Package org.apache.vxquery.compiler.rewriter.rules.algebricksalternatives

Class MoveFreeVariableOperatorOutOfSubplanRule

java.lang.Object

org.apache.hyracks.algebricks.rewriter.rules.AbstractDecorrelationRule

org.apache.vxquery.compiler.rewriter.rules.algebricksalternatives.MoveFreeVariableOperatorOutOfSubplanRule

All Implemented Interfaces:

org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

public class MoveFreeVariableOperatorOutOfSubplanRule
extends org.apache.hyracks.algebricks.rewriter.rules.AbstractDecorrelationRule

The rule searches for operators that can be moved outside the subplan.

 Before
 
   %PARENT_PLAN
   SUBPLAN{
     %NESTED_OPERATORS_B+
     ASSIGN || %SUBPLAN
     %NESTED_OPERATORS_A*
     NESTEDTUPLESOURCE
   }
   %CHILD_PLAN
 
   where
     %SUBPLAN has one nested plan with a root AGGREGATE operator.
 
 After
 
   %PARENT_PLAN
   SUBPLAN{
     %NESTED_OPERATORS_B+
     %NESTED_OPERATORS_A*
     NESTEDTUPLESOURCE
   }
   ASSIGN || %SUBPLAN
   %CHILD_PLAN
 

Constructor Summary

Constructors

Constructor	Description
MoveFreeVariableOperatorOutOfSubplanRule()

Method Summary

Modifier and Type	Method	Description
boolean	rewritePost(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator> opRef, org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context)

Methods inherited from class org.apache.hyracks.algebricks.rewriter.rules.AbstractDecorrelationRule

buildVarExprList, computeGbyVarsUsingPksOnly, descOrSelfIsScanOrJoin, isScanOrJoin, rewritePre

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MoveFreeVariableOperatorOutOfSubplanRule

public MoveFreeVariableOperatorOutOfSubplanRule()

Method Detail

rewritePost

public boolean rewritePost(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator> opRef,
                           org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context)
                    throws org.apache.hyracks.algebricks.common.exceptions.AlgebricksException

Throws:

org.apache.hyracks.algebricks.common.exceptions.AlgebricksException