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Expression as dimesion

Hi

i want to sort a table using different expression which is based on some other column.

Now i want to limit the Dimension. But it is not possible in Line Chart.

So i tried to put if(rank(expression)<11, Dimension)

But the problem is expression is always calculated over dimension. So the above thing returning Null value when used as Dimension. If i used the same in Expression as if(rank(expression)<11, Dimension) over the Dimension it is returning the correct top values.

Anything can be done to get the Top dimension using Expression without placing it over a dimension?

I explained my problem as simple as i can.

Any ideas ???

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Would you mind posting your solution?  I have a simular problem that i can't seem to make work.

Here is my expression

=aggr(if(rank(Total sum(CaseCnt)) < 4,HospitalShortName,'Other'),HospitalShortName)

I am using a line chart so i want the top 4 Hospital names and the remainder in an "Others" Catagory.