| /* |
| * 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.core.algebra.operators.physical; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.IHyracksJobBuilder; |
| 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.PhysicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IExpressionRuntimeProvider; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.IOperatorSchema; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical.LimitOperator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningProperty; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPartitioningRequirementsCoordinator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.IPhysicalPropertiesVector; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.PhysicalRequirements; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.StructuralPropertiesVector; |
| import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenContext; |
| import edu.uci.ics.hyracks.algebricks.core.jobgen.impl.JobGenHelper; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory; |
| import edu.uci.ics.hyracks.algebricks.runtime.operators.std.StreamLimitRuntimeFactory; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| |
| public class StreamLimitPOperator extends AbstractPhysicalOperator { |
| |
| public StreamLimitPOperator() { |
| |
| } |
| |
| @Override |
| public PhysicalOperatorTag getOperatorTag() { |
| return PhysicalOperatorTag.STREAM_LIMIT; |
| } |
| |
| @Override |
| public boolean isMicroOperator() { |
| return true; |
| } |
| |
| @Override |
| public void computeDeliveredProperties(ILogicalOperator op, IOptimizationContext context) { |
| AbstractLogicalOperator limitOp = (AbstractLogicalOperator) op; |
| ILogicalOperator op2 = op.getInputs().get(0).getValue(); |
| if (limitOp.getExecutionMode() == AbstractLogicalOperator.ExecutionMode.UNPARTITIONED) { |
| //partitioning property: unpartitioned; local property: whatever from the child |
| deliveredProperties = new StructuralPropertiesVector(IPartitioningProperty.UNPARTITIONED, op2 |
| .getDeliveredPhysicalProperties().getLocalProperties()); |
| } else { |
| deliveredProperties = op2.getDeliveredPhysicalProperties().clone(); |
| } |
| } |
| |
| @Override |
| public PhysicalRequirements getRequiredPropertiesForChildren(ILogicalOperator op, |
| IPhysicalPropertiesVector reqdByParent) { |
| AbstractLogicalOperator limitOp = (AbstractLogicalOperator) op; |
| if (limitOp.getExecutionMode() == AbstractLogicalOperator.ExecutionMode.UNPARTITIONED) { |
| StructuralPropertiesVector[] pv = new StructuralPropertiesVector[1]; |
| pv[0] = new StructuralPropertiesVector(IPartitioningProperty.UNPARTITIONED, null); |
| return new PhysicalRequirements(pv, IPartitioningRequirementsCoordinator.NO_COORDINATION); |
| } else { |
| return emptyUnaryRequirements(); |
| } |
| } |
| |
| @Override |
| public void contributeRuntimeOperator(IHyracksJobBuilder builder, JobGenContext context, ILogicalOperator op, |
| IOperatorSchema propagatedSchema, IOperatorSchema[] inputSchemas, IOperatorSchema outerPlanSchema) |
| throws AlgebricksException { |
| LimitOperator limit = (LimitOperator) op; |
| IExpressionRuntimeProvider expressionRuntimeProvider = context.getExpressionRuntimeProvider(); |
| IVariableTypeEnvironment env = context.getTypeEnvironment(op); |
| IScalarEvaluatorFactory maxObjectsFact = expressionRuntimeProvider.createEvaluatorFactory(limit.getMaxObjects() |
| .getValue(), env, inputSchemas, context); |
| ILogicalExpression offsetExpr = limit.getOffset().getValue(); |
| IScalarEvaluatorFactory offsetFact = (offsetExpr == null) ? null : expressionRuntimeProvider |
| .createEvaluatorFactory(offsetExpr, env, inputSchemas, context); |
| RecordDescriptor recDesc = JobGenHelper.mkRecordDescriptor(context.getTypeEnvironment(op), propagatedSchema, |
| context); |
| StreamLimitRuntimeFactory runtime = new StreamLimitRuntimeFactory(maxObjectsFact, offsetFact, null, |
| context.getBinaryIntegerInspectorFactory()); |
| builder.contributeMicroOperator(limit, runtime, recDesc); |
| // and contribute one edge from its child |
| ILogicalOperator src = limit.getInputs().get(0).getValue(); |
| builder.contributeGraphEdge(src, 0, limit, 0); |
| } |
| |
| } |