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

Class CardinalityRuleToolbox

java.lang.Object

org.apache.vxquery.compiler.rewriter.rules.util.CardinalityRuleToolbox

public class CardinalityRuleToolbox
extends Object

Constructor Summary

Constructors

Constructor	Description
CardinalityRuleToolbox()

Method Summary

Modifier and Type	Method	Description
static Cardinality	getProducerCardinality(org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator op, VXQueryOptimizationContext vxqueryContext)	Get the Cardinality variable of the parent operator.
static Cardinality	updateCardinalityVariable(org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator op, Cardinality cardinalityVariable, VXQueryOptimizationContext vxqueryContext)

Methods inherited from class java.lang.Object

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

Constructor Detail

CardinalityRuleToolbox

public CardinalityRuleToolbox()

Method Detail

getProducerCardinality

public static Cardinality getProducerCardinality(org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator op,
                                                 VXQueryOptimizationContext vxqueryContext)

Get the Cardinality variable of the parent operator.

Parameters:

op - Logical operator

vxqueryContext - VXQuery context

Returns:

Cardinality of the producer.

updateCardinalityVariable

public static Cardinality updateCardinalityVariable(org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator op,
                                                    Cardinality cardinalityVariable,
                                                    VXQueryOptimizationContext vxqueryContext)