Struct mz_sql::session::vars::VarDefinition
source · pub struct VarDefinition {
pub name: &'static UncasedStr,
pub description: &'static str,
pub internal: bool,
pub value: VarDefaultValue,
pub constraint: Option<ValueConstraint>,
pub feature_flag: Option<&'static FeatureFlag>,
/* private fields */
}
Expand description
Definition of a variable.
Fields§
§name: &'static UncasedStr
Name of the variable, case-insensitive matching.
description: &'static str
Description of the variable.
internal: bool
TODO(parkmcar): What does internal mean?
value: VarDefaultValue
Default compiled in value for this variable.
constraint: Option<ValueConstraint>
Constraint that must be upheld for this variable to be valid.
feature_flag: Option<&'static FeatureFlag>
Optionally hides this variable if it’s related to a feature flag being enabled.
Implementations§
source§impl VarDefinition
impl VarDefinition
pub const fn new<V: Value>( name: &'static str, value: &'static V, description: &'static str, internal: bool ) -> Self
pub const fn new_lazy<V: Value, L: LazyValueFn<V>>( name: &'static str, _value: L, description: &'static str, internal: bool ) -> Self
pub fn new_runtime<V: Value>( name: &'static str, value: V, description: &'static str, internal: bool ) -> Self
sourcepub const fn with_constraint<V: Value, D: DomainConstraint<Value = V>>(
self,
constraint: &'static D
) -> Self
pub const fn with_constraint<V: Value, D: DomainConstraint<Value = V>>( self, constraint: &'static D ) -> Self
TODO(parkmycar): Refactor this method onto a VarDefinitionBuilder
that would allow us to
constrain V
here to be the same V
used in VarDefinition::new
.
pub const fn fixed(self) -> Self
pub const fn read_only(self) -> Self
pub const fn with_feature_flag(self, feature_flag: &'static FeatureFlag) -> Self
pub fn parse(&self, input: VarInput<'_>) -> Result<Box<dyn Value>, VarError>
pub fn default_value(&self) -> &dyn Value
Trait Implementations§
source§impl Clone for VarDefinition
impl Clone for VarDefinition
source§fn clone(&self) -> VarDefinition
fn clone(&self) -> VarDefinition
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl Debug for VarDefinition
impl Debug for VarDefinition
source§impl Var for VarDefinition
impl Var for VarDefinition
source§fn value(&self) -> String
fn value(&self) -> String
Constructs a flattened string representation of the current value of the
configuration parameter. Read more
source§fn description(&self) -> &'static str
fn description(&self) -> &'static str
Returns a short sentence describing the purpose of the configuration
parameter.
Auto Trait Implementations§
impl Freeze for VarDefinition
impl !RefUnwindSafe for VarDefinition
impl Send for VarDefinition
impl Sync for VarDefinition
impl Unpin for VarDefinition
impl !UnwindSafe for VarDefinition
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source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<R, O, T> CopyOnto<ConsecutiveOffsetPairs<R, O>> for T
impl<R, O, T> CopyOnto<ConsecutiveOffsetPairs<R, O>> for T
source§fn copy_onto(
self,
target: &mut ConsecutiveOffsetPairs<R, O>
) -> <ConsecutiveOffsetPairs<R, O> as Region>::Index
fn copy_onto( self, target: &mut ConsecutiveOffsetPairs<R, O> ) -> <ConsecutiveOffsetPairs<R, O> as Region>::Index
Copy self into the target container, returning an index that allows to
look up the corresponding read item.
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impl<T> FmtForward for T
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-formatted.source§impl<T> FutureExt for T
impl<T> FutureExt for T
source§fn with_context(self, otel_cx: Context) -> WithContext<Self>
fn with_context(self, otel_cx: Context) -> WithContext<Self>
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impl<T> Instrument for T
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fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoRequest<T> for T
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fn into_request(self) -> Request<T>
Wrap the input message
T
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Creates a shared type from an unshared type.
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