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Formula¶

The formula transform uses an expression to calculate and add a new field to the data.

Parameters¶

expr Required: An expression string
as Required: The (new) field where the computed value is written to
inplace: Modify the rows in place (a temporary hack). Will be removed.; Default: false

Given the following data:

x	y
1	2
3	4

... and configuration:

{
  "type": "formula",
  "expr": "datum.x + datum.y",
  "as": "z"
}

A new field is added:

x	y	z
1	2	3
3	4	7