Struct polars_plan::dsl::ListNameSpace

pub struct ListNameSpace(pub Expr);

Specialized expressions for Series of DataType::List.

Tuple Fields

0: Expr

Implementations

impl ListNameSpace

pub fn lengths(self) -> Expr

Get lengths of the arrays in the List type.

pub fn max(self) -> Expr

Compute the maximum of the items in every sublist.

pub fn min(self) -> Expr

Compute the minimum of the items in every sublist.

pub fn sum(self) -> Expr

Compute the sum the items in every sublist.

pub fn mean(self) -> Expr

Compute the mean of every sublist and return a Series of dtype Float64

pub fn sort(self, options: SortOptions) -> Expr

Sort every sublist.

pub fn reverse(self) -> Expr

Reverse every sublist

pub fn unique(self) -> Expr

Keep only the unique values in every sublist.

pub fn get(self, index: Expr) -> Expr

Get items in every sublist by index.

pub fn first(self) -> Expr

Get first item of every sublist.

pub fn last(self) -> Expr

Get last item of every sublist.

pub fn join(self, separator: &str) -> Expr

Join all string items in a sublist and place a separator between them.

Error

This errors if inner type of list != DataType::Utf8.

pub fn arg_min(self) -> Expr

Return the index of the minimal value of every sublist

pub fn arg_max(self) -> Expr

Return the index of the maximum value of every sublist

pub fn diff(self, n: usize, null_behavior: NullBehavior) -> Expr

Available on crate feature diff only.

Diff every sublist.

pub fn shift(self, periods: i64) -> Expr

Shift every sublist.

pub fn slice(self, offset: Expr, length: Expr) -> Expr

Slice every sublist.

pub fn head(self, n: Expr) -> Expr

Get the head of every sublist

pub fn tail(self, n: Expr) -> Expr

Get the tail of every sublist

pub fn to_struct(
    self,
    n_fields: ListToStructWidthStrategy,
    name_generator: Option<NameGenerator>
) -> Expr

Available on crate feature list_to_struct only.

Convert this List to a Series of type Struct. The width will be determined according to ListToStructWidthStrategy and the names of the fields determined by the given name_generator.

pub fn contains<E: Into<Expr>>(self, other: E) -> Expr

Available on crate feature is_in only.

Check if the list array contain an element