Package org.apache.calcite.sql

Enum JoinType

java.lang.Object

java.lang.Enum<JoinType>

org.apache.calcite.sql.JoinType

All Implemented Interfaces:

Serializable, Comparable<JoinType>, Constable, Symbolizable

public enum JoinType
extends Enum<JoinType>
implements Symbolizable

Enumerates the types of join.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
COMMA	Comma join: the good old-fashioned SQL FROM clause, where table expressions are specified with commas between them, and join conditions are specified in the WHERE clause.
CROSS	Cross join (also known as Cartesian product).
FULL	Full outer join.
INNER	Inner join.
LEFT	Left outer join.
LEFT_ANTI_JOIN	Left anti join.
LEFT_SEMI_JOIN	Left semi join.
RIGHT	Right outer join.

Field Summary

Fields

Modifier and Type	Field	Description
final String	lowerName	Lower-case name.

Method Summary

Modifier and Type	Method	Description
boolean	generatesNullsOnLeft()	Returns whether a join of this type may generate NULL values on the left-hand side.
boolean	generatesNullsOnRight()	Returns whether a join of this type may generate NULL values on the right-hand side.
static JoinType	valueOf(String name)	Returns the enum constant of this type with the specified name.
static JoinType[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.calcite.sql.Symbolizable

symbol

Enum Constant Details

INNER

public static final JoinType INNER

Inner join.

FULL

public static final JoinType FULL

Full outer join.

CROSS

public static final JoinType CROSS

Cross join (also known as Cartesian product).

LEFT

public static final JoinType LEFT

Left outer join.

RIGHT

public static final JoinType RIGHT

Right outer join.

LEFT_SEMI_JOIN

public static final JoinType LEFT_SEMI_JOIN

Left semi join.

Not used by Calcite; only in Babel's Hive dialect.

LEFT_ANTI_JOIN

public static final JoinType LEFT_ANTI_JOIN

Left anti join.

Not used by Calcite; only in Babel's Spark dialect.

COMMA

public static final JoinType COMMA

Comma join: the good old-fashioned SQL FROM clause, where table expressions are specified with commas between them, and join conditions are specified in the WHERE clause.

Field Details

lowerName

public final String lowerName

Lower-case name.

Method Details

values

public static JoinType[] values()

Returns an array containing the constants of this enum type, in the order they are declared.

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static JoinType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

generatesNullsOnLeft

public boolean generatesNullsOnLeft()

Returns whether a join of this type may generate NULL values on the left-hand side.

generatesNullsOnRight

public boolean generatesNullsOnRight()

Returns whether a join of this type may generate NULL values on the right-hand side.