gudusoft.gsqlparser.ir.semantic.diff

Enum EdgeRole

Object

Enum<EdgeRole>

gudusoft.gsqlparser.ir.semantic.diff.EdgeRole

All Implemented Interfaces:

Serializable, Comparable<EdgeRole>

public enum EdgeRole
extends Enum<EdgeRole>

Classification of a CanonicalLineageEdge. Slice 7 records three roles:

• SELECT — output column receives data from the base column.
• FILTER — base column appears in a WHERE predicate reachable from the outer query.
• JOIN — base column appears in a JOIN predicate (JOIN ... ON or JOIN ... USING) reachable from the outer query.

GROUP_BY is intentionally absent in slice 7. See the slice-7 design at docs/designs/sql-semantic-governance-unified-roadmap.md §13 step 5 (and the slice-7 plan) for the rationale.

Enum Constant Summary

Enum Constants

Enum Constant and Description
FILTER
JOIN
SELECT

Method Summary

Modifier and Type	Method and Description
static EdgeRole	valueOf(String name) Returns the enum constant of this type with the specified name.
static EdgeRole[]	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

SELECT

public static final EdgeRole SELECT

FILTER

public static final EdgeRole FILTER

JOIN

public static final EdgeRole JOIN

Method Detail

values

public static EdgeRole[] 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 (EdgeRole c : EdgeRole.values())
    System.out.println(c);

Returns:

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

valueOf

public static EdgeRole 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