Struct tidb_query_expr::types::function::RpnFnMeta

pub struct RpnFnMeta {
    pub name: &'static str,
    pub validator_ptr: fn(expr: &Expr) -> Result<()>,
    pub metadata_expr_ptr: fn(expr: &mut Expr) -> Result<Box<dyn Any + Send>>,
    pub fn_ptr: fn(ctx: &mut EvalContext, output_rows: usize, args: &[RpnStackNode<'_>], extra: &mut RpnFnCallExtra<'_>, metadata: &(dyn Any + Send)) -> Result<VectorValue>,
}

Metadata of an RPN function.

Fields

name: &'static str

The display name of the RPN function. Mainly used in tests.

validator_ptr: fn(expr: &Expr) -> Result<()>

Validator against input expression tree.

metadata_expr_ptr: fn(expr: &mut Expr) -> Result<Box<dyn Any + Send>>

The metadata constructor of the RPN function.

fn_ptr: fn(ctx: &mut EvalContext, output_rows: usize, args: &[RpnStackNode<'_>], extra: &mut RpnFnCallExtra<'_>, metadata: &(dyn Any + Send)) -> Result<VectorValue>

The RPN function.

Trait Implementations

impl Clone for RpnFnMeta

fn clone(&self) -> RpnFnMeta

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for RpnFnMeta

impl Debug for RpnFnMeta

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

Formats the value using the given formatter.