| /* |
| * 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())); |
| } |
| |
| } |