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

DryadLinqQueryableAssumeHashPartitionTSource, TKey Method (IQueryableTSource, ExpressionFuncTSource, TKey, IEqualityComparerTKey)

DryadLINQ documentation

Instructs DryadLINQ to assume that the dataset is hash partitioned.

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 IQueryable<TSource> AssumeHashPartition<TSource, TKey>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	IEqualityComparer<TKey> comparer
)

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

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

Parameters

source: Type: System.LinqIQueryableTSource
The input dataset
keySelector: Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
The function to extract the key from a record
comparer: Type: System.Collections.GenericIEqualityComparerTKey
An equality comparer to compute the hash code of a key

Type Parameters

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

Return Value

Type: IQueryableTSource
The same dataset as input

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

AssumeHashPartition Overload

Microsoft.Research.DryadLinq Namespace