CumCount / Computation Layer

Calculate the running count of non-null values in a column. Similar to pandas cumcount() or running count in SQL.

For each position i: $y_{i} = j = 1 \sum i [x_{j} is not null]$

Applications:

Event occurrence tracking
Data completeness analysis
Sequential counting
Missing value patterns

Note: Counts only non-null values. Direction controlled by Reverse parameter.

Table

Transforms

[, ...]

Select

column

The column to count cumulatively. Example with [1, null, 2, 3]:

Forward: [1, 1, 2, 3]
Reverse: [3, 2, 1, 1]

Reverse

bool

false

Controls counting direction:

false: count from top to bottom
true: count from bottom to top

Name for the new column. If not provided, the system generates a unique name. If AsColumn matches an existing column, the existing column is replaced. The name should follow valid column naming conventions.