Functions.ApproxCountDistinct 方法

定义

命名空间:

Microsoft.Spark.Sql

程序集:

Microsoft.Spark.dll

包:

Microsoft.Spark v1.0.0

重载

ApproxCountDistinct(Column)	返回组中非重复项的近似数目。
ApproxCountDistinct(String)	返回组中非重复项的近似数目。
ApproxCountDistinct(Column, Double)	返回组中非重复项的近似数目。
ApproxCountDistinct(String, Double)	返回组中非重复项的近似数目。

ApproxCountDistinct(Column)

返回组中非重复项的近似数目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct (Microsoft.Spark.Sql.Column column);

static member ApproxCountDistinct : Microsoft.Spark.Sql.Column -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (column As Column) As Column

参数

column

Column

要应用的列

返回

Column

Column 对象

ApproxCountDistinct(String)

返回组中非重复项的近似数目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct (string columnName);

static member ApproxCountDistinct : string -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (columnName As String) As Column

参数

columnName

String

列名称

返回

Column

Column 对象

ApproxCountDistinct(Column, Double)

返回组中非重复项的近似数目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct (Microsoft.Spark.Sql.Column column, double rsd);

static member ApproxCountDistinct : Microsoft.Spark.Sql.Column * double -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (column As Column, rsd As Double) As Column

参数

column

Column

要应用的列

rsd

Double

允许的最大估计误差

返回

Column

Column 对象

ApproxCountDistinct(String, Double)

返回组中非重复项的近似数目。

public static Microsoft.Spark.Sql.Column ApproxCountDistinct (string columnName, double rsd);

static member ApproxCountDistinct : string * double -> Microsoft.Spark.Sql.Column

Public Shared Function ApproxCountDistinct (columnName As String, rsd As Double) As Column

参数

columnName

String

列名称

rsd

Double

允许的最大估计误差

返回

Column

Column 对象