Struct tidb_query_expr::types::function::RpnFnMeta

[+] Show declaration

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>,
}

[−] Expand description

Metadata of an RPN function.

Fields

name: &'static str

[−] Expand description

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

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

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Validator against input expression tree.

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

[−] Expand description

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>

[−] Expand description

The RPN function.

Trait Implementations

impl Clone for RpnFnMeta[+]

[+] Show hidden undocumented items

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[+]

[+] Show hidden undocumented items

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

Formats the value using the given formatter.