Package org.apache.druid.segment.virtual

Enum ExpressionPlan.Trait

    • Enum Constant Detail

      • CONSTANT

        public static final ExpressionPlan.Trait CONSTANT
        expression has no inputs and can be optimized into a constant selector

      • IDENTIFIER

        public static final ExpressionPlan.Trait IDENTIFIER
        expression is a simple identifier expression, do not transform

      • SINGLE_INPUT_SCALAR

        public static final ExpressionPlan.Trait SINGLE_INPUT_SCALAR
        expression has a single, single valued input, and is dictionary encoded if the value is a string, and does not produce non-scalar output

      • SINGLE_INPUT_MAPPABLE

        public static final ExpressionPlan.Trait SINGLE_INPUT_MAPPABLE
        expression has a single input, which may produce single or multi-valued output, but if so, it must be implicitly mappable (i.e. the expression is not treating its input as an array and does not produce non-scalar output)

      • NEEDS_APPLIED

        public static final ExpressionPlan.Trait NEEDS_APPLIED
        expression must be implicitly mapped across the multiple values per row of known multi-value inputs, the final output will be multi-valued

      • UNKNOWN_INPUTS

        public static final ExpressionPlan.Trait UNKNOWN_INPUTS
        expression has inputs whose type was unresolveable

      • INCOMPLETE_INPUTS

        public static final ExpressionPlan.Trait INCOMPLETE_INPUTS
        expression has inputs whose type was incomplete, such as unknown multi-valuedness, which are not explicitly used as possibly multi-valued/array inputs

      • NON_SCALAR_INPUTS

        public static final ExpressionPlan.Trait NON_SCALAR_INPUTS
        expression explicitly using multi-valued inputs as array inputs or has array inputs

      • NON_SCALAR_OUTPUT

        public static final ExpressionPlan.Trait NON_SCALAR_OUTPUT
        expression produces explict multi-valued output

    • Method Detail

      • values

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

      • valueOf

        public static ExpressionPlan.Trait 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