com.bigdata.rdf.sparql.ast.explainhints

Class JoinOrderExplainHint

java.lang.Object

com.bigdata.rdf.sparql.ast.explainhints.ExplainHint

com.bigdata.rdf.sparql.ast.explainhints.JoinOrderExplainHint

All Implemented Interfaces:

IExplainHint

public class JoinOrderExplainHint
extends ExplainHint

Explain hint indicating potential problems caused by the join order within a given join group, such as non-optional non-minus nodes that could not be moved in front of optionals. Such constructs are often undesired and may cause performance bottlenecks.

Version:

$Id$

Author:

Michael Schmidt

Nested Class Summary

Nested classes/interfaces inherited from interface com.bigdata.rdf.sparql.ast.explainhints.IExplainHint

IExplainHint.ExplainHintCategory, IExplainHint.ExplainHintSeverity

Field Summary

Fields

Modifier and Type	Field and Description
static String	ACROSS_PARTITION_REORDERING_PROBLEM

Constructor Summary

Constructors

Constructor and Description
JoinOrderExplainHint(String explainHintDescription, IGroupMemberNode candidate)

Method Summary

Methods inherited from class com.bigdata.rdf.sparql.ast.explainhints.ExplainHint

getExplainHintCategory, getExplainHintDescription, getExplainHintNode, getExplainHintSeverity, getExplainHintType, getHelpLink, toString

Methods inherited from class java.lang.Object

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

Field Detail

ACROSS_PARTITION_REORDERING_PROBLEM

public static final String ACROSS_PARTITION_REORDERING_PROBLEM

See Also:

Constant Field Values

Constructor Detail

JoinOrderExplainHint

public JoinOrderExplainHint(String explainHintDescription,
                    IGroupMemberNode candidate)