Module functions 

Expression Function Module

Provide the function definitions and implementations during the evaluation of expressions, including both built-in functions and custom functions.

Module Structure

• signature.rs - type signature system
• registry.rs - function registry
• builtin/ – Implementation of built-in functions
• custom.rs - custom function definitions
• table.rs - table function definitions

How to use it

use linkrs_core::value::Value;
use linkrs_query::executor::expression::functions::{BuiltinFunction, MathFunction};

let func = BuiltinFunction::Math(MathFunction::Abs);
let result = func.execute(&[Value::Int(-5)]).expect("abs should succeed");
assert_eq!(result, Value::Int(5));

Re-exports

pub use fulltext::FulltextExecutionContext;

pub use fulltext::FulltextFunction;

pub use builtin::vector::VectorFunction;

pub use builtin::sequence::SequenceFunction;

pub use registry::global_registry;

pub use registry::global_registry_ref;

pub use registry::FunctionRegistry;

pub use signature::ValueType;

pub use udf::SharedPlugin;

pub use udf::UdfError;

pub use udf::UdfPlugin;

pub use builtin::container::ContainerFunction;

pub use builtin::conversion::ConversionFunction;

pub use builtin::datetime::DateTimeFunction;

pub use builtin::geography::GeographyFunction;

pub use builtin::graph::GraphFunction;

pub use builtin::math::MathFunction;

pub use builtin::path::PathFunction;

pub use builtin::regex::RegexFunction;

pub use builtin::string::StringFunction;

pub use builtin::utility::UtilityFunction;

Modules

builtin

Module for implementing built-in functions

fulltext

Full-Text Search Expression Functions

registry

Function Registry

signature

Type Signature System

udf

Dynamic UDF support.

Structs

CFunctionContext

C Function Context Structure (Opaque Pointers)

CustomFunction

Custom function definition

Enums

BuiltinFunction

Built-in function types to avoid dynamic distribution.

BuiltinTableFunction

Built-in table function implementations.

CustomFunctionImpl

Implementation of custom functions and their types

FunctionRef

Function reference enumeration, used to reference functions in expressions

OwnedFunctionRef

A function reference that possesses ownership

Traits

ExpressionFunction

Expression function characteristics

TableFunction

Table function trait for functions that return rows of data.

Type Aliases

AggregateFinalCallback

Aggregate final callback type

AggregateStepCallback

Aggregation step callback type

ScalarFunctionCallback

Scalar function callback type