Enum mz_sql::plan::typeconv::CastContext
source · pub enum CastContext {
Implicit,
Assignment,
Explicit,
Coerced,
}
Expand description
Describes the context of a cast.
n.b. this type derived Ord, PartialOrd
and the ordering of these values
has semantics meaning; casts are only permitted when the caller’s cast
context is geq the ccx we store, which is the minimum required context.
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.
Coerced
Coerced casts permit different behavior when a type is coerced from a
string literal vs. a value of type pg_catalog::text
.
The only call site that should pass this value in to this module is string coercion.
Trait Implementations§
source§impl Clone for CastContext
impl Clone for CastContext
source§fn clone(&self) -> CastContext
fn clone(&self) -> CastContext
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for CastContext
impl Debug for CastContext
source§impl Ord for CastContext
impl Ord for CastContext
source§fn cmp(&self, other: &CastContext) -> Ordering
fn cmp(&self, other: &CastContext) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere Self: Sized,
source§impl PartialEq for CastContext
impl PartialEq for CastContext
source§fn eq(&self, other: &CastContext) -> bool
fn eq(&self, other: &CastContext) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for CastContext
impl PartialOrd for CastContext
source§fn partial_cmp(&self, other: &CastContext) -> Option<Ordering>
fn partial_cmp(&self, other: &CastContext) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Copy for CastContext
impl Eq for CastContext
impl StructuralEq for CastContext
impl StructuralPartialEq for CastContext
Auto Trait Implementations§
impl RefUnwindSafe for CastContext
impl Send for CastContext
impl Sync for CastContext
impl Unpin for CastContext
impl UnwindSafe for CastContext
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