Package org.apache.calcite.plan

Enum RelOptRuleOperandChildPolicy

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<RelOptRuleOperandChildPolicy>
    public enum RelOptRuleOperandChildPolicy
extends java.lang.Enum<RelOptRuleOperandChildPolicy>
    Policy by which operands will be matched by relational expressions with any number of children.

    • 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

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static RelOptRuleOperandChildPolicy valueOf​(java.lang.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, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

      • Methods inherited from class java.lang.Object

        getClass, notify, notifyAll, wait, wait, wait

    • Enum Constant Detail

      • 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.

    • Constructor Detail

      • RelOptRuleOperandChildPolicy

        private RelOptRuleOperandChildPolicy()

    • Method Detail

      • values

        public static RelOptRuleOperandChildPolicy[] 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 (RelOptRuleOperandChildPolicy c : RelOptRuleOperandChildPolicy.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static RelOptRuleOperandChildPolicy valueOf​(java.lang.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:
        java.lang.IllegalArgumentException - if this enum type has no constant with the specified name
        java.lang.NullPointerException - if the argument is null