org.apache.hadoop.hive.ql.exec.vector.mapjoin.fast.VectorMapJoinFastStringCommon 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 java.io.IOException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.binarysortable.fast.BinarySortableDeserializeRead;
import org.apache.hadoop.hive.serde2.fast.DeserializeRead.ReadStringResults;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.io.BytesWritable;
/*
* An single byte array value hash map optimized for vector map join.
*/
public class VectorMapJoinFastStringCommon {
private boolean isOuterJoin;
private BinarySortableDeserializeRead keyBinarySortableDeserializeRead;
private ReadStringResults readStringResults;
public void adaptPutRow(VectorMapJoinFastBytesHashTable hashTable,
BytesWritable currentKey, BytesWritable currentValue) throws HiveException, IOException {
byte[] keyBytes = currentKey.getBytes();
int keyLength = currentKey.getLength();
keyBinarySortableDeserializeRead.set(keyBytes, 0, keyLength);
if (keyBinarySortableDeserializeRead.readCheckNull()) {
if (isOuterJoin) {
return;
} else {
// For inner join, we expect all NULL values to have been filtered out before now.
throw new HiveException("Unexpected NULL in map join small table");
}
}
keyBinarySortableDeserializeRead.readString(readStringResults);
hashTable.add(readStringResults.bytes, readStringResults.start, readStringResults.length,
currentValue);
}
public VectorMapJoinFastStringCommon(boolean isOuterJoin) {
this.isOuterJoin = isOuterJoin;
PrimitiveTypeInfo[] primitiveTypeInfos = { TypeInfoFactory.stringTypeInfo };
keyBinarySortableDeserializeRead = new BinarySortableDeserializeRead(primitiveTypeInfos);
readStringResults = keyBinarySortableDeserializeRead.createReadStringResults();
}
}