Module polars_lazy::dsl[−][src]

Expand description

Domain specific language for the Lazy api.

Re-exports

pub use crate::frame::IntoLazy;

Structs

FunctionOptions

NoEq

Wrapper type that indicates that the inner type is not equal to anything

Null

The literal Null

When

Intermediate state of when(..).then(..).otherwise(..) expr.

WhenThen

Intermediate state of when(..).then(..).otherwise(..) expr.

WhenThenThen

Intermediate state of chain when then exprs.

Enums

AggExpr

Expr

Queries consists of multiple expressions.

Operator

Traits

A wrapper trait for any binary closure Fn(Series, Series) -> Result<Series>

SeriesUdf

A wrapper trait for any closure Fn(Vec<Series>) -> Result<Series>

Functions

all_exprs

Evaluate all the expressions with a bitwise and

any_exprs

Evaluate all the expressions with a bitwise or

avg

Find the mean of all the values in this Expression.

binary_expr

cast

Cast expression.

col

Create a Column Expression based on a column name.

count

Count the number of values in this Expression.

fold_exprs

Accumulate over multiple columns horizontally / row wise.

is_not_null

IsNotNull expression.

is_null

IsNull expression

lit

Create a Literal Expression from L

map_binary

Apply a closure on the two columns that are evaluated from Expr a and Expr b.

map_binary_lazy_field

Binary function where the output type is determined at runtime when the schema is known.

max

Find the maximum of all the values in this Expression.

max_exprs

Get the the minimum value per row

mean

Find the mean of all the values in this Expression.

median

Find the median of all the values in this Expression.

min

Find the minimum of all the values in this Expression.

min_exprs

Get the the minimum value per row

not

Not expression.

quantile

Find a specific quantile of all the values in this Expression.

range

Create a range literal.

sum

Sum all the values in this Expression.

sum_exprs

Get the the sum of the values per row

ternary_expr

when

Start a when-then-otherwise expression