/*
* 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.pig.backend.hadoop.executionengine.physicalLayer.expressionOperators;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.plan.OperatorKey;
import org.apache.pig.impl.util.IdentityHashSet;
/**
* This is a base class for all unary comparison operators. Supports the
* use of operand type instead of result type as the result type is
* always boolean.
*
*/
public abstract class UnaryComparisonOperator extends UnaryExpressionOperator
implements ComparisonOperator {
//The result type for comparison operators is always
//Boolean. So the plans evaluating these should consider
//the type of the operands instead of the result.
//The result will be comunicated using the Status object.
//This is a slight abuse of the status object.
protected byte operandType;
public UnaryComparisonOperator(OperatorKey k) {
this(k,-1);
}
public UnaryComparisonOperator(OperatorKey k, int rp) {
super(k, rp);
}
public byte getOperandType() {
return operandType;
}
public void setOperandType(byte operandType) {
this.operandType = operandType;
}
@Override
public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) {
if(illustrator != null) {
illustrator.setSubExpResult(eqClassIndex == 0);
}
return null;
}
}