Erie Documentation

Erie supports several basic data transform operations. Transforms are exectued in the specified order. Depending on how it is configured, transforms may drop irrelevant fields/columns.

Supoorted transformation operations

Operation	Description	Shape changes
`aggregate`	One or more data aggregation operation.	Yes-Column/Row
`bin`	Binning a field	No
`filter`	Filter in data points	No
`calculate`	Compute a new field	No
`fold`	Convert columns to values	Yes-Column/Row
`density`	Compute a kernel density	Yes-Column/Row

API usage

JSON

{
  ...
  "transform" : [
    { ... },
    { ... },
  ]
  ...
}

JavaScript

let stream = new Erie.Stream();
...
stream.transform.add({ ... });
stream.transform.add({ ... });
...

For JavaScript API, you can also use stream.transform.remove(index) to remove a transform item by index.