DryadLinqQueryable.Fork(TSource, TKey) Method (IQueryable(TSource), Expression(Func(TSource, TKey)), TKey[])

DryadLinqQueryableForkTSource, TKey Method (IQueryableTSource, ExpressionFuncTSource, TKey, TKey)

DryadLINQ documentation

Divides the input dataset into a collection of datasets based on the keys of the records. The method produces one output dataset for each key in the specified key array. Input records that don't match any of the keys are dropped.

Namespace: Microsoft.Research.DryadLinq
Assembly: Microsoft.Research.DryadLinq (in Microsoft.Research.DryadLinq.dll) Version: 0.2.1.0 (0.2.1.0)

Syntax

C++

Copy

public static IKeyedMultiQueryable<TSource, TKey> Fork<TSource, TKey>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	TKey[] keys
)

<ExtensionAttribute> 
Public Shared Function Fork(Of TSource, TKey) ( 
	source As IQueryable(Of TSource),
	keySelector As Expression(Of Func(Of TSource, TKey)),
	keys As TKey()
) As IKeyedMultiQueryable(Of TSource, TKey)

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static IKeyedMultiQueryable<TSource, TKey>^ Fork(
	IQueryable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector, 
	array<TKey>^ keys
)

Parameters

source: Type: System.LinqIQueryableTSource
The input dataset
keySelector: Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
The function to extract the key from a record
keys: Type: TKey
A list of the partition keys

Type Parameters

TSource: The type of records of input dataset
TKey: The type of the keys of the input records

Return Value

Type: IKeyedMultiQueryableTSource, TKey
An IKeyedMultiQueryable for the output datasets.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryableTSource. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Reference

DryadLinqQueryable Class

Fork Overload

Microsoft.Research.DryadLinq Namespace