| package edu.uci.ics.asterix.optimizer.rules; |
| |
| |
| |
| import org.apache.commons.lang3.mutable.Mutable; |
| |
| import edu.uci.ics.asterix.optimizer.base.AnalysisUtil; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.common.utils.Pair; |
| 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.LogicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.VariableReferenceExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder; |
| import edu.uci.ics.hyracks.algebricks.rewriter.rules.AbstractExtractExprRule; |
| |
| public class ExtractOrderExpressionsRule extends AbstractExtractExprRule { |
| |
| @Override |
| public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context) { |
| return false; |
| } |
| |
| @Override |
| public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context) throws AlgebricksException { |
| |
| AbstractLogicalOperator op1 = (AbstractLogicalOperator) opRef.getValue(); |
| if (op1.getOperatorTag() != LogicalOperatorTag.ORDER) { |
| return false; |
| } |
| |
| if (context.checkIfInDontApplySet(this, op1)) { |
| return false; |
| } |
| context.addToDontApplySet(this, op1); |
| OrderOperator oo = (OrderOperator) op1; |
| |
| if (!orderHasComplexExpr(oo)) { |
| return false; |
| } |
| Mutable<ILogicalOperator> opRef2 = oo.getInputs().get(0); |
| for (Pair<IOrder, Mutable<ILogicalExpression>> orderPair : oo.getOrderExpressions()) { |
| ILogicalExpression expr = orderPair.second.getValue(); |
| if (expr.getExpressionTag() != LogicalExpressionTag.VARIABLE && !AnalysisUtil.isAccessToFieldRecord(expr)) { |
| LogicalVariable v = extractExprIntoAssignOpRef(expr, opRef2, context); |
| orderPair.second.setValue(new VariableReferenceExpression(v)); |
| } |
| } |
| context.computeAndSetTypeEnvironmentForOperator(oo); |
| return true; |
| } |
| |
| private boolean orderHasComplexExpr(OrderOperator oo) { |
| for (Pair<IOrder, Mutable<ILogicalExpression>> orderPair : oo.getOrderExpressions()) { |
| if (orderPair.second.getValue().getExpressionTag() != LogicalExpressionTag.VARIABLE) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } |