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

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

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: 0.2.1.0 (0.2.1.0)

Syntax

C++

Copy

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

<ExtensionAttribute> 
Public Shared Function HashPartition(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>^ HashPartition(
	IQueryable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector, 
	IEqualityComparer<TKey>^ comparer
)

Parameters

source: Type: System.LinqIQueryableTSource
The dataset to be partitioned
keySelector: Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
The function to extract the key from a record
comparer: Type: System.Collections.GenericIEqualityComparerTKey
An IComparer on TKey to compare keys

Type Parameters

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

Return Value

Type: IQueryableTSource
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 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

HashPartition Overload

Microsoft.Research.DryadLinq Namespace