| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.algebricks.rewriter.rules; |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| import org.apache.commons.lang3.mutable.MutableObject; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.IOptimizationContext; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalExpressionTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AssignOperator; |
| import edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule; |
| |
| public abstract class AbstractExtractExprRule implements IAlgebraicRewriteRule { |
| |
| protected LogicalVariable extractExprIntoAssignOpRef(ILogicalExpression gExpr, Mutable<ILogicalOperator> opRef2, |
| IOptimizationContext context) throws AlgebricksException { |
| LogicalVariable v = context.newVar(); |
| AssignOperator a = new AssignOperator(v, new MutableObject<ILogicalExpression>(gExpr)); |
| a.getInputs().add(new MutableObject<ILogicalOperator>(opRef2.getValue())); |
| opRef2.setValue(a); |
| if (gExpr.getExpressionTag() == LogicalExpressionTag.CONSTANT) { |
| context.addNotToBeInlinedVar(v); |
| } |
| context.computeAndSetTypeEnvironmentForOperator(a); |
| return v; |
| } |
| |
| } |