pl.cs (Column Selectors)

Namespace: Polars.FSharp

Column selectors.

Module Functions

pl.cs.all

Select all columns.

pl.cs.all : unit -> Selector

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pl.cs.alpha

Select all columns with alphabetic names.

pl.cs.alpha : asciiOnly: bool -> ignoreSpaces: bool -> Selector

Parameters

Name	Type	Description
asciiOnly	bool	-
ignoreSpaces	bool	-

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pl.cs.alphanumeric

Select all columns with alphanumeric names.

pl.cs.alphanumeric : asciiOnly: bool -> ignoreSpaces: bool -> Selector

Parameters

Name	Type	Description
asciiOnly	bool	-
ignoreSpaces	bool	-

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pl.cs.array

Select array columns. Optionally filter by inner data type and fixed width. Example: pl.cs.array (Some(pl.cs.numeric())) (Some 3L)

pl.cs.array : inner: Selector option -> width: int64 option -> Selector

Parameters

Name	Type	Description
inner	Selector option	-
width	int64 option	-

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pl.cs.arrayAll

Select all array columns.

pl.cs.arrayAll : unit -> Selector

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pl.cs.binary

Select binary columns.

pl.cs.binary : unit -> Selector

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pl.cs.boolean

Select boolean columns.

pl.cs.boolean : unit -> Selector

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pl.cs.byIndex

Select columns by their index with.

pl.cs.byIndex : indices: ReadOnlySpan<int64> -> Selector

Parameters

Name	Type	Description
indices	ReadOnlySpan<int64>	-

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pl.cs.byIndexStrict

Select columns by their index. Usage: cs.byIndex(0L, 2L, 4L)

pl.cs.byIndexStrict : indices: ReadOnlySpan<int64> -> Selector

Parameters

Name	Type	Description
indices	ReadOnlySpan<int64>	-

---

pl.cs.byName

Select a single column by name.

pl.cs.byName : names: seq<string> -> Selector

Parameters

Name	Type	Description
names	seq<string>	-

---

pl.cs.byNetType

Select columns by Generic Type. Usage: pl.cs.byType<int option>() or pl.cs.byType<DateTime>()

pl.cs.byNetType : unit -> Selector

---

pl.cs.byType

Select columns by DataType.

pl.cs.byType : dt: DataType -> Selector

Parameters

Name	Type	Description
dt	DataType	-

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pl.cs.cjkCols

[EN] Select columns whose names consist of CJK scripts, Unicode digits (\p{N}), and optionally ASCII/full-width Latin letters.

[ZH] 选择列名由中日韩字符、数字（\p{N}，含全/半角）以及可选英文字母（全/半角）组成的列。

[JA] 列名がCJK文字・数字（\p{N}、全角/半角）および英字（全角/半角）で構成される列を選択します。

[KO] 열 이름이 CJK 문자, 숫자(\p{N}, 전각/반각) 및 영문자(전각/반각)로 구성된 열을 선택합니다.

pl.cs.cjkCols : opts: CjkColumnOptions -> Selector

Parameters

Name	Type	Description
opts	CjkColumnOptions	-

---

pl.cs.contains

Select columns containing a pattern.

pl.cs.contains : pattern: string -> Selector

Parameters

Name	Type	Description
pattern	string	-

---

pl.cs.date

Select date columns.

pl.cs.date : unit -> Selector

---

pl.cs.datetime

Select all datetime columns (both with and without timezones).

pl.cs.datetime : timeUnit: TimeUnit -> Selector

Parameters

Name	Type	Description
timeUnit	TimeUnit	-

---

pl.cs.datetimeAware

Select ONLY timezone-aware datetime columns (any timezone).

pl.cs.datetimeAware : timeUnit: TimeUnit -> Selector

Parameters

Name	Type	Description
timeUnit	TimeUnit	-

---

pl.cs.datetimeExact

Select datetime columns matching a specific timezone (e.g., "UTC", "Asia/Shanghai").

