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<(), Error>

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<Arc<dyn Vector>, Error>

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, Error>

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.

Trait Implementations

impl Clone for ColumnDefaultConstraint

fn clone(&self) -> ColumnDefaultConstraint

Returns a copy 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<(), Error>

Formats the value using the given formatter.

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

fn deserialize<__D>( __deserializer: __D, ) -> Result<ColumnDefaultConstraint, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ColumnDefaultConstraint

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

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 as Serializer>::Ok, <__S as Serializer>::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<ColumnDefaultConstraint, 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<Vec<u8>, <Vec<u8> as TryFrom<ColumnDefaultConstraint>>::Error>

Performs the conversion.

impl Eq for ColumnDefaultConstraint

impl StructuralPartialEq for ColumnDefaultConstraint