Struct Expression 

pub struct Expression { /* private fields */ }

An owned, bound duckdb_expression (destroyed once on drop).

Implementations

impl Expression

pub fn return_type(&self) -> Option<LogicalType>

The expression’s return type, or None if DuckDB reports none.

pub fn is_foldable(&self) -> bool

Whether the expression can be folded into a constant value.

pub fn fold( &self, context: &ClientContext<'_>, ) -> Result<DuckValue, EngineError>

Folds a foldable expression into a scalar DuckValue using context.

Errors

Returns an EngineError if DuckDB reports a fold error, or if the folded value is of a type this scalar extractor does not cover.

Trait Implementations

impl Drop for Expression

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.