Struct DatasetsColumnUsage 

pub struct DatasetsColumnUsage {
    pub usages: HashMap<ScopedVariable, ColumnUsage>,
    pub aliases: HashMap<ScopedVariable, ScopedVariable>,
}

Struct that tracks the usage of all columns across a collection of datasets

Fields

usages: HashMap<ScopedVariable, ColumnUsage>

aliases: HashMap<ScopedVariable, ScopedVariable>

Implementations

impl DatasetsColumnUsage

pub fn empty() -> Self

pub fn with_column_usage( &self, datum_var: &ScopedVariable, usage: ColumnUsage, ) -> Self

pub fn with_unknown_usage(&self, datum_var: &ScopedVariable) -> Self

pub fn without_column_usage( &self, datum_var: &ScopedVariable, usage: &ColumnUsage, ) -> Self

pub fn with_alias(&self, from: ScopedVariable, to: ScopedVariable) -> Self

pub fn union(&self, other: &DatasetsColumnUsage) -> DatasetsColumnUsage

Take the union of two DatasetColumnUsage instances.

Trait Implementations

impl Clone for DatasetsColumnUsage

fn clone(&self) -> DatasetsColumnUsage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DatasetsColumnUsage

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

Formats the value using the given formatter.

impl PartialEq for DatasetsColumnUsage

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

impl StructuralPartialEq for DatasetsColumnUsage