Enum 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.
  • 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.

      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.
      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.)
      name - the name of the enum constant to be returned.
      the enum constant with the specified name
      IllegalArgumentException - if this enum type has no constant with the specified name
      NullPointerException - if the argument is null