/**
* 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.tajo.engine.planner.physical;
import org.apache.tajo.worker.TaskAttemptContext;
import org.apache.tajo.engine.eval.EvalContext;
import org.apache.tajo.engine.planner.Target;
import org.apache.tajo.engine.planner.logical.EvalExprNode;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.storage.VTuple;
import java.io.IOException;
public class EvalExprExec extends PhysicalExec {
private final EvalExprNode plan;
private final EvalContext[] evalContexts;
public EvalExprExec(final TaskAttemptContext context, final EvalExprNode plan) {
super(context, plan.getInSchema(), plan.getOutSchema());
this.plan = plan;
evalContexts = new EvalContext[plan.getExprs().length];
for (int i = 0; i < plan.getExprs().length; i++) {
evalContexts[i] = plan.getExprs()[i].getEvalTree().newContext();
}
}
@Override
public void init() throws IOException {
}
/* (non-Javadoc)
* @see PhysicalExec#next()
*/
@Override
public Tuple next() throws IOException {
Target [] targets = plan.getExprs();
Tuple t = new VTuple(targets.length);
for (int i = 0; i < targets.length; i++) {
targets[i].getEvalTree().eval(evalContexts[i], inSchema, null);
t.put(i, targets[i].getEvalTree().terminate(evalContexts[i]));
}
return t;
}
@Override
public void rescan() throws IOException {
}
@Override
public void close() throws IOException {
}
}