In the following dataframe, I want to populate the column cum_max_sum using the columns minimum and to_add. How can I achieve this using Polars operations? ┌──────────────────┬─────────┬────────┬─────────────┐ │ prev_cum_max_sum ┆ minimum ┆ to_add ┆ cum_max_sum │ │ --- ┆ --- ┆ --- ┆ --- │ │ i64 ┆ i64 ┆ i64 ┆ i64 │ ╞══════════════════╪═════════╪════════╪═════════════╡ │ null ┆ 1 ┆ 5 ┆ 6 │ │ 6 ┆ 4 ┆ 6 ┆ 12 │ │ 12 ┆ 13 ┆ 7 ┆ 20 │ └──────────────────┴─────────┴────────┴─────────────┘ Explanation: max(null, 1) + 5 = 6 max(6, 4) + 6 = 12 max(12, 13) + 7 = 20 Continue reading...
