Module polars_lazy::dsl

Domain specific language for the Lazy api.

Re-exports

pub use functions::*;

Modules

binarydtype-binary

catdtype-categorical

functions

Functions

stringstrings

Structs

CategoricalNameSpace

Specialized expressions for Categorical dtypes.

DatetimeArgs

DurationArgs

JoinOptions

ListNameSpace

Specialized expressions for Series of DataType::List.

SpecialEq

Wrapper type that has special equality properties depending on the inner type specialization

StrpTimeOptions

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

CategoricalOrdering

Excluded

Expr

Queries consists of multiple expressions.

FunctionExpr

Operator

Traits

BinaryUdfOutputField

ExprEvalExtensioncumulative_eval

FunctionOutputField

IntoListNameSpace

ListNameSpaceExtension

Range

RenameAliasFn

SeriesBinaryUdf

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

SeriesUdf

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

UdfSchema

Functions

all

Selects all columns

all_exprs

Evaluate all the expressions with a bitwise and

any_exprs

Evaluate all the expressions with a bitwise or

apply_binary

apply_multiple

Apply a function/closure over the groups of multiple columns. This should only be used in a groupby aggregation.

arangearange

Create list entries that are range arrays

arg_wherearg_where

Get the indices where condition evaluates true.

argsort_by

Find the indexes that would sort these series in order of appearance. That means that the first Series will be used to determine the ordering until duplicates are found. Once duplicates are found, the next Series will be used and so on.

as_structdtype-struct

Take several expressions and collect them into a StructChunked.

avg

Find the mean of all the values in this Expression.

binary_expr

cast

Cast expression.

coalesce

Folds the expressions from left to right keeping the first no null values.

col

Create a Column Expression based on a column name.

cols

Select multiple columns by name

concat_lst

Concat lists entries.

concat_strconcat_str and strings

Horizontally concat string columns in linear time

count

Count expression

cov

Compute the covariance between two columns.

cumfold_exprsdtype-struct

Accumulate over multiple columns horizontally / row wise.

cumreduce_exprsdtype-struct

Accumulate over multiple columns horizontally / row wise.

datetimetemporal

dtype_col

Select multiple columns by dtype.

dtype_cols

Select multiple columns by dtype.

durationtemporal

first

First column in DataFrame

fold_exprs

Accumulate over multiple columns horizontally / row wise.

format_strconcat_str and strings

Format the results of an array of expressions using a format string

is_not_null

IsNotNull expression.

is_null

IsNull expression

last

Last column in DataFrame

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_list_multiple

Apply a function/closure over multiple columns once the logical plan get executed.

map_multiple

Apply a function/closure over multiple columns once the logical plan get executed.

max

Find the maximum of all the values in this Expression.

max_exprs

Get the the maximum 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

not

Not expression.

pearson_corr

Compute the pearson correlation between two columns.

quantile

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

range

Create a range literal.

reduce_exprs

repeat

Repeat a literal value n times.

spearman_rank_corrrank and propagate_nans

Compute the spearman rank correlation between two columns. Missing data will be excluded from the computation.

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

Type Definitions

GetOutput