Range partition a dataset. The list of range keys are determined dynamically at runtime.
Namespace: Microsoft.Research.DryadLinq
Assembly: Microsoft.Research.DryadLinq (in Microsoft.Research.DryadLinq.dll) Version: 0.2.1.0 (0.2.1.0)
Syntax
public static IQueryable<TSource> RangePartition<TSource, TKey>( this IQueryable<TSource> source, Expression<Func<TSource, TKey>> keySelector, IComparer<TKey> comparer, bool isDescending, int partitionCount )
Parameters
- source
- Type: System.LinqIQueryableTSource
The input dataset to be partitioned - keySelector
- Type: System.Linq.ExpressionsExpressionFuncTSource, TKey
The function to extract the key from a record - comparer
- Type: System.Collections.GenericIComparerTKey
An IComparer on TKey to compare keys - isDescending
- Type: SystemBoolean
true if the generated keys must be descending; otherwise ascending - partitionCount
- Type: SystemInt32
The number of partitions in the output dataset
Type Parameters
- TSource
- The type of the records in the input dataset
- TKey
- The type of the key on which the partition is based
Return Value
Type: IQueryableTSourceAn IQueryable partitioned according to a list of keys determined at runtime
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).See Also