Struct InstrFunc 

pub struct InstrFunc;

Trait Implementations

impl ScalarFunction for InstrFunc

fn invoke(&self, args: &[SqliteValue]) -> Result<SqliteValue>

Execute this function on the given arguments.

fn num_args(&self) -> i32

The number of arguments this function accepts.

fn name(&self) -> &str

The function name, used in error messages and EXPLAIN output.

fn invoke_with_arg_subtypes( &self, args: &[SqliteValue], _arg_subtypes: &[u32], ) -> Result<SqliteValue>

Execute this function with knowledge of each argument’s value subtype (e.g. JSON_SUBTYPE for values returned by JSON functions).

fn consumes_argument_collation(&self) -> bool

Whether this function consumes the SQL collation selected from its arguments (for example built-in nullif, scalar min, and scalar max). Custom functions default to collation-opaque semantics.

fn invoke_with_collation( &self, args: &[SqliteValue], _collation: Option<&dyn CollationFunction>, ) -> Result<SqliteValue>

Invoke with the selected SQL collation, when this implementation advertises Self::consumes_argument_collation.

fn result_subtype(&self) -> Option<u32>

The subtype this function tags onto its result value, if any.

fn is_deterministic(&self) -> bool

Whether this function is deterministic (same inputs → same output).

fn min_args(&self) -> i32

Minimum accepted argument count for a variadic function.

fn max_args(&self) -> Option<i32>

Maximum accepted argument count for a variadic function.

fn arity(&self) -> FunctionArity

Return the complete SQL-visible arity contract in one metadata call.