Package org.apache.calcite.plan

Enum RelOptRuleOperandChildPolicy

java.lang.Object

java.lang.Enum<RelOptRuleOperandChildPolicy>

org.apache.calcite.plan.RelOptRuleOperandChildPolicy

All Implemented Interfaces:

Serializable, Comparable<RelOptRuleOperandChildPolicy>, Constable

public enum RelOptRuleOperandChildPolicy
extends Enum<RelOptRuleOperandChildPolicy>

Policy by which operands will be matched by relational expressions with any number of children.

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
ANY	Signifies that operand can have any number of children.
LEAF	Signifies that operand has no children.
SOME	Signifies that the operand's children must precisely match its child operands, in order.
UNORDERED	Signifies that the rule matches any one of its parents' children.

Method Summary

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

Enum Constant Details

ANY

public static final RelOptRuleOperandChildPolicy ANY

Signifies that operand can have any number of children.

LEAF

public static final RelOptRuleOperandChildPolicy LEAF

Signifies that operand has no children. Therefore it matches a leaf node, such as a table scan or VALUES operator.

RelOptRuleOperand(Foo.class, NONE) is equivalent to RelOptRuleOperand(Foo.class) but we prefer the former because it is more explicit.

SOME

public static final RelOptRuleOperandChildPolicy SOME

Signifies that the operand's children must precisely match its child operands, in order.

UNORDERED

public static final RelOptRuleOperandChildPolicy UNORDERED

Signifies that the rule matches any one of its parents' children. The parent may have one or more children.

Method Details

values

public static RelOptRuleOperandChildPolicy[] 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 RelOptRuleOperandChildPolicy 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