/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.CompilationOpContext;
import org.apache.hadoop.hive.ql.exec.Operator;
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.VectorSelectDesc;
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;
import com.google.common.annotations.VisibleForTesting;
/**
* Select operator implementation.
*/
public class VectorSelectOperator extends Operator<SelectDesc> implements
VectorizationContextRegion {
private static final long serialVersionUID = 1L;
private VectorSelectDesc vectorDesc;
private VectorExpression[] vExpressions = null;
private int [] projectedOutputColumns = null;
private transient VectorExpressionWriter [] valueWriters = null;
// Create a new outgoing vectorization context because column name map will change.
private VectorizationContext vOutContext;
public VectorSelectOperator(CompilationOpContext ctx,
VectorizationContext vContext, OperatorDesc conf) throws HiveException {
this(ctx);
this.conf = (SelectDesc) conf;
vectorDesc = (VectorSelectDesc) this.conf.getVectorDesc();
vExpressions = vectorDesc.getSelectExpressions();
projectedOutputColumns = vectorDesc.getProjectedOutputColumns();
/**
* Create a new vectorization context to create a new projection, but keep
* same output column manager must be inherited to track the scratch the columns.
*/
vOutContext = new VectorizationContext(getName(), vContext);
vOutContext.resetProjectionColumns();
List<String> outputColumnNames = this.conf.getOutputColumnNames();
for (int i=0; i < projectedOutputColumns.length; ++i) {
String columnName = outputColumnNames.get(i);
vOutContext.addProjectionColumn(columnName, projectedOutputColumns[i]);
}
}
/** Kryo ctor. */
@VisibleForTesting
public VectorSelectOperator() {
super();
}
public VectorSelectOperator(CompilationOpContext ctx) {
super(ctx);
}
@Override
protected void initializeOp(Configuration hconf) throws HiveException {
super.initializeOp(hconf);
// Just forward the row as is
if (conf.isSelStarNoCompute()) {
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);
}
@Override
public void process(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
int[] originalProjections = vrg.projectedColumns;
int originalProjectionSize = vrg.projectionSize;
vrg.projectionSize = projectedOutputColumns.length;
vrg.projectedColumns = this.projectedOutputColumns;
forward(vrg, outputObjInspector);
// Revert the projected columns back, because vrg will be re-used.
vrg.projectionSize = originalProjectionSize;
vrg.projectedColumns = originalProjections;
}
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;
}
@Override
public OperatorType getType() {
return OperatorType.SELECT;
}
@Override
public String getName() {
return getOperatorName();
}
static public String getOperatorName() {
return "SEL";
}
}