simpledb

Class LogicalJoinNode

java.lang.Object

simpledb.LogicalJoinNode

Direct Known Subclasses:

LogicalSubplanJoinNode

public class LogicalJoinNode
extends java.lang.Object

A LogicalJoinNode represens the state needed of a join of two tables in a LogicalQueryPlan

Field Summary

Fields

Modifier and Type	Field and Description
java.lang.String	f1PureName The name of the field in t1 to join with.
java.lang.String	f1QuantifiedName
java.lang.String	f2PureName The name of the field in t2 to join with.
java.lang.String	f2QuantifiedName
Predicate.Op	p The join predicate
java.lang.String	t1Alias The first table to join (may be null).
java.lang.String	t2Alias The second table to join (may be null).

Constructor Summary

Constructors

Constructor and Description
LogicalJoinNode()
LogicalJoinNode(java.lang.String table1, java.lang.String table2, java.lang.String joinField1, java.lang.String joinField2, Predicate.Op pred)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
int	hashCode()
LogicalJoinNode	swapInnerOuter() Return a new LogicalJoinNode with the inner and outer (t1.f1 and t2.f2) tables swapped.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

t1Alias

public java.lang.String t1Alias

The first table to join (may be null). It's the alias of the table (if no alias, the true table name)

t2Alias

public java.lang.String t2Alias

The second table to join (may be null). It's the alias of the table, (if no alias, the true table name).

f1PureName

public java.lang.String f1PureName

The name of the field in t1 to join with. It's the pure name of a field, rather that alias.field.

f1QuantifiedName

public java.lang.String f1QuantifiedName

f2PureName

public java.lang.String f2PureName

The name of the field in t2 to join with. It's the pure name of a field.

f2QuantifiedName

public java.lang.String f2QuantifiedName

p

public Predicate.Op p

The join predicate

Constructor Detail

LogicalJoinNode

public LogicalJoinNode()

LogicalJoinNode

public LogicalJoinNode(java.lang.String table1,
                       java.lang.String table2,
                       java.lang.String joinField1,
                       java.lang.String joinField2,
                       Predicate.Op pred)

Method Detail

swapInnerOuter

public LogicalJoinNode swapInnerOuter()

Return a new LogicalJoinNode with the inner and outer (t1.f1 and t2.f2) tables swapped.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object