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

Class ConvertToAlgebricksExpressionsRule

java.lang.Object

org.apache.vxquery.compiler.rewriter.rules.ConvertToAlgebricksExpressionsRule

All Implemented Interfaces:

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

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

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

 Before
 
   plan__parent
   %OPERATOR( $v1 : xquery_expression( \@input_expression ) )
   plan__child
 
   where xquery_expression has a known equivalent in Algebricks,
     such as conditional expressions and a check for null.
     The expression may include the boolean function to ensure only
     a true or false result.
 
 After
 
   plan__parent
   %OPERATOR( $v1 : algebricks_function( \@input_expression ) )
   plan__child
 

Author:

prestonc, shivanim

Constructor Summary

Constructors

Constructor	Description
ConvertToAlgebricksExpressionsRule()

Method Summary

Modifier and Type	Method	Description
boolean	checkAllFunctionExpressions(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression> search, org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context)
boolean	convertFunctionToAlgebricksExpression(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression> searchM, org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression functionCall, org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context, Map<org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier,org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier> map)
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

ConvertToAlgebricksExpressionsRule

public ConvertToAlgebricksExpressionsRule()

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

convertFunctionToAlgebricksExpression

public boolean convertFunctionToAlgebricksExpression(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression> searchM,
                                                     org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression functionCall,
                                                     org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context,
                                                     Map<org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier,org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier> map)

checkAllFunctionExpressions

public boolean checkAllFunctionExpressions(org.apache.commons.lang3.mutable.Mutable<org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression> search,
                                           org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext context)