/**
* 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;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.exec.SelectOperator;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression;
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.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.OperatorDesc;
import org.apache.hadoop.hive.ql.plan.SelectDesc;
import org.apache.hadoop.hive.ql.plan.api.OperatorType;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory;
/**
* Select operator implementation.
*/
public class VectorSelectOperator extends SelectOperator implements VectorizationContextRegion {
private static final long serialVersionUID = 1L;
protected VectorExpression[] vExpressions = null;
private transient int [] projectedColumns = null;
private transient VectorExpressionWriter [] valueWriters = null;
// Create a new outgoing vectorization context because column name map will change.
private VectorizationContext vOutContext;
public VectorSelectOperator(VectorizationContext vContext, OperatorDesc conf)
throws HiveException {
this.conf = (SelectDesc) conf;
List<ExprNodeDesc> colList = this.conf.getColList();
vExpressions = new VectorExpression[colList.size()];
for (int i = 0; i < colList.size(); i++) {
ExprNodeDesc expr = colList.get(i);
VectorExpression ve = vContext.getVectorExpression(expr);
vExpressions[i] = ve;
}
/**
* Create a new vectorization context to update the column map but same output column manager
* must be inherited to track the scratch the columns.
*/
vOutContext = new VectorizationContext(vContext);
// Set a fileKey, although this operator doesn't use it.
vOutContext.setFileKey(vContext.getFileKey() + "/_SELECT_");
// Update column map
vOutContext.getColumnMap().clear();
for (int i=0; i < colList.size(); ++i) {
String columnName = this.conf.getOutputColumnNames().get(i);
VectorExpression ve = vExpressions[i];
vOutContext.addToColumnMap(columnName, ve.getOutputColumn());
}
}
public VectorSelectOperator() {
}
@Override
protected void initializeOp(Configuration hconf) throws HiveException {
// Just forward the row as is
if (conf.isSelStarNoCompute()) {
initializeChildren(hconf);
return;
}
List<ObjectInspector> objectInspectors = new ArrayList<ObjectInspector>();
List<ExprNodeDesc> colList = conf.getColList();
valueWriters = VectorExpressionWriterFactory.getExpressionWriters(colList);
for (VectorExpressionWriter vew : valueWriters) {
objectInspectors.add(vew.getObjectInspector());
}
List<String> outputFieldNames = conf.getOutputColumnNames();
outputObjInspector = ObjectInspectorFactory.getStandardStructObjectInspector(
outputFieldNames, objectInspectors);
initializeChildren(hconf);
projectedColumns = new int [vExpressions.length];
for (int i = 0; i < projectedColumns.length; i++) {
projectedColumns[i] = vExpressions[i].getOutputColumn();
}
}
@Override
public void processOp(Object row, int tag) throws HiveException {
// Just forward the row as is
if (conf.isSelStarNoCompute()) {
forward(row, inputObjInspectors[tag]);
return;
}
VectorizedRowBatch vrg = (VectorizedRowBatch) row;
for (int i = 0; i < vExpressions.length; i++) {
try {
vExpressions[i].evaluate(vrg);
} catch (RuntimeException e) {
throw new HiveException("Error evaluating "
+ conf.getColList().get(i).getExprString(), e);
}
}
// Prepare output, set the projections
VectorExpressionWriter [] originalValueWriters = vrg.valueWriters;
vrg.setValueWriters(valueWriters);
int[] originalProjections = vrg.projectedColumns;
int originalProjectionSize = vrg.projectionSize;
vrg.projectionSize = vExpressions.length;
vrg.projectedColumns = this.projectedColumns;
forward(vrg, outputObjInspector);
// Revert the projected columns back, because vrg will be re-used.
vrg.projectionSize = originalProjectionSize;
vrg.projectedColumns = originalProjections;
vrg.valueWriters = originalValueWriters;
}
static public String getOperatorName() {
return "SEL";
}
public VectorExpression[] getvExpressions() {
return vExpressions;
}
public VectorExpression[] getVExpressions() {
return vExpressions;
}
public void setvExpressions(VectorExpression[] vExpressions) {
this.vExpressions = vExpressions;
}
public void setVExpressions(VectorExpression[] vExpressions) {
this.vExpressions = vExpressions;
}
@Override
public VectorizationContext getOuputVectorizationContext() {
return vOutContext;
}
}