Streamable.Unpivot<TKey,TInput,TPivotKey,TValue,TResult> Method
Definition
Important
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Rotates a stream of payload objects into a stream of key-attribute-value triples corresponding to the data from the input payloads.
public static Microsoft.StreamProcessing.IStreamable<TKey,TResult> Unpivot<TKey,TInput,TPivotKey,TValue,TResult> (this Microsoft.StreamProcessing.IStreamable<TKey,TInput> inputStreamable, System.Linq.Expressions.Expression<Func<TResult>> initializer, System.Linq.Expressions.Expression<Func<TInput,TPivotKey>> keySelector, System.Linq.Expressions.Expression<Func<TResult,string>> attributeSelector, System.Linq.Expressions.Expression<Func<TResult,TValue>> valueSelector) where TResult : new();static member Unpivot : Microsoft.StreamProcessing.IStreamable<'Key, 'Input> * System.Linq.Expressions.Expression<Func<'Result>> * System.Linq.Expressions.Expression<Func<'Input, 'PivotKey>> * System.Linq.Expressions.Expression<Func<'Result, string>> * System.Linq.Expressions.Expression<Func<'Result, 'Value>> -> Microsoft.StreamProcessing.IStreamable<'Key, 'Result (requires 'Result : (new : unit -> 'Result))> (requires 'Result : (new : unit -> 'Result))<Extension()>
Public Function Unpivot(Of TKey, TInput, TPivotKey, TValue, TResult) (inputStreamable As IStreamable(Of TKey, TInput), initializer As Expression(Of Func(Of TResult)), keySelector As Expression(Of Func(Of TInput, TPivotKey)), attributeSelector As Expression(Of Func(Of TResult, String)), valueSelector As Expression(Of Func(Of TResult, TValue))) As IStreamable(Of TKey, TResult)Type Parameters
- TKey
The type of the grouping key of the input streamable.
- TInput
The type of the payload of the input streamable.
- TPivotKey
The type of the unpivot key.
- TValue
The type of the value component of the unpivot operation.
- TResult
The type of the result.
Parameters
- inputStreamable
- IStreamable<TKey,TInput>
The source streamable to unpivot.
- initializer
- Expression<Func<TResult>>
A constructor describing how to create output values.
- keySelector
- Expression<Func<TInput,TPivotKey>>
A selector function returning the unpivot key.
- attributeSelector
- Expression<Func<TResult,String>>
A selector function stating what field in the return type holds desired unpivoted attributes.
- valueSelector
- Expression<Func<TResult,TValue>>
A selector function stating what field in the return type holds desired unpivoted values.
Returns
A stream of key-attribute-value triples corresponding to the original data stream.