protected override bool CanGenerateColumnar()
{
var typeOfTKey = typeof(TKey);
var typeOfTSource = typeof(TPayload);
var typeOfTResult = typeof(TResult);
if (!typeOfTSource.CanRepresentAsColumnar())
{
return(false);
}
if (!typeOfTResult.CanRepresentAsColumnar())
{
return(false);
}
if (typeOfTKey.GetPartitionType() != null)
{
return(false);
}
var lookupKey = CacheKey.Create(this.Selector.ExpressionToCSharp(), this.HasStartEdge, this.HasKey);
var generatedPipeType = cachedPipes.GetOrAdd(lookupKey, key => SelectTemplate.Generate(this));
this.errorMessages = generatedPipeType.Item2;
return(generatedPipeType.Item1 != null);
}
private UnaryPipe <TKey, TPayload, TResult> GetPipe(IStreamObserver <TKey, TResult> observer)
{
var lookupKey = CacheKey.Create(this.Selector.ExpressionToCSharp(), this.HasStartEdge, this.HasKey);
var generatedPipeType = cachedPipes.GetOrAdd(lookupKey, key => SelectTemplate.Generate(this));
Func <PlanNode, IQueryObject, PlanNode> planNode = (PlanNode p, IQueryObject o) => new SelectPlanNode(p, o, typeof(TKey), typeof(TPayload), typeof(TResult), this.Selector, this.HasKey, this.HasStartEdge, true, generatedPipeType.Item2);
var instance = Activator.CreateInstance(generatedPipeType.Item1, this, observer, planNode);
var returnValue = (UnaryPipe <TKey, TPayload, TResult>)instance;
return(returnValue);
}