Enum tidb_query_datatype::codec::data_type::ScalarValue[−][src]

pub enum ScalarValue {
    Int(Option<Int>),
    Real(Option<Real>),
    Decimal(Option<Decimal>),
    Bytes(Option<Bytes>),
    DateTime(Option<DateTime>),
    Duration(Option<Duration>),
    Json(Option<Json>),
    Enum(Option<Enum>),
    Set(Option<Set>),
}

A scalar value container, a.k.a. datum, for all concrete eval types.

In many cases, for example, at the framework level, the concrete eval type is unknown at compile time. So we use this enum container to represent types dynamically. It is similar to trait object Box<T> where T is a concrete eval type but faster.

Like VectorValue, the inner concrete value is immutable.

Compared to VectorValue, it only contains a single concrete value. Compared to Datum, it is a newer encapsulation that naturally wraps Option<..>.

TODO: Once we removed the Option<..> wrapper, it will be much like Datum. At that time, we only need to preserve one of them.

Variants

Int(Option<Int>)

Real(Option<Real>)

Decimal(Option<Decimal>)

Bytes(Option<Bytes>)

DateTime(Option<DateTime>)

Duration(Option<Duration>)

Json(Option<Json>)

Enum(Option<Enum>)

Set(Option<Set>)

Implementations

`impl ScalarValue`[src]

`pub fn eval_type(&self) -> EvalType`[src]

`pub fn as_scalar_value_ref(&self) -> ScalarValueRef<'_>`[src]

`pub fn is_none(&self) -> bool`[src]

`pub fn is_some(&self) -> bool`[src]

`impl ScalarValue`[src]

`pub fn as_int(&self) -> Option<&Int>`[src]

`impl ScalarValue`[src]

`pub fn as_real(&self) -> Option<&Real>`[src]

`impl ScalarValue`[src]

`pub fn as_decimal(&self) -> Option<&Decimal>`[src]

`impl ScalarValue`[src]

`pub fn as_date_time(&self) -> Option<&DateTime>`[src]

`impl ScalarValue`[src]

`pub fn as_duration(&self) -> Option<&Duration>`[src]

`impl ScalarValue`[src]

`pub fn as_json(&self) -> Option<JsonRef<'_>>`[src]

`impl ScalarValue`[src]

`pub fn as_bytes(&self) -> Option<BytesRef<'_>>`[src]

Trait Implementations

`impl AsMySQLBool for ScalarValue`[src]

`fn as_mysql_bool(&self, context: &mut EvalContext) -> Result<bool>`[src]

`impl Clone for ScalarValue`[src]

`fn clone(&self) -> ScalarValue`[src]

`pub fn clone_from(&mut self, source: &Self)`1.0.0 [src]

`impl Debug for ScalarValue`[src]

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

`impl From<Decimal> for ScalarValue`[src]

`fn from(s: Decimal) -> ScalarValue`[src]

`impl From<Duration> for ScalarValue`[src]

`fn from(s: Duration) -> ScalarValue`[src]

`impl From<Json> for ScalarValue`[src]

`fn from(s: Json) -> ScalarValue`[src]

`impl From<NotNan<f64>> for ScalarValue`[src]

`fn from(s: Real) -> ScalarValue`[src]

`impl<'a> From<Option<&'a [u8]>> for ScalarValue`[src]

`fn from(s: Option<BytesRef<'a>>) -> ScalarValue`[src]

`impl From<Option<Decimal>> for ScalarValue`[src]

`fn from(s: Option<Decimal>) -> ScalarValue`[src]

`impl From<Option<Duration>> for ScalarValue`[src]

`fn from(s: Option<Duration>) -> ScalarValue`[src]

`impl From<Option<Json>> for ScalarValue`[src]

`fn from(s: Option<Json>) -> ScalarValue`[src]

`impl<'a> From<Option<JsonRef<'a>>> for ScalarValue`[src]

`fn from(s: Option<JsonRef<'a>>) -> ScalarValue`[src]

`impl From<Option<NotNan<f64>>> for ScalarValue`[src]

`fn from(s: Option<Real>) -> ScalarValue`[src]

`impl From<Option<Time>> for ScalarValue`[src]

`fn from(s: Option<DateTime>) -> ScalarValue`[src]

