CumMax / Computation Layer

Calculate the running maximum of values in a column. Similar to pandas cummax() or running max in SQL.

For each position i: $y_{i} = j = 1 max i (x_{j})$

Applications:

Peak value tracking
High watermark analysis
Progressive maxima

Note: Ignores null values. Direction controlled by Reverse parameter.

Table

Transforms

[, ...]

Select

column

The column for cumulative maximum. Example with [1, 3, 2, 4]:

Forward: [1, 3, 3, 4]
Reverse: [4, 4, 4, 4]

Reverse

bool

false

Controls accumulation direction:

false: scan from top to bottom
true: scan 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.