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

DryadLinqQueryable Fork TSource, TKey Method (IQueryable TSource , Expression Func TSource, 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: 0.1.2.0 (0.1.2.0)

Syntax

C++

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

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)

<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
)

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.Linq IQueryable TSource
The input dataset

keySelector: Type: System.Linq.Expressions Expression Func TSource, 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: IKeyedMultiQueryable TSource, 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 IQueryable TSource . 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).