`impl From<Option<Vec<u8, Global>>> for ScalarValue`[src]

`fn from(s: Option<Bytes>) -> ScalarValue`[src]

`impl From<Option<f64>> for ScalarValue`[src]

`fn from(s: Option<f64>) -> ScalarValue`[src]

`impl From<Option<i64>> for ScalarValue`[src]

`fn from(s: Option<Int>) -> ScalarValue`[src]

`impl From<Time> for ScalarValue`[src]

`fn from(s: DateTime) -> ScalarValue`[src]

`impl From<Vec<u8, Global>> for ScalarValue`[src]

`fn from(s: Bytes) -> ScalarValue`[src]

`impl From<f64> for ScalarValue`[src]

`fn from(s: f64) -> ScalarValue`[src]

`impl From<i64> for ScalarValue`[src]

`fn from(s: Int) -> ScalarValue`[src]

`impl PartialEq<ScalarValue> for ScalarValue`[src]

`fn eq(&self, other: &ScalarValue) -> bool`[src]

`fn ne(&self, other: &ScalarValue) -> bool`[src]

`impl<'a> PartialEq<ScalarValue> for ScalarValueRef<'a>`[src]

`fn eq(&self, other: &ScalarValue) -> bool`[src]

`#[must_use]pub fn ne(&self, other: &Rhs) -> bool`1.0.0 [src]

`impl<'a> PartialEq<ScalarValueRef<'a>> for ScalarValue`[src]

`fn eq(&self, other: &ScalarValueRef<'_>) -> bool`[src]

`#[must_use]pub fn ne(&self, other: &Rhs) -> bool`1.0.0 [src]

`impl StructuralPartialEq for ScalarValue`[src]

Auto Trait Implementations

`impl RefUnwindSafe for ScalarValue`

`impl Send for ScalarValue`

`impl Sync for ScalarValue`

`impl Unpin for ScalarValue`

`impl UnwindSafe for ScalarValue`

Blanket Implementations

`impl<T> Any for T where T: 'static + ?Sized,` [src]

`pub fn type_id(&self) -> TypeId`[src]

`impl<T> Borrow<T> for T where T: ?Sized,` [src]

`pub fn borrow(&self) -> &T`[src]

`impl<T> BorrowMut<T> for T where T: ?Sized,` [src]

`pub fn borrow_mut(&mut self) -> &mut T`[src]

`impl<V, W> ConvertFrom<W> for V where W: ConvertTo<V>,` [src]

`pub fn convert_from(&mut EvalContext, W) -> Result<V, Error>`[src]

`impl<T> From<T> for T`[src]

`pub fn from(t: T) -> T`[src]

`impl<T> Instrument for T`[src]

`pub fn instrument(self, span: Span) -> Instrumented<Self>`[src]

`pub fn in_current_span(self) -> Instrumented<Self>`[src]

`impl<T, U> Into<U> for T where U: From<T>,` [src]

`pub fn into(self) -> U`[src]

`impl<T> Pointable for T`[src]

`pub const ALIGN: usize`[src]

`type Init = T`

The type for initializers.

`pub unsafe fn init(init: <T as Pointable>::Init) -> usize`[src]

`pub unsafe fn deref<'a>(ptr: usize) -> &'a T`[src]

`pub unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T`[src]

`pub unsafe fn drop(ptr: usize)`[src]

`impl<T> Same<T> for T`[src]

`type Output = T`

Should always be Self

`impl<T> Sealed<T> for T where T: ?Sized,` [src]

`impl<T> SendSyncUnwindSafe for T where T: Send + Sync + UnwindSafe + ?Sized,` [src]

`impl<T> ToOwned for T where T: Clone,` [src]

`type Owned = T`

The resulting type after obtaining ownership.

`pub fn to_owned(&self) -> T`[src]

`pub fn clone_into(&self, target: &mut T)`[src]

`impl<T, U> TryFrom<U> for T where U: Into<T>,` [src]

`type Error = Infallible`

The type returned in the event of a conversion error.

`pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

`impl<T, U> TryInto<U> for T where U: TryFrom<T>,` [src]

`type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

`pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

`impl<V, T> VZip<V> for T where V: MultiLane<T>,` [src]

`pub fn vzip(self) -> V`[src]