DryadLinqQueryable.HashPartition(TSource, TKey, TResult) Method (IQueryable(TSource), Expression(Func(TSource, TKey)), IEqualityComparer(TKey), Expression(Func(TSource, TResult)))

DryadLinqQueryable HashPartition TSource, TKey, TResult Method (IQueryable TSource , Expression Func TSource, TKey , IEqualityComparer TKey , Expression Func TSource, TResult )

DryadLINQ documentation

Hash partition a dataset. The number of resulting partitions is dynamically determined at the runtime.

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 IQueryable<TResult> HashPartition<TSource, TKey, TResult>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	IEqualityComparer<TKey> comparer,
	Expression<Func<TSource, TResult>> resultSelector
)

public static IQueryable<TResult> HashPartition<TSource, TKey, TResult>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	IEqualityComparer<TKey> comparer,
	Expression<Func<TSource, TResult>> resultSelector
)

<ExtensionAttribute> 
Public Shared Function HashPartition(Of TSource, TKey, TResult) ( 
	source As IQueryable(Of TSource),
	keySelector As Expression(Of Func(Of TSource, TKey)),
	comparer As IEqualityComparer(Of TKey),
	resultSelector As Expression(Of Func(Of TSource, TResult))
) As IQueryable(Of TResult)

<ExtensionAttribute> 
Public Shared Function HashPartition(Of TSource, TKey, TResult) ( 
	source As IQueryable(Of TSource),
	keySelector As Expression(Of Func(Of TSource, TKey)),
	comparer As IEqualityComparer(Of TKey),
	resultSelector As Expression(Of Func(Of TSource, TResult))
) As IQueryable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey, typename TResult>
static IQueryable<TResult>^ HashPartition(
	IQueryable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector, 
	IEqualityComparer<TKey>^ comparer, 
	Expression<Func<TSource, TResult>^>^ resultSelector
)

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey, typename TResult>
static IQueryable<TResult>^ HashPartition(
	IQueryable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector, 
	IEqualityComparer<TKey>^ comparer, 
	Expression<Func<TSource, TResult>^>^ resultSelector
)

Parameters

source: Type: System.Linq IQueryable TSource
The dataset to be partitioned

keySelector: Type: System.Linq.Expressions Expression Func TSource, TKey
The function to extract the key from a record

comparer: Type: System.Collections.Generic IEqualityComparer TKey
An IComparer on TKey to compare keys

resultSelector: Type: System.Linq.Expressions Expression Func TSource, TResult
The function to compute output record

Type Parameters

TSource: The type of the records in the dataset
TKey: The type of the key on which the partition is based
TResult: The type of the records in the result dataset

Return Value

Type: IQueryable TResult
An IQueryable hash-partitioned according to a key

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).