Module function 

The built-in function registry: names, arities, and identities.

Invariant: a function is recognised here or it does not exist. The binder resolves a name to one of these identities and refuses everything else with “no such function”, so an unknown name fails at prepare time rather than part-way through a scan, and the VM never dispatches on a string.

Arity is checked here too, because SQLite reports “wrong number of arguments to function abs()” from prepare rather than from execution.

Structs

ExternalFunction

A function an application registered, as the binder needs to see it.

FunctionEntry

One row of PRAGMA function_list.

FunctionFlags

What a registered function promises about itself.

Enums

AggregateFunc

An aggregate built-in.

CallSite

Which context a name is being resolved from.

JsonFunc

A JSON built-in.

MathFunc

A math built-in.

ScalarFunc

A scalar built-in.

TimeFunc

A date or time built-in.

WindowFunc

A window function that is not an aggregate.

Constants

DETERMINISTIC_FLAG

The bit function_list sets for a function that answers the same twice.

INNOCUOUS_FLAG

The bit function_list sets for a function a schema may safely call.

Functions

aggregate_arity_ok

Returns whether an argument count is legal for an aggregate.

every_function

Returns every built-in this build has, in the order function_list reports.

is_aggregate_call

Returns whether a folded name may be an aggregate at this argument count.

lookup_aggregate

Returns the aggregate a folded name spells.

lookup_external

Returns the registration that answers a call, preferring an exact arity.

lookup_json

Returns the JSON function a folded name spells.

lookup_math

Returns the math function a folded name spells.

lookup_scalar

Returns the scalar function a folded name spells.

lookup_time

Returns the date or time function a folded name spells.

lookup_window

Returns the window function a folded name spells.

minmax_aggregate

Returns the aggregate a min/max call resolves to at one argument.

needs_a_component

Returns what a name needs, when the name is one this build left out.

scalar_arity_ok

Returns whether an argument count is legal for a scalar function.

schema_refusal

Returns why a schema may not call this function, or nothing when it may.