Erie Documentation
A filter transformation filters “IN” rows that meet a provided condition.
Filter properties
| Property | Type | Description |
|---|---|---|
filter |
ExprString |
A filter expression. |
Filter expression
Use datum to refer to each row item.
To access a field (say, cost), you can use datum.cost.
Filter expressions allow basic JavaScript expressions.
Usage pattern
JSON
{
...
"transform" : [
{
"filter": "datum.cost > 30",
},
]
...
}JavaScript
let stream = new Erie.Stream();
...
let filter = new Erie.Filter("datum.cost > 30"); // filter expression
// alt) let filter = new Erie.Filter(); filter.filter("datum.cost > 30");
stream.transform.add(filter);
...