/**
* 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;
import java.io.Serializable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.ExtractDesc;
import org.apache.hadoop.hive.ql.plan.api.OperatorType;
/**
* Extract operator implementation Extracts a subobject and passes that on.
**/
public class ExtractOperator extends Operator<ExtractDesc> implements
Serializable {
private static final long serialVersionUID = 1L;
protected transient ExprNodeEvaluator eval;
@Override
protected void initializeOp(Configuration hconf) throws HiveException {
eval = ExprNodeEvaluatorFactory.get(conf.getCol());
outputObjInspector = eval.initialize(inputObjInspectors[0]);
initializeChildren(hconf);
}
@Override
public void processOp(Object row, int tag) throws HiveException {
forward(eval.evaluate(row), outputObjInspector);
}
@Override
public OperatorType getType() {
return OperatorType.EXTRACT;
}
}