Struct Extensions 

pub struct Extensions {
    pub functions: HashMap<u32, String>,
    pub types: HashMap<u32, String>,
    pub type_variations: HashMap<u32, String>,
}

Substrait uses SimpleExtensions to define behavior of plans in addition to what’s supported directly by the protobuf definitions. That includes functions, but also provides support for custom types and variations for existing types. This structs facilitates the use of these extensions in DataFusion. TODO: DF doesn’t yet use extensions for type variations https://github.com/apache/datafusion/issues/11544 TODO: DF doesn’t yet provide valid extensionUris https://github.com/apache/datafusion/issues/11545

Fields

functions: HashMap<u32, String>

types: HashMap<u32, String>

type_variations: HashMap<u32, String>

Implementations

impl Extensions

pub fn register_function(&mut self, function_name: &str) -> u32

Registers a function and returns the anchor (reference) to it. If the function has already been registered, it returns the existing anchor. Function names are case-insensitive (converted to lowercase).

pub fn register_type(&mut self, type_name: &str) -> u32

Registers a type and returns the anchor (reference) to it. If the type has already been registered, it returns the existing anchor.

Trait Implementations

impl Debug for Extensions

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Extensions

fn default() -> Extensions

Returns the “default value” for a type.

impl From<Extensions> for Vec<SimpleExtensionDeclaration>

fn from(val: Extensions) -> Vec<SimpleExtensionDeclaration>

Converts to this type from the input type.

impl PartialEq for Extensions

fn eq(&self, other: &Extensions) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Extensions

impl TryFrom<&Vec<SimpleExtensionDeclaration>> for Extensions

type Error = DataFusionError

The type returned in the event of a conversion error.

fn try_from( value: &Vec<SimpleExtensionDeclaration>, ) -> Result<Extensions, DataFusionError>

Performs the conversion.