// retoor <retoor@molodetz.nl>
import "dataset" for Dataset
var ds = Dataset.memory()
var users = ds["users"]
users.insert({"name": "Alice", "email": "alice@example.com"})
users.insert({"name": "Bob", "email": null})
users.insert({"name": "Charlie"})
var withEmail = users.find({"email__null": false})
System.print(withEmail.count) // expect: 1
System.print(withEmail[0]["name"]) // expect: Alice
var withoutEmail = users.find({"email__null": true})
System.print(withoutEmail.count) // expect: 2
var all = users.all()
System.print(all.count) // expect: 3
ds.close()