Calculate Transform

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The formula transform extends data objects with new fields (columns) according to a calculation formula.

  "transform": [
    {"calculate": ..., "as" ...} // Calculate Transform
Property Type Description
calculate String

Required. A string containing a Vega Expression. Use the variable datum to refer to the current data object.

as String

Required. The field for storing the computed formula value.


This example use calculate to derive a new field, then filter data based on the new field.