop) {
super((CommonJoinOperator)mjop);
}
@Override
@SuppressWarnings("unchecked")
protected void initializeOp(Configuration hconf) throws HiveException {
if (conf.getGenJoinKeys()) {
int tagLen = conf.getTagLength();
joinKeys = new List[tagLen];
JoinUtil.populateJoinKeyValue(joinKeys, conf.getKeys(), NOTSKIPBIGTABLE, hconf);
joinKeysObjectInspectors = JoinUtil.getObjectInspectorsFromEvaluators(joinKeys,
inputObjInspectors,NOTSKIPBIGTABLE, tagLen);
}
super.initializeOp(hconf);
numMapRowsRead = 0;
// all other tables are small, and are cached in the hash table
posBigTable = (byte) conf.getPosBigTable();
emptyList = new RowContainer<List<Object>>(1, hconf, reporter);
RowContainer<List<Object>> bigPosRC = JoinUtil.getRowContainer(hconf,
rowContainerStandardObjectInspectors[posBigTable],
posBigTable, joinCacheSize,spillTableDesc, conf,
!hasFilter(posBigTable), reporter);
storage[posBigTable] = bigPosRC;
}
@Override
protected List<ObjectInspector> getValueObjectInspectors(
byte alias, List<ObjectInspector>[] aliasToObjectInspectors) {
List<ObjectInspector> inspectors = aliasToObjectInspectors[alias];
List<Integer> retained = conf.getRetainList().get(alias);
if (inspectors.size() == retained.size()) {
return inspectors;
}
List<ObjectInspector> retainedOIs = new ArrayList<ObjectInspector>();
for (int index : retained) {
retainedOIs.add(inspectors.get(index));
}
return retainedOIs;
}
@Override
public OperatorType getType() {
return OperatorType.MAPJOIN;
}
@Override
public void closeOp(boolean abort) throws HiveException {
super.closeOp(abort);
emptyList = null;
joinKeys = null;
}
}