pub trait IndexAccessor {
// Required method
fn index(self, key: Expr) -> Expr;
}Available on crate feature
nested_expressions only.Expand description
Return access to the element field. Example expr["name"]
§Example Access element 2 from column “c1”
For example if column “c1” holds documents like this
[10, 20, 30, 40]You can access the value “30” with
let expr = col("c1")
.index(lit(3));
assert_eq!(expr.schema_name().to_string(), "c1[Int32(3)]");