/**
* 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.drill.exec.physical.impl.validate;
import java.util.List;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.base.AbstractPhysicalVisitor;
import org.apache.drill.exec.physical.base.FragmentRoot;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.IteratorValidator;
import com.google.common.collect.Lists;
public class IteratorValidatorInjector extends
AbstractPhysicalVisitor<PhysicalOperator, FragmentContext, ExecutionSetupException> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(IteratorValidatorInjector.class);
public static FragmentRoot rewritePlanWithIteratorValidator(FragmentContext context, FragmentRoot root) throws ExecutionSetupException {
IteratorValidatorInjector inject = new IteratorValidatorInjector();
PhysicalOperator newOp = root.accept(inject, context);
if( !(newOp instanceof FragmentRoot) ) throw new IllegalStateException("This shouldn't happen.");
return (FragmentRoot) newOp;
}
/**
* Traverse the physical plan and inject the IteratorValidator operator after every operator.
*
* @param op
* Physical operator under which the IteratorValidator operator will be injected
* @param context
* Fragment context
* @return same physical operator as passed in, but its child will be a IteratorValidator operator whose child will be the
* original child of this operator
* @throws ExecutionSetupException
*/
@Override
public PhysicalOperator visitOp(PhysicalOperator op, FragmentContext context) throws ExecutionSetupException {
List<PhysicalOperator> newChildren = Lists.newArrayList();
PhysicalOperator newOp = op;
/* Get the list of child operators */
for (PhysicalOperator child : op) {
PhysicalOperator validator = new IteratorValidator(child.accept(this, context));
validator.setOperatorId(op.getOperatorId() + 1000);
newChildren.add(validator);
}
/* Inject trace operator */
if (newChildren.size() > 0){
newOp = op.getNewWithChildren(newChildren);
newOp.setOperatorId(op.getOperatorId());
}
return newOp;
}
}