org.apache.hadoop.hive.ql.io.orc.VectorizedOrcSerde 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.io.orc;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpressionWriter;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpressionWriterFactory;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.io.ObjectWritable;
import org.apache.hadoop.io.Writable;
/**
* A serde class for ORC.
* It transparently passes the object to/from the ORC file reader/writer.
*/
public class VectorizedOrcSerde extends OrcSerde {
private final OrcStruct [] orcStructArray = new OrcStruct [VectorizedRowBatch.DEFAULT_SIZE];
private final Writable [] orcRowArray = new Writable [VectorizedRowBatch.DEFAULT_SIZE];
private final ObjectWritable ow = new ObjectWritable();
private final ObjectInspector inspector = null;
private final VectorExpressionWriter [] valueWriters;
public VectorizedOrcSerde(ObjectInspector objInspector) {
super();
for (int i = 0; i < orcStructArray.length; i++) {
orcRowArray[i] = new OrcSerdeRow();
}
try {
valueWriters = VectorExpressionWriterFactory
.getExpressionWriters((StructObjectInspector) objInspector);
} catch (HiveException e) {
throw new RuntimeException(e);
}
}
@Override
public Writable serialize(Object obj, ObjectInspector inspector) {
VectorizedRowBatch batch = (VectorizedRowBatch) obj;
try {
for (int i = 0; i < batch.size; i++) {
OrcStruct ost = orcStructArray[i];
if (ost == null) {
ost = new OrcStruct(batch.numCols);
orcStructArray[i] = ost;
}
int index = 0;
if (batch.selectedInUse) {
index = batch.selected[i];
} else {
index = i;
}
for (int p = 0; p < batch.projectionSize; p++) {
int k = batch.projectedColumns[p];
if (batch.cols[k].isRepeating) {
valueWriters[p].setValue(ost, batch.cols[k], 0);
} else {
valueWriters[p].setValue(ost, batch.cols[k], index);
}
}
OrcSerdeRow row = (OrcSerdeRow) orcRowArray[i];
row.realRow = ost;
row.inspector = inspector;
}
} catch (HiveException ex) {
throw new RuntimeException(ex);
}
ow.set(orcRowArray);
return ow;
}
}