PushMapOperatorDownThroughProductRule (VXQuery Core 0.4 API)

java.lang.Object
- org.apache.vxquery.compiler.rewriter.rules.PushMapOperatorDownThroughProductRule

All Implemented Interfaces:: edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

public class PushMapOperatorDownThroughProductRule
extends Object
implements edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

The rule searches for an inner join operator followed by a map operator. When the map operator only uses variable generated by one side of the join, the operator is pushed down through the product rule.

 Before
 
   %PARENT_PLAN
   ASSIGN | EXCHANGE | SELECT | UNNEST
   INNERJOIN( true )
   {
      %RIGHT_BRANCH_PLAN
   }
   {
      %LEFT_BRANCH_PLAN
   }
   %CHILD_PLAN
   
   Where ASSIGN | EXCHANGE | SELECT | UNNEST are operators with the map 
   property.
   
 After
 
   When all variables used in ASSIGN | EXCHANGE | SELECT | UNNEST exist in 
   %RIGHT_BRANCH_PLAN.
 
   %PARENT_PLAN
   INNERJOIN( true )
   {
      ASSIGN | EXCHANGE | SELECT | UNNEST
      %RIGHT_BRANCH_PLAN
   }
   {
      %LEFT_BRANCH_PLAN
   }
   %CHILD_PLAN
   
   When all variables used in ASSIGN | EXCHANGE | SELECT | UNNEST exist in 
   %LEFT_BRANCH_PLAN.
 
   %PARENT_PLAN
   INNERJOIN( true )
   {
      %RIGHT_BRANCH_PLAN
   }
   {
      ASSIGN | EXCHANGE | SELECT | UNNEST
      %LEFT_BRANCH_PLAN
   }
   %CHILD_PLAN

Constructor Summary

Constructors
Constructor and Description

PushMapOperatorDownThroughProductRule()

Constructors
Constructor and Description
`PushMapOperatorDownThroughProductRule()`

Method Summary

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

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- PushMapOperatorDownThroughProductRule
```
public PushMapOperatorDownThroughProductRule()
```

Method Detail

rewritePre

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

Specified by:: rewritePre in interface edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule
Throws:: edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException

rewritePost

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

Specified by:: rewritePost in interface edu.uci.ics.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule
Throws:: edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException

Class PushMapOperatorDownThroughProductRule

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

PushMapOperatorDownThroughProductRule

Method Detail

rewritePre

rewritePost