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parse_literal

datafusion_python::optimizer::simplify_expressions::simplify_literal

Function parse_literal 

Source 
pub fn parse_literal<T>(
    expr: &Expr,
) -> Result<<T as ArrowPrimitiveType>::Native, DataFusionError>
where
    T: ArrowPrimitiveType,
    <T as ArrowPrimitiveType>::Native: TryFrom<ScalarValue, Error = DataFusionError>,
Expand description

Parse and simplifies an expression to a numeric literal, corresponding to an arrow primitive type T (for example, Float64Type).

This function simplifies and coerces the expression, then extracts the underlying native type using TryFrom<ScalarValue>.

§Example

ⓘ
let value: f64 = parse_literal::<Float64Type>(expr)?;