/**
* 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 org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
/**
* ExprNodeConstantEvaluator.
*
*/
public class ExprNodeConstantEvaluator extends ExprNodeEvaluator<ExprNodeConstantDesc> {
transient ConstantObjectInspector writableObjectInspector;
public ExprNodeConstantEvaluator(ExprNodeConstantDesc expr) {
this(expr, null);
}
public ExprNodeConstantEvaluator(ExprNodeConstantDesc expr, Configuration conf) {
super(expr, conf);
writableObjectInspector = expr.getWritableObjectInspector();
}
@Override
public ObjectInspector initialize(ObjectInspector rowInspector) throws HiveException {
return writableObjectInspector;
}
@Override
protected Object _evaluate(Object row, int version) throws HiveException {
return writableObjectInspector.getWritableConstantValue();
}
}