public static Expression CallCount(GroupedStage groupedStage)
{
var groupedCountMethod = CountWildcardMethod.MakeGenericMethod(groupedStage.ValueType);
var call = Expression.Call(
instance: null,
method: groupedCountMethod,
arguments: new Expression[] { groupedStage.ParameterExpression });
return(call);
}
public static Expression CallSum(Expression expression, GroupedStage groupedStage)
{
var sumOutputType = GetSumOutputType(expression.Type);
if (!Equals(sumOutputType, expression.Type))
{
expression = Expression.Convert(expression, sumOutputType);
}
var sumMethod = GetSumMethod(sumOutputType);
return(CallMethod(expression, sumMethod, groupedStage));
}
public BaseAggregationVisitor(GroupedStage previousStage, VisitorMetadata visitorMetadata) : base(previousStage, visitorMetadata)
{
_previousStage = previousStage;
_visitorMetadata = visitorMetadata;
}
public OrderByAggregationsVisitor(GroupedStage previousStage, VisitorMetadata visitorMetadata) : base(previousStage, visitorMetadata)
{
}
public SelectAggregationVisitor(GroupedStage previousStage, VisitorMetadata visitorMetadata) : base(previousStage, visitorMetadata)
{
//NOP
}
public static Expression CallMethod(Expression expression, MethodInfo method, GroupedStage stage)
{
var groupedSumMethod = method.MakeGenericMethod(stage.ValueType);
var argumentLambda = Expression.Lambda(expression, stage.ValueParameterExpression);
var call = Expression.Call(
instance: null,
method: groupedSumMethod,
arguments: new Expression[] { stage.ParameterExpression, argumentLambda });
return(call);
}
public HavingVisitor(GroupedStage previousStage, VisitorMetadata visitorMetadata) : base(previousStage, visitorMetadata)
{
}