Ecto.Query.WindowAPI.rank
You're seeing just the function
rank
, go back to Ecto.Query.WindowAPI module for more information.
Returns rank of the current row with gaps; same as row_number/0
of its first peer.
from p in Post,
select: rank() |> over(partition_by: p.category_id, order_by: p.date)
Note that this function must be invoked using window function syntax.