Ecto.Query.WindowAPI.cume_dist
You're seeing just the function
cume_dist
, go back to Ecto.Query.WindowAPI module for more information.
Returns relative rank of the current row: (number of rows preceding or peer with current row) / (total rows).
from p in Post,
select: cume_dist() |> over(partition_by: p.category_id, order_by: p.date)
Note that this function must be invoked using window function syntax.