Functions.ApproxCountDistinct Method
Definition
Important
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Overloads
| ApproxCountDistinct(Column) |
Returns the approximate number of distinct items in a group. |
| ApproxCountDistinct(String) |
Returns the approximate number of distinct items in a group. |
| ApproxCountDistinct(Column, Double) |
Returns the approximate number of distinct items in a group. |
| ApproxCountDistinct(String, Double) |
Returns the approximate number of distinct items in a group. |
ApproxCountDistinct(Column)
Returns the approximate number of distinct items in a group.
public static Microsoft.Spark.Sql.Column ApproxCountDistinct(Microsoft.Spark.Sql.Column column);static member ApproxCountDistinct : Microsoft.Spark.Sql.Column -> Microsoft.Spark.Sql.ColumnPublic Shared Function ApproxCountDistinct (column As Column) As ColumnParameters
- column
- Column
Column to apply
Returns
Column object
Applies to
ApproxCountDistinct(String)
Returns the approximate number of distinct items in a group.
public static Microsoft.Spark.Sql.Column ApproxCountDistinct(string columnName);static member ApproxCountDistinct : string -> Microsoft.Spark.Sql.ColumnPublic Shared Function ApproxCountDistinct (columnName As String) As ColumnParameters
- columnName
- String
Column name
Returns
Column object
Applies to
ApproxCountDistinct(Column, Double)
Returns the approximate number of distinct items in a group.
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.ColumnPublic Shared Function ApproxCountDistinct (column As Column, rsd As Double) As ColumnParameters
- column
- Column
Column to apply
- rsd
- Double
Maximum estimation error allowed
Returns
Column object
Applies to
ApproxCountDistinct(String, Double)
Returns the approximate number of distinct items in a group.
public static Microsoft.Spark.Sql.Column ApproxCountDistinct(string columnName, double rsd);static member ApproxCountDistinct : string * double -> Microsoft.Spark.Sql.ColumnPublic Shared Function ApproxCountDistinct (columnName As String, rsd As Double) As ColumnParameters
- columnName
- String
Column name
- rsd
- Double
Maximum estimation error allowed
Returns
Column object