gudusoft.gsqlparser.ir.semantic.joinanalysis

Class JoinGraph

Object

gudusoft.gsqlparser.ir.semantic.joinanalysis.JoinGraph

public final class JoinGraph
extends Object

An ordered list of JoinEntitys for one query block (GAP 1). Order follows the written join order; for a left-deep chain entity n's leftEndpoint references the JoinEndpointKind.JOIN_RESULT produced by entity n-1.

Immutable. Introduced by join-analysis slice 162 (S1).

Field Summary

Fields

Modifier and Type	Field and Description
static JoinGraph	EMPTY Shared empty graph for blocks with no joins.

Constructor Summary

Constructors

Constructor and Description
JoinGraph(List<JoinEntity> joins)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
List<JoinEntity>	getJoins() Never null; empty when the block has no joins.
int	hashCode()
boolean	isEmpty()
String	toString()

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY

public static final JoinGraph EMPTY

Shared empty graph for blocks with no joins.

Constructor Detail

JoinGraph

public JoinGraph(List<JoinEntity> joins)

Method Detail

getJoins

public List<JoinEntity> getJoins()

Never null; empty when the block has no joins.

isEmpty

public boolean isEmpty()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object