Struct UdfContext

pub struct UdfContext {
    udf_param_context: HashMap<String, ExprImpl>,
    udf_global_counter: u32,
}

Fields

udf_param_context: HashMap<String, ExprImpl>

The mapping from sql udf parameters to a bound ExprImpl generated from ast expressions Note: The expressions are constructed during runtime, correspond to the actual users’ input

udf_global_counter: u32

The global counter that records the calling stack depth of the current binding sql udf chain

Implementations

impl UdfContext

pub fn new() -> Self

pub fn global_count(&self) -> u32

pub fn incr_global_count(&mut self)

pub fn decr_global_count(&mut self)

pub fn _is_empty(&self) -> bool

pub fn update_context(&mut self, context: HashMap<String, ExprImpl>)

pub fn _clear(&mut self)

pub fn get_expr(&self, name: &str) -> Option<&ExprImpl>

pub fn get_context(&self) -> HashMap<String, ExprImpl>

pub fn extract_udf_expression(ast: Vec<Statement>) -> Result<AstExpr, RwError>

A common utility function to extract sql udf expression out from the input ast

Trait Implementations

impl Clone for UdfContext

fn clone(&self) -> UdfContext

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for UdfContext

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

Formats the value using the given formatter.

impl Default for UdfContext

fn default() -> UdfContext

Returns the “default value” for a type.