pl.cs.datetimeExact : timeZone: string -> timeUnit: TimeUnit -> Selector

Parameters

Name	Type	Description
timeZone	string	-
timeUnit	TimeUnit	-

---

pl.cs.datetimeNaive

Select ONLY timezone-naive datetime columns (no timezone set).

pl.cs.datetimeNaive : timeUnit: TimeUnit -> Selector

Parameters

Name	Type	Description
timeUnit	TimeUnit	-

---

pl.cs.decimal

Select decimal columns.

pl.cs.decimal : unit -> Selector

---

pl.cs.duration

Select all duration columns. Optionally match a specific TimeUnit.

pl.cs.duration : timeUnit: TimeUnit -> Selector

Parameters

Name	Type	Description
timeUnit	TimeUnit	-

---

pl.cs.empty

Select empty columns.

pl.cs.empty : unit -> Selector

---

pl.cs.endsWith

Select columns ending with a pattern.

pl.cs.endsWith : pattern: string -> Selector

Parameters

Name	Type	Description
pattern	string	-

---

pl.cs.enum

Select enum columns.

pl.cs.enum : unit -> Selector

---

pl.cs.exclude

Select all columns EXCEPT the specified Selectors.

pl.cs.exclude : selectors: seq<Selector> -> Selector

Parameters

Name	Type	Description
selectors	seq<Selector>	-

---

pl.cs.excludeDataType

Select all columns EXCEPT the specified Data Types.

pl.cs.excludeDataType : dtypes: seq<DataType> -> Selector

Parameters

Name	Type	Description
dtypes	seq<DataType>	-

---

pl.cs.expandDf

Expand a Selector against a DataFrame to get the matched column names.

pl.cs.expandDf : selector: IColumnExpr -> target: DataFrame -> string[]

Parameters

Name	Type	Description
selector	IColumnExpr	-
target	DataFrame	-

---

pl.cs.expandLf

Expand a Selector against a LazyFrame to get the matched column names.

pl.cs.expandLf : selector: IColumnExpr -> target: LazyFrame -> string[]

Parameters

Name	Type	Description
selector	IColumnExpr	-
target	LazyFrame	-

---

pl.cs.first

Select the first column.

pl.cs.first : unit -> Selector

---

pl.cs.float

Select float columns.

pl.cs.float : unit -> Selector

---

pl.cs.integer

Select integer columns.

pl.cs.integer : unit -> Selector

---

pl.cs.last

Select the last column.

pl.cs.last : unit -> Selector

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pl.cs.list

Select list columns. Optionally filter by the inner data type. Example: pl.cs.list(Some(pl.cs.numeric()))

pl.cs.list : inner: Selector option -> Selector

Parameters

Name	Type	Description
inner	Selector option	-

---

pl.cs.listAll

Select all list columns.

pl.cs.listAll : unit -> Selector

---

pl.cs.matches

Select columns matching a regex pattern.

pl.cs.matches : regex: string -> Selector

Parameters

Name	Type	Description
regex	string	-

---

pl.cs.nested

Select nested columns.

pl.cs.nested : unit -> Selector

---

pl.cs.numeric

Select numeric columns (Int, Float, Decimal).

pl.cs.numeric : unit -> Selector

---

pl.cs.signedInteger

Select signed integer columns.

pl.cs.signedInteger : unit -> Selector

---

pl.cs.startsWith

Select columns starting with a pattern.

pl.cs.startsWith : pattern: string -> Selector

Parameters

Name	Type	Description
pattern	string	-

---

pl.cs.string

Select string columns.

pl.cs.string : unit -> Selector

---

pl.cs.structType

Select struct columns.

pl.cs.structType : unit -> Selector

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pl.cs.temporal

Select temporal columns.

pl.cs.temporal : unit -> Selector

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pl.cs.unsignedInteger

Select unsigned integer columns.

pl.cs.unsignedInteger : unit -> Selector

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