org.apache.calcite.plan.volcano

Class RuleQueue.RuleMatchImportanceComparator

java.lang.Object

org.apache.calcite.plan.volcano.RuleQueue.RuleMatchImportanceComparator

All Implemented Interfaces:

Comparator<VolcanoRuleMatch>

Enclosing class:

RuleQueue

private static class RuleQueue.RuleMatchImportanceComparator
extends Object
implements Comparator<VolcanoRuleMatch>

Compares VolcanoRuleMatch objects according to their importance. Matches which are more important collate earlier. Ties are adjudicated by comparing the ids of the relational expressions matched.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RuleMatchImportanceComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(VolcanoRuleMatch match1, VolcanoRuleMatch match2)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

RuleMatchImportanceComparator

private RuleMatchImportanceComparator()

Method Detail

compare

public int compare(VolcanoRuleMatch match1,
                   VolcanoRuleMatch match2)

Specified by:

compare in interface Comparator<VolcanoRuleMatch>