cum_sum¶

ColExpr.cum_sum( *, partition_by: Col | ColName | str | Iterable[Col | ColName | str] | None = None, arrange: ColExpr | Iterable[ColExpr], ) → ColExpr[Int][source]¶

ColExpr.cum_sum( *, partition_by: Col | ColName | str | Iterable[Col | ColName | str] | None = None, arrange: ColExpr | Iterable[ColExpr], ) → ColExpr[Float]

The sum of all preceding elements and the current element.

Null values are assigned the sum of all preceding elements.