public static PipelineDefinition<TInput, TOutput> GraphLookup<TInput, TIntermediate, TFrom, TConnectFrom, TConnectTo, TStartWith, TAs, TOutput>(
	this PipelineDefinition<TInput, TIntermediate> pipeline,
	IMongoCollection<TFrom> from,
	Expression<Func<TFrom, TConnectFrom>> connectFromField,
	Expression<Func<TFrom, TConnectTo>> connectToField,
	Expression<Func<TIntermediate, TStartWith>> startWith,
	Expression<Func<TOutput, TAs>> as,
	AggregateGraphLookupOptions<TFrom, TFrom, TOutput> options = null,
	ExpressionTranslationOptions translationOptions = null
)
where TAs : Object, IEnumerable<TFrom>

<ExtensionAttribute>
Public Shared Function GraphLookup(Of TInput, TIntermediate, TFrom, TConnectFrom, TConnectTo, TStartWith, TAs As {Object, IEnumerable(Of TFrom)}, TOutput) ( 
	pipeline As PipelineDefinition(Of TInput, TIntermediate),
	from As IMongoCollection(Of TFrom),
	connectFromField As Expression(Of Func(Of TFrom, TConnectFrom)),
	connectToField As Expression(Of Func(Of TFrom, TConnectTo)),
	startWith As Expression(Of Func(Of TIntermediate, TStartWith)),
	as As Expression(Of Func(Of TOutput, TAs)),
	Optional options As AggregateGraphLookupOptions(Of TFrom, TFrom, TOutput) = Nothing,
	Optional translationOptions As ExpressionTranslationOptions = Nothing
) As PipelineDefinition(Of TInput, TOutput)

[<ExtensionAttribute>]
static member GraphLookup : 
        pipeline : PipelineDefinition<'TInput, 'TIntermediate> * 
        from : IMongoCollection<'TFrom> * 
        connectFromField : Expression<Func<'TFrom, 'TConnectFrom>> * 
        connectToField : Expression<Func<'TFrom, 'TConnectTo>> * 
        startWith : Expression<Func<'TIntermediate, 'TStartWith>> * 
        as : Expression<Func<'TOutput, 'TAs>> * 
        ?options : AggregateGraphLookupOptions<'TFrom, 'TFrom, 'TOutput> * 
        ?translationOptions : ExpressionTranslationOptions 
(* Defaults:
        let _options = defaultArg options null
        let _translationOptions = defaultArg translationOptions null
*)
-> PipelineDefinition<'TInput, 'TOutput>  when 'TAs : Object and IEnumerable<'TFrom>