Module scalar_fn 

Scalar function vtable machinery.

This module contains the ScalarFnVTable trait and all built-in scalar function implementations. Expressions (crate::expr::Expression) reference scalar functions at each node.

Modules

fns

session

Structs

EmptyOptions

ScalarFn

A typed scalar function instance, parameterized by a concrete ScalarFnVTable.

ScalarFnOptions

An opaque handle to expression options.

ScalarFnRef

A type-erased scalar function, pairing a vtable with bound options behind a trait object.

ScalarFnSignature

Information about the signature of an expression.

VecExecutionArgs

A concrete ExecutionArgs backed by a Vec<ArrayRef>.

Enums

Arity

The arity (number of arguments) of a function.

Traits

ExecutionArgs

Arguments for expression execution.

ReduceCtx

Arguments for reduction rules.

ReduceNode

A node used for implementing abstract reduction rules.

ScalarFnPlugin

Registry trait for ID-based deserialization of scalar functions.

ScalarFnVTable

This trait defines the interface for scalar function vtables, including methods for serialization, deserialization, validation, child naming, return type computation, and evaluation.

ScalarFnVTableExt

Factory functions for vtables.

SimplifyCtx

Context for simplification.

Type Aliases

ChildName

A reference to the name of a child expression.

ReduceNodeRef

ScalarFnId

A unique identifier for a scalar function.

ScalarFnPluginRef

Reference-counted pointer to a scalar function plugin.