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

Class AbstractUsedVariablesProcessingRule

java.lang.Object

org.apache.vxquery.compiler.rewriter.rules.AbstractUsedVariablesProcessingRule

All Implemented Interfaces:

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

Direct Known Subclasses:

ConsolidateUnnestsRule, ConvertAssignToUnnestRule, PushChildIntoDataScanRule, RemoveUnusedUnnestIterateRule

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

The AbstractUsedVariablesProcessingRule provides a frame work to track used variables to assist in some rewrite rules that must track used variables in the above plan.

Author:

prestonc

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	hasRun
protected List<org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable>	usedVariables

Constructor Summary

Constructors

Constructor	Description
AbstractUsedVariablesProcessingRule()

Method Summary

Modifier and Type	Method	Description
protected abstract boolean	processOperator(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	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)
protected boolean	rewritePreTrackingUsedVariables(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

Field Detail

usedVariables

protected List<org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable> usedVariables

hasRun

protected boolean hasRun

Constructor Detail

AbstractUsedVariablesProcessingRule

public AbstractUsedVariablesProcessingRule()

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

Specified by:

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

Throws:

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

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

rewritePreTrackingUsedVariables

protected boolean rewritePreTrackingUsedVariables(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

processOperator

protected abstract boolean processOperator(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