Trait FieldAccessor

pub trait FieldAccessor {
    // Required method
    fn field(self, name: impl Literal) -> Expr;
}

Return access to the named field. Example expr["name"]

Access field “my_field” from column “c1”

For example if column “c1” holds documents like this

{
  "my_field": 123.34,
  "other_field": "Boston",
}

You can access column “my_field” with

let expr = col("c1")
   .field("my_field");
assert_eq!(expr.schema_name().to_string(), "c1[my_field]");

Required Methods

fn field(self, name: impl Literal) -> Expr

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl FieldAccessor for Expr

fn field(self, name: impl Literal) -> Expr

Implementors