Struct datafusion_common::Constraints

pub struct Constraints { /* private fields */ }

This object encapsulates a list of functional constraints:

Implementations

impl Constraints

pub fn empty() -> Self

Create empty constraints

pub fn new_from_table_constraints( constraints: &[TableConstraint], df_schema: &DFSchemaRef ) -> Result<Self>

Convert each TableConstraint to corresponding Constraint

pub fn is_empty(&self) -> bool

Check whether constraints is empty

Trait Implementations

impl Clone for Constraints

fn clone(&self) -> Constraints

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Constraints

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

Formats the value using the given formatter.

impl Display for Constraints

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

Formats the value using the given formatter.

impl Hash for Constraints

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<Constraints> for Constraints

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Eq for Constraints

impl StructuralEq for Constraints

impl StructuralPartialEq for Constraints