Enum ColumnDefaultConstraint 

pub enum ColumnDefaultConstraint {
    Function(String),
    Value(Value),
}

Column’s default constraint.

Variants

Function(String)

Value(Value)

Implementations

impl ColumnDefaultConstraint

pub fn null_value() -> ColumnDefaultConstraint

Returns a default null constraint.

pub fn validate( &self, data_type: &ConcreteDataType, is_nullable: bool, ) -> Result<()>

Check whether the constraint is valid for columns with given data_type and is_nullable attributes.

pub fn create_default_vector( &self, data_type: &ConcreteDataType, is_nullable: bool, num_rows: usize, ) -> Result<VectorRef>

Create a vector that contains num_rows default values for given data_type.

If is_nullable is true, then this method would returns error if the created default value is null.

Panics

Panics if num_rows == 0.

pub fn create_default( &self, data_type: &ConcreteDataType, is_nullable: bool, ) -> Result<Value>

Create a default value for given data_type.

If is_nullable is true, then this method would returns error if the created default value is null.

pub fn cast_to_datatype(&self, data_type: &ConcreteDataType) -> Result<Self>

Cast default value to given type

pub fn create_impure_default_vector( &self, data_type: &ConcreteDataType, num_rows: usize, ) -> Result<Option<VectorRef>>

Only create default vector if it’s impure, i.e., it’s a function.

This helps to delay creating constant default values to mito engine while also keeps impure default have consistent values

pub fn create_impure_default( &self, data_type: &ConcreteDataType, ) -> Result<Option<Value>>

Only create default value if it’s impure, i.e., it’s a function.

This helps to delay creating constant default values to mito engine while also keeps impure default have consistent values

fn maybe_null(&self) -> bool

Returns true if this constraint might creates NULL.

pub fn is_function(&self) -> bool

Returns true if this constraint is a function.

Trait Implementations

impl Clone for ColumnDefaultConstraint

fn clone(&self) -> ColumnDefaultConstraint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDefaultConstraint

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ColumnDefaultConstraint

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ColumnDefaultConstraint

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

Formats the value using the given formatter.

impl PartialEq for ColumnDefaultConstraint

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for ColumnDefaultConstraint

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<&[u8]> for ColumnDefaultConstraint

type Error = Error

The type returned in the event of a conversion error.

fn try_from(bytes: &[u8]) -> Result<Self>

Performs the conversion.

impl TryFrom<&ColumnDefaultConstraint> for Vec<u8>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: &ColumnDefaultConstraint) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<ColumnDefaultConstraint> for Vec<u8>

type Error = Error

The type returned in the event of a conversion error.

fn try_from(value: ColumnDefaultConstraint) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for ColumnDefaultConstraint

impl StructuralPartialEq for ColumnDefaultConstraint