Function sql::plan::typeconv::get_cast

fn get_cast(
    ecx: &ExprContext<'_>, 
    ccx: CastContext, 
    from: &ScalarType, 
    to: &ScalarType
) -> Option<Box<dyn FnOnce(HirScalarExpr) -> HirScalarExpr>>

Get casts directly between two ScalarTypes, with control over the allowed CastContext.