Arithmetic Functions

4 functions for basic arithmetic against a second operand. The source column is always the implicit first input.

Function	Syntax	Parameters	Notes
`add`	`add(column, operand)`	`operand` — column, literal, or expression.
`subtract`	`subtract(column, operand)`	`operand` — column, literal, or expression.
`multiply`	`multiply(column, operand)`	`operand` — column, literal, or expression.
`divide`	`divide(column, operand)`	`operand` — column, literal, or expression.	Guards against division by zero using `F.nullif(operand, 0)` — returns null instead of raising an error.