Enum ScalarSchemaSafety 

pub enum ScalarSchemaSafety {
    Always,
    Never,
    DateTimeConditional,
}

Frozen policy governing use of a scalar function in schema-maintained expressions such as indexes, generated columns, and CHECK constraints.

This metadata belongs to the registry entry, not the open ScalarFunction trait object. Consequently a user-defined function can neither re-enter registration nor contradict the explicit deterministic / non-deterministic API while rows are being evaluated.

Variants

Always

Every invocation is stable for the lifetime of the schema.

Never

No invocation is permitted in a schema-maintained expression.

DateTimeConditional

The sealed built-in date/time classifier must inspect evaluated values.

Trait Implementations

impl Clone for ScalarSchemaSafety

fn clone(&self) -> ScalarSchemaSafety

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ScalarSchemaSafety

impl Debug for ScalarSchemaSafety

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ScalarSchemaSafety

impl PartialEq for ScalarSchemaSafety

fn eq(&self, other: &ScalarSchemaSafety) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ScalarSchemaSafety