Struct polars_lazy::dsl::MetaNameSpace

pub struct MetaNameSpace(/* private fields */);
Expand description

Specialized expressions for Categorical dtypes.

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impl MetaNameSpace

pub fn pop(self) -> Vec<Expr>

Pop latest expression and return the input(s) of the popped expression.

pub fn root_names(&self) -> Vec<Arc<str>>

Get the root column names.

pub fn is_simple_projection(&self) -> bool

A projection that only takes a column or a column + alias.

pub fn output_name(&self) -> Result<Arc<str>, PolarsError>

Get the output name of this expression.

pub fn undo_aliases(self) -> Expr

Undo any renaming operation like alias, keep_name.

pub fn has_multiple_outputs(&self) -> bool

Indicate if this expression expands to multiple expressions.

pub fn is_column(&self) -> bool

Indicate if this expression is a basic (non-regex) column.

pub fn is_regex_projection(&self) -> bool

Indicate if this expression expands to multiple expressions with regex expansion.

pub fn _selector_add(self, other: Expr) -> Result<Expr, PolarsError>

pub fn _selector_sub(self, other: Expr) -> Result<Expr, PolarsError>

pub fn _selector_and(self, other: Expr) -> Result<Expr, PolarsError>

pub fn _into_selector(self) -> Expr

pub fn into_tree_formatter(self) -> Result<impl Display, PolarsError>

Get a hold to an implementor of the Display trait that will format as the expression as a tree

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const ALIGN: usize = _

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type Init = T

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unsafe fn init(init: <T as Pointable>::Init) -> usize

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