RemoveUnusedTreatRule (VXQuery Core 0.5 API)

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

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

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

The rule searches for where the xquery treat function is used and determines if the treat is necessary. The plan is modified if any of these items is not required.

 Before
 
   plan__parent
   ASSIGN( $v1 : treat( $v0, \@type_expression ) )
   ASSIGN( $v0 : $$constant )
   plan__child
   
   Where $$constant is of \@type_expression.
   
 After 
 
   plan__parent
   ASSIGN( $v1 : $v0 )
   ASSIGN( $v0 : $$constant )
   plan__child

Author:: prestonc

Constructor Summary

Constructors
Constructor and Description

RemoveUnusedTreatRule()

Constructors
Constructor and Description
`RemoveUnusedTreatRule()`

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
- RemoveUnusedTreatRule
```
public RemoveUnusedTreatRule()
```

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)

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

Class RemoveUnusedTreatRule

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

RemoveUnusedTreatRule

Method Detail

rewritePre

rewritePost