Extent Transform

The extent transform computes the minimum and maximum values for a data field, producing a [min, max] array. This transform is useful for computing a value range and binding it to a signal name, for example to use as a parameter for a bin transform. This transform does not change the input data stream, it only computes the extent as a side effect.

Transform Parameters

Property Type Description
field Field Required. The data field for which to compute the extent.
signal String If defined, binds the computed extent array to a signal with the given name.


{"type": "extent", "field": "value", "signal": "extent"}

Computes a [min, max] array for the field value and makes it accessible as a signal named extent.