org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastLongHashMap Maven / Gradle / Ivy
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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
*
* 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.vector.mapjoin.fast;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.JoinUtil;
import org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinHashMapResult;
import org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinLongHashMap;
import org.apache.hadoop.hive.ql.plan.VectorMapJoinDesc.HashTableKeyType;
import org.apache.hadoop.io.BytesWritable;
/*
* An single long value map optimized for vector map join.
*/
public class VectorMapJoinFastLongHashMap
extends VectorMapJoinFastLongHashTable
implements VectorMapJoinLongHashMap {
public static final Log LOG = LogFactory.getLog(VectorMapJoinFastLongHashMap.class);
protected VectorMapJoinFastValueStore valueStore;
@Override
public VectorMapJoinHashMapResult createHashMapResult() {
return new VectorMapJoinFastValueStore.HashMapResult();
}
@Override
public void assignSlot(int slot, long key, boolean isNewKey, BytesWritable currentValue) {
byte[] valueBytes = currentValue.getBytes();
int valueLength = currentValue.getLength();
int pairIndex = 2 * slot;
if (isNewKey) {
// First entry.
slotPairs[pairIndex] = valueStore.addFirst(valueBytes, 0, valueLength);
slotPairs[pairIndex + 1] = key;
} else {
// Add another value.
slotPairs[pairIndex] = valueStore.addMore(slotPairs[pairIndex], valueBytes, 0, valueLength);
}
}
@Override
public JoinUtil.JoinResult lookup(long key, VectorMapJoinHashMapResult hashMapResult) {
VectorMapJoinFastValueStore.HashMapResult optimizedHashMapResult =
(VectorMapJoinFastValueStore.HashMapResult) hashMapResult;
optimizedHashMapResult.forget();
long hashCode = VectorMapJoinFastLongHashUtil.hashKey(key);
// LOG.debug("VectorMapJoinFastLongHashMap lookup " + key + " hashCode " + hashCode);
long valueRef = findReadSlot(key, hashCode);
JoinUtil.JoinResult joinResult;
if (valueRef == -1) {
joinResult = JoinUtil.JoinResult.NOMATCH;
} else {
optimizedHashMapResult.set(valueStore, valueRef);
joinResult = JoinUtil.JoinResult.MATCH;
}
optimizedHashMapResult.setJoinResult(joinResult);
return joinResult;
}
public VectorMapJoinFastLongHashMap(
boolean minMaxEnabled, boolean isOuterJoin, HashTableKeyType hashTableKeyType,
int initialCapacity, float loadFactor, int writeBuffersSize) {
super(minMaxEnabled, isOuterJoin, hashTableKeyType,
initialCapacity, loadFactor, writeBuffersSize);
valueStore = new VectorMapJoinFastValueStore(writeBuffersSize);
}
}