Enum sql::plan::typeconv::CastContext

pub enum CastContext {
    Implicit,
    Assignment,
    Explicit,
}

Describes the context of a cast.

Variants

Implicit

Implicit casts are “no-brainer” casts that apply automatically in expressions. They are typically lossless, such as ScalarType::Int32 to ScalarType::Int64.

Assignment

Assignment casts are “reasonable” casts that make sense to apply automatically in INSERT statements, but are surprising enough that they don’t apply implicitly in expressions.

Explicit

Explicit casts are casts that are possible but may be surprising, like casting ScalarType::Json to ScalarType::Int32, and therefore they do not happen unless explicitly requested by the user with a cast operator.

Trait Implementations

impl Clone for CastContext

fn clone(&self) -> CastContext

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CastContext

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

Formats the value using the given formatter.

impl PartialEq<CastContext> for CastContext

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Copy for CastContext

impl Eq for CastContext

impl StructuralEq for CastContext

impl StructuralPartialEq for CastContext