Struct datafusion::logical_expr::EmptyRelation

pub struct EmptyRelation {
    pub produce_one_row: bool,
    pub schema: Arc<DFSchema, Global>,
}

Produces no rows: An empty relation with an empty schema

Fields

produce_one_row: bool

Whether to produce a placeholder row

schema: Arc<DFSchema, Global>

The schema description of the output

Trait Implementations

impl Clone for EmptyRelation

fn clone(&self) -> EmptyRelation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Hash for EmptyRelation

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

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<EmptyRelation> for EmptyRelation

fn eq(&self, other: &EmptyRelation) -> 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 EmptyRelation

impl StructuralEq for EmptyRelation

impl StructuralPartialEq for EmptyRelation