Struct mz_repr::RelationDescBuilder

pub struct RelationDescBuilder {
    columns: Vec<(ColumnName, ColumnType)>,
    keys: Vec<Vec<usize>>,
}

A builder for a RelationDesc.

Fields

columns: Vec<(ColumnName, ColumnType)>

Columns of the relation.

keys: Vec<Vec<usize>>

Sets of indices that are “keys” for the collection.

Implementations

impl RelationDescBuilder

pub fn with_column<N: Into<ColumnName>>( self, name: N, ty: ColumnType, ) -> RelationDescBuilder

Appends a column with the specified name and type.

pub fn with_columns<I, T, N>(self, iter: I) -> Self

where I: IntoIterator<Item = (N, T)>, T: Into<ColumnType>, N: Into<ColumnName>,

Appends the provided columns to the builder.

pub fn with_key(self, indices: Vec<usize>) -> RelationDescBuilder

Adds a new key for the relation.

pub fn without_keys(self) -> RelationDescBuilder

Removes all previously inserted keys.

pub fn concat(self, other: Self) -> Self

Concatenates a RelationDescBuilder onto the end of this RelationDescBuilder.

pub fn finish(self) -> RelationDesc

Finish the builder, returning a RelationDesc.

Trait Implementations

impl Clone for RelationDescBuilder

fn clone(&self) -> RelationDescBuilder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RelationDescBuilder

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

Formats the value using the given formatter.

impl Default for RelationDescBuilder

fn default() -> RelationDescBuilder

Returns the “default value” for a type.

impl PartialEq for RelationDescBuilder

fn eq(&self, other: &RelationDescBuilder) -> 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 Eq for RelationDescBuilder

impl StructuralPartialEq for RelationDescBuilder