org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastLongHashUtil Maven / Gradle / Ivy
/**
* 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 java.io.IOException;
import org.apache.hadoop.hive.ql.plan.VectorMapJoinDesc.HashTableKeyType;
import org.apache.hadoop.hive.serde2.binarysortable.fast.BinarySortableDeserializeRead;
public class VectorMapJoinFastLongHashUtil {
public static long hashKey(long key) {
key = (~key) + (key << 21); // key = (key << 21) - key - 1;
key = key ^ (key >>> 24);
key = (key + (key << 3)) + (key << 8); // key * 265
key = key ^ (key >>> 14);
key = (key + (key << 2)) + (key << 4); // key * 21
key = key ^ (key >>> 28);
key = key + (key << 31);
return key;
}
public static long deserializeLongKey(BinarySortableDeserializeRead keyBinarySortableDeserializeRead,
HashTableKeyType hashTableKeyType) throws IOException {
long key = 0;
switch (hashTableKeyType) {
case BOOLEAN:
key = (keyBinarySortableDeserializeRead.readBoolean() ? 1 : 0);
break;
case BYTE:
key = (long) keyBinarySortableDeserializeRead.readByte();
break;
case SHORT:
key = (long) keyBinarySortableDeserializeRead.readShort();
break;
case INT:
key = (long) keyBinarySortableDeserializeRead.readInt();
break;
case LONG:
key = keyBinarySortableDeserializeRead.readLong();
break;
default:
throw new RuntimeException("Unexpected hash table key type " + hashTableKeyType.name());
}
return key;
}
}