Trait MetadataExt

pub trait MetadataExt {
    type Error;

    // Required methods
    fn missing_key_error(&self, key: &str) -> Self::Error;
    fn get_opt(&self, key: &str) -> Option<&str>;

    // Provided methods
    fn get_or_err(&self, key: &str) -> Result<&str, Self::Error> { ... }
    fn get_bool(&self, key: &str) -> bool { ... }
}

Make it more ergonomic to work with arrow metadata.

Required Associated Types

type Error

Required Methods

fn missing_key_error(&self, key: &str) -> Self::Error

fn get_opt(&self, key: &str) -> Option<&str>

Provided Methods

fn get_or_err(&self, key: &str) -> Result<&str, Self::Error>

fn get_bool(&self, key: &str) -> bool

If the key exists and is NOT false.

Implementations on Foreign Types

impl MetadataExt for HashMap<String, String>

type Error = MissingMetadataKey

fn missing_key_error(&self, key: &str) -> Self::Error

fn get_opt(&self, key: &str) -> Option<&str>

impl MetadataExt for Field

type Error = MissingFieldMetadata

fn missing_key_error(&self, key: &str) -> Self::Error

fn get_opt(&self, key: &str) -> Option<&str>

Implementors