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/*
* 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.filter;
import java.util.Iterator;
import org.apache.drill.common.expression.ExpressionPosition;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.visitors.ExprVisitor;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.common.types.Types;
import com.google.common.collect.Iterators;
public class ReturnValueExpression implements LogicalExpression{
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ReturnValueExpression.class);
private LogicalExpression child;
private boolean returnTrueOnOne;
public ReturnValueExpression(LogicalExpression child) {
this(child, true);
}
public ReturnValueExpression(LogicalExpression child, boolean returnTrueOnOne) {
this.child = child;
this.returnTrueOnOne = returnTrueOnOne;
}
public LogicalExpression getChild() {
return child;
}
@Override
public MajorType getMajorType() {
return Types.NULL;
}
@Override
public <T, V, E extends Exception> T accept(ExprVisitor<T, V, E> visitor, V value) throws E {
return visitor.visitUnknown(this, value);
}
@Override
public ExpressionPosition getPosition() {
return ExpressionPosition.UNKNOWN;
}
@Override
public Iterator<LogicalExpression> iterator() {
return Iterators.singletonIterator(child);
}
public boolean isReturnTrueOnOne() {
return returnTrueOnOne;
}
public int getSelfCost() {
throw new UnsupportedOperationException(String.format("The type of %s doesn't currently support LogicalExpression.getSelfCost().", this.getClass().getCanonicalName()));
}
public int getCumulativeCost() {
throw new UnsupportedOperationException(String.format("The type of %s doesn't currently support LogicalExpression.getCumulativeCost().", this.getClass().getCanonicalName()));
}
}
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