Module polars_plan::dsl

Domain specific language for the Lazy API.

Re-exports

• pub use udf::UserDefinedFunction;
• pub use crate::plans::lit;
• pub use cat::*;
  dtype-categorical
• pub use function_expr::*;
• pub use functions::*;

Modules

• binary
• catdtype-categorical
• dttemporal
• function_expr
• functions
  Functions
• python_udfpython
• stringstrings
• udf

Structs

• ArrayNameSpacedtype-array
  Specialized expressions for Series of DataType::Array.
• ChainedThen
  Utility struct for the when-then-otherwise expression.
• ChainedWhen
  Utility struct for the when-then-otherwise expression.
• ExprNameNameSpace
  Specialized expressions for modifying the name of existing expressions.
• FieldsMapper
• JoinOptions
• ListNameSpace
  Specialized expressions for Series of DataType::List.
• MetaNameSpacemeta
  Specialized expressions for Categorical dtypes.
• RollingCovOptions
• SpecialEq
  Wrapper type that has special equality properties depending on the inner type specialization
• StrptimeOptions
• StructNameSpacedtype-struct
  Specialized expressions for Struct dtypes.
• Then
  Utility struct for the when-then-otherwise expression.
• When
  Utility struct for the when-then-otherwise expression.

Enums

• AggExpr
• Excluded
• Expr
  Expressions that can be used in various contexts. Queries consist of multiple expressions. When using the polars lazy API, don’t construct an Expr directly; instead, create one using the functions in the polars_lazy::dsl module. See that module’s docs for more info.
• NestedType
• Operator
• WindowMapping
• WindowType

Traits

• BinaryUdfOutputField
• FunctionOutputField
• 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>

Functions

• apply_multiple
  Apply a function/closure over the groups of multiple columns. This should only be used in a group_by aggregation.
• binary_expr
  Compute op(l, r) (or equivalently l op r). l and r must have types compatible with the Operator.
• first
  First column in a DataFrame.
• last
  Last column in a DataFrame.
• len
  Return the number of rows in the context.
• 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.
• nth
  Nth column in a DataFrame.
• ternary_expr
• when
  Start a when-then-otherwise expression.

Type Aliases

• FieldsNameMapperdtype-struct
• GetOutput