Function count_all_window

pub fn count_all_window() -> Expr

Creates window aggregation to count all rows.

In SQL this is SELECT COUNT(*) OVER (..) ...

The expression is equivalent to COUNT(*), COUNT(), COUNT(1)

Example

// create `count(*)` OVER ... window function expression
let expr = count_all_window();
assert_eq!(
  expr.schema_name().to_string(),
  "count(Int64(1)) ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING"
);
// if you need to refer to this column, use the `schema_name` function
let expr = col(expr.schema_name().to_string());