gudusoft.gsqlparser.ir.semantic.joinanalysis

Enum JoinSourceSyntax

Object

Enum<JoinSourceSyntax>

gudusoft.gsqlparser.ir.semantic.joinanalysis.JoinSourceSyntax

All Implemented Interfaces:

Serializable, Comparable<JoinSourceSyntax>

public enum JoinSourceSyntax
extends Enum<JoinSourceSyntax>

How a JoinEntity was written in the source SQL.

• EXPLICIT — a keyword join (JOIN ... ON, LEFT JOIN, CROSS JOIN, NATURAL JOIN, USING (...)).
• COMMA — a comma-FROM cross product (FROM a, b), modelled as SemanticJoinType.IMPLICIT_CROSS.
• LATERAL — a lateral join: SQL Server CROSS APPLY / OUTER APPLY (and reserved for ANSI LATERAL / PostgreSQL lateral). The right operand is correlated to the left; the join carries no ON/USING (the correlation lives inside the right operand). Pair with JoinEntity.isLateral().
• SEMI — a predicate-derived semi-join: an EXISTS / IN (or NOT EXISTS / NOT IN) subquery in a WHERE clause (R8), not a written FROM-clause join. Pair with SemanticJoinType.SEMI / SemanticJoinType.ANTI_SEMI.

Introduced by join-analysis slice 162 (S1).

Enum Constant Summary

Enum Constants

Enum Constant and Description
COMMA
EXPLICIT
LATERAL
SEMI

Method Summary

Modifier and Type	Method and Description
static JoinSourceSyntax	valueOf(String name) Returns the enum constant of this type with the specified name.
static JoinSourceSyntax[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class Enum

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

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

EXPLICIT

public static final JoinSourceSyntax EXPLICIT

COMMA

public static final JoinSourceSyntax COMMA

LATERAL

public static final JoinSourceSyntax LATERAL

SEMI

public static final JoinSourceSyntax SEMI

Method Detail

values

public static JoinSourceSyntax[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (JoinSourceSyntax c : JoinSourceSyntax.values())
    System.out.println(c);

Returns:

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

valueOf

public static JoinSourceSyntax 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