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. |
Usage
{"type": "extent", "field": "value", "signal": "extent"}
Computes a [min, max] array for the field value and makes it accessible as a signal named extent.