Package org.apache.calcite.sql.validate

Enum SqlMonotonicity

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Comparable<SqlMonotonicity>
    public enum SqlMonotonicity
extends java.lang.Enum<SqlMonotonicity>
    Enumeration of types of monotonicity.

    • Enum Constant Detail

      • STRICTLY_INCREASING

        public static final SqlMonotonicity STRICTLY_INCREASING

      • STRICTLY_DECREASING

        public static final SqlMonotonicity STRICTLY_DECREASING

      • MONOTONIC

        public static final SqlMonotonicity MONOTONIC
        Catch-all value for expressions that have some monotonic properties. Maybe it isn't known whether the expression is increasing or decreasing; or maybe the value is neither increasing nor decreasing but the value never repeats.

    • Constructor Detail

      • SqlMonotonicity

        private SqlMonotonicity()

    • Method Detail

      • values

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

      • valueOf

        public static SqlMonotonicity 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

      • unstrict

        public SqlMonotonicity unstrict()
        If this is a strict monotonicity (StrictlyIncreasing, StrictlyDecreasing) returns the non-strict equivalent (Increasing, Decreasing).
        Returns:
        non-strict equivalent monotonicity

      • reverse

        public SqlMonotonicity reverse()
        Returns the reverse monotonicity.
        Returns:
        reverse monotonicity

      • isDecreasing

        public boolean isDecreasing()
        Whether values of this monotonicity are decreasing. That is, if a value at a given point in a sequence is X, no point later in the sequence will have a value greater than X.
        Returns:
        whether values are decreasing

      • mayRepeat

        public boolean mayRepeat()
        Returns whether values of this monotonicity may ever repeat after moving to another value: true for NOT_MONOTONIC and CONSTANT, false otherwise.

        If a column is known not to repeat, a sort on that column can make progress before all of the input has been seen.

        Returns:
        whether values repeat