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

Class ConvertFromAlgebricksExpressionsRule

java.lang.Object

org.apache.vxquery.compiler.rewriter.rules.ConvertFromAlgebricksExpressionsRule

All Implemented Interfaces:

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

public class ConvertFromAlgebricksExpressionsRule
extends Object
implements org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

The rule searches for where the Algebricks builtin function are temporarly in the plan in place of XQuery function. The combination the Algebricks builtin function are replace with boolean XQuery function and the XQuery equivalent function.

 Before
 
   plan__parent
   %OPERATOR( $v1 : algebricks_function( \@input_expression ) )
   plan__child
 
   where the function annotation contains a hint on which xquery expression is represented by the algebricks function.
 
 After
 
   plan__parent
   %OPERATOR( $v1 :xquery_expression( \@input_expression ) ) )
   plan__child
 
   note the xquery_expression may include the boolean function to ensure only a true or false result.

 

Author:

prestonc, shivanim

Constructor Summary

Constructors

Constructor	Description
ConvertFromAlgebricksExpressionsRule()

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)
boolean	rewritePre(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 java.lang.Object

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

Constructor Detail

ConvertFromAlgebricksExpressionsRule

public ConvertFromAlgebricksExpressionsRule()

Method Detail

rewritePre

public boolean rewritePre(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

Specified by:

rewritePre in interface org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

Throws:

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

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

Specified by:

rewritePost in interface org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule

Throws:

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