Enum Aggregate.FinishEffect

  • All Implemented Interfaces:
    Serializable, Comparable<Aggregate.FinishEffect>, Constable
    Enclosing class:

    public static enum Aggregate.FinishEffect
    extends Enum<Aggregate.FinishEffect>
    Declares the effect of the finish function in a Plan.

    If READ_ONLY, PostgreSQL can continue updating the same state with additional rows, and call the finisher again for updated results.

    If SHAREABLE, the state cannot be further updated after a finisher call, but finishers for other aggregates that use the same state representation (and are also SHAREABLE) can be called to produce the results for those aggregates. An example could be the several linear-regression-related aggregates, all of which can work from a state that contains the count of values, sum of values, and sum of squares.

    If READ_WRITE, no further use can be made of the state after the finisher has run.

    • Method Detail

      • values

        public static Aggregate.FinishEffect[] 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 Aggregate.FinishEffect 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