Function union

datafusion/sql/tests/sql_integration.rs:2589–2603

()

#[test]
fn union() {
    let sql = "SELECT order_id from orders UNION SELECT order_id FROM orders";
    let plan = logical_plan(sql).unwrap();
    assert_snapshot!(
        plan,
        @r"
    Distinct:
      Union
        Projection: orders.order_id
          TableScan: orders
        Projection: orders.order_id
          TableScan: orders
    "
    );
}

#[test]
fn union_by_name_different_columns() {