last_not_null(value: storable, [order_by(...)]?) -> value

Return the last non-null value of one column across an ordered group.

If no ordering is specified, the default ordering is that of the invoking verb, which is generally the 'valid_from' timestamp, ascending. In this case, the last value is the latest.

Domain

This is an aggregate function (aggregates rows over a group in aggregate verbs).

This is a window function (calculates over a group of multiple input rows using windowing).

Categories

• Aggregate
• Window

Examples

Find out the last non-null within each kind.

Find out the last non-null customer within each category.

Find out the non-null customer that logged in last within each